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Subject: Geography

  • What is Post-Disaster Needs Assessment (PDNA)?

    pdna

    Post-Disaster Needs Assessment (PDNA) is now being done simultaneously in Assam, Himachal Pradesh, Gujarat, Karnataka, Jharkhand, Maharashtra, Odisha and Meghalaya.

    Why in news?

    • PDNA is now being used to evaluate the financial and social cost of local disasters in eight states in India.
    • These states all experienced severe flooding in the last few months.
    • The results of these assessments are likely to come out next month.

    What is PDNA?

    • PDNA is an internationally accepted methodology for determining the physical damages, economic losses, and costs of meeting recovery needs after a natural disaster through a government-led process.
    • It is an international framework for assessing losses and damages in the aftermath of a disaster.
    • The framework helps get recovery and reconstruction efforts right following a disaster.
    • Globally, of the 55 PDNAs conducted worldwide since 2008, only two droughts — one in Malawi and the other Marshall Islands in 2016 — were of slow-onset disasters.

    Components of PDNA

    • PDNA includes a calculation of the disaster’s impact on Gross Domestic Product, the balance of payment and fiscal budget.
    • Secondly, how this affects the flow of revenue to multiple sectors is evaluated.
    • For example, the number of farmers’ income affected per damaged acre of land and the livelihoods lost.
    • Overall, a quantitative assessment is additionally done on the social and environmental impact of the disaster.

    History of PDNA in India

    • This is not the first time PDNA has been conducted in India.
    • It was first adopted during the Kerala floods of 2018 and again during the cyclone in Odisha in 2019, both unprecedented disasters.
    • Until now, the assessment was only limited to massive disasters that required international funding from the World Bank, the Asian Development Bank and the United Nations.

    15th Finance Commission provision

    • The 15th finance commission report of 2021, for the first time, made a provision for recovery and reconstruction in the national disaster management budget, which is at the core of the PDNA.
    • The states did not receive international funding to do the current ongoing PDNAs, as they are expected to take the money from the budget.

     

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  • What are Eclipses?

    eclipse

    India recently witnessed a partial solar eclipse. Let’s take a look over all dynamics of Eclipses.

    What are Eclipses?

    • An eclipse takes place when one heavenly body such as a moon or planet moves into the shadow of another heavenly body.
    • There are two types of eclipses on Earth: an eclipse of the Moon and an eclipse of the Sun.

    [I] A Lunar Eclipse

    eclipse

    • The moon moves in an orbit around Earth, and at the same time, Earth orbits the sun. Sometimes Earth moves between the sun and the moon.
    • When this happens, Earth blocks the sunlight that normally is reflected by the moon. (This sunlight is what causes the moon to shine.)
    • Instead of light hitting the moon’s surface, Earth’s shadow falls on it. This is an eclipse of the moon — a lunar eclipse.
    • A lunar eclipse can occur only when the moon is full. (But not every full moon is also a lunar eclipse. Can you guess why?)

    Observing a Lunar Eclipse

    • A lunar eclipse can be seen from Earth at night.
    • A lunar eclipse usually lasts for a few hours.
    • At least two partial lunar eclipses happen every year, but total lunar eclipses are rare.

    There are two types of lunar eclipses: total lunar eclipses and partial lunar eclipses.

    • A total lunar eclipse occurs when the moon and the sun are on exact opposite sides of Earth. Although the moon is in Earth’s shadow, some sunlight reaches the moon.  The sunlight passes through Earth’s atmosphere, which causes Earth’s atmosphere to filter out most of the blue light. This makes the moon appear red to people on Earth.
    • A partial lunar eclipse happens when only a part of the moon enters Earth’s shadow. In a partial eclipse, Earth’s shadow appears very dark on the side of the moon facing Earth. What people see from Earth during a partial lunar eclipse depends on how the sun, Earth and moon are lined up.
    • In a penumbral lunar eclipse, only the more diffuse outer shadow of Earth – the penumbra – falls on the moon’s face. This third kind of lunar eclipse is much more subtle, and much more difficult to observe than either a total or partial eclipse of the moon.

    [II] A Solar Eclipse

    eclipse

    • Sometimes when the moon orbits Earth, it moves between the sun and Earth.
    • When this happens, the moon blocks the light of the sun from reaching Earth.
    • This causes an eclipse of the sun or solar eclipse.
    • During a solar eclipse, the moon casts a shadow onto Earth.

    There are three types of solar eclipses.

    The first is a Total Solar Eclipse

    • A total solar eclipse is only visible from a small area on Earth.
    • The people who see the total eclipse are in the centre of the moon’s shadow when it hits Earth.
    • The sky becomes very dark as if it were night. For a total eclipse to take place, the sun, moon and Earth must be in a direct line.

    The second type is a Partial Solar Eclipse

    • This happens when the sun, moon and Earth are not exactly lined up.
    • The sun appears to have a dark shadow on only a small part of its surface.

    The third type is an Annular Solar Eclipse

    • An annular eclipse happens when the moon is farthest from Earth. Because the moon is farther away from Earth, it seems smaller. It does not block the entire view of the sun. The moon in front of the sun looks like a dark disk on top of a larger sun-coloured disk. This creates what looks like a ring around the moon.
    • During a solar eclipse, the moon casts two shadows on Earth. The first shadow is called the Umbra. This shadow gets smaller as it reaches Earth. It is the dark centre of the moon’s shadow.
    • The second shadow is called the Penumbra. The penumbra gets larger as it reaches Earth. People standing in the penumbra will see a partial eclipse. People standing in the umbra will see a total eclipse.

    Observing a Solar Eclipse

    • Solar eclipses happen once every 18 months.
    • Unlike lunar eclipses, solar eclipses only last for a few minutes.

    Why don’t solar eclipses happen at every New Moon?

    • The reason is that the Moon’s orbit tilts 5° to Earth’s orbit around the Sun.
    • Astronomers call the two intersections of these paths nodes.
    • Eclipses only occur when the Sun lies at one node and the Moon is at its New (for solar eclipses) or Full (for lunar eclipses) phase.
    • During most (lunar) months, the Sun lies either above or below one of the nodes, and no eclipse happens.

    [III] Planet Transits

    • When a planet comes between Earth and the Sun, it is called a transit.
    • The only 2 planets that can be seen transiting the Sun from Earth are Venus and Mercury because they are the only planets that orbit inside Earth’s orbit.
    • From 2000–2199, there will be 14 transits of Mercury.
    • However, Venus transits are even rarer with only 2 this century, in 2004 and 2012.

     

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  • Urban Challenge, Problems and Solutions

    Context

    • After flooding of major metropolitan cities of Bengaluru, Gurgaon and Delhi following heavy rainfall, the Centre has pointed to two cities – Davanagere and Agartala – as successful examples of cities that have curbed urban flooding.

    Why cities are  so important in India?

    • Drivers of Growth: Urbanisation has played and will continue to play a critical role in India’s growth story in the 21st century.
    • Cities are seen as GDP multipliers: By some estimates, Indian cities already contribute up to 70% of the country’s GDP. Yet, depending on which official estimates you use, India is just 26% or 31% urban. But there is growing evidence that India is more urban than is officially recognized.
    • Cities have more productivity: Well-functioning and diverse cities allow for the sharing and cross-pollination of ideas, which in turn drive greater productivity.

    Urban

    What are the Urban challenges?

    • Lack of Planning: current urban planning policies and practice have led to suboptimal use of land in Indian cities. This has multiple consequences. There is not enough floor space for accommodating migrants in search of economic opportunities; they make space for themselves in informal settlements. There is also not enough land in the public domain for developing adequate open spaces or augmenting infrastructure capacities.
    • Lack of Housing:The pandemic revealed that the cities’ economies rely on migrant populations in the formal and informal sectors. Workers in both markets move from rural to urban and urban to urban areas as they find better opportunities; they are mobile and need adequate rental options. Today, in most Indian cities, this demand is not met and leads to unaffordable options, pushing the poorer sections out to slums and other informal settlements.
    • Lack of Transport: Indian cities are infamous for their road congestion; three of them rank in the 10 most congested in the world according to the 2020 TomTom Travel Index with Mumbai ranking second. The existing public transportation systems are already overcrowded and of poor quality.
    • Lack of Public health: Like other health crises, the COVID-19 pandemic revealed the need to ensure adequate healthcare services and sanitation infrastructure for a healthy population in cities. In the initial months of the outbreak, the focus of health services shifted entirely towards addressing the novel coronavirus, leaving other health issues unaddressed and shutting down routine care services.
    • Impact on Environment: The causes for low air quality are multiple; vehicular movement and on-road congestion are major contributors. A safe and clean environment is key to good public health.
    • Problems faced by vulnerable sections: The economic shock and work from home guidelines changed migration patterns; workers in cities returned to their home towns and villages. Slum dwellers, with limited access to adequate infrastructure, and migrant workers, disenfranchised from social protection systems or daily wagers, were more vulnerable to this shock. In the medium and long term, it is difficult to predict what the job market will be in cities.

    Urban

    What can be done to address the urban challenges?

    • Future planning is necessary: Manage the spatial growth of cities and allow them to build more planned road networks for future horizontal expansion and revoke faulty policies that constrain the use of floor space to build vertically.
    • Housing for all scheme is important: Focus on providing public housing for the poor; India can learn from successful models in Singapore or Hong Kong and understand the strategic challenges of other international examples such as Mexico. India can also work toenable efficient rental markets
    • Holistic transport should be focused: Integrate formal and informal modes of transportation into holistic transportation strategies to ensure seamless mobility, as well as first and last mile connectivity.
    • Increasing funds to Cities: Decentralise fiscal powers to the local level and train city authorities so that they can make more strategic decisions in health expenditures or public health infrastructure, as well as gain the capacity to raise their own resources.
    • Need of a healthy Environment: Increase the number of open spaces in the public domain, maintain them and monitor their use. Prepare for disasters with robust framework of physical infrastructures, road networks and large open spaces. Build adequate infrastructure to support the sustainable development of emerging Tier-2 and Tier 3 towns.
    • More attention to vulnerable: Develop more systematic identification mechanisms of the urban poor to ameliorate the delivery of public services and social protection. Collect accurate data on migrant population and capture their socio-economic diversity to better address their needs. Monitor access to services, housing and jobs of the vulnerable communities in real time.

    Urban

    Conclusion

    • Urban infrastructure is crumbling day by day. In the next 25 years, cities will have more population than rural areas. Indian cities need urgent reform in order to unlock their economic potential and transform quality of life.

    Mains Question

    Q.Discuss the urban infrastructure challenges? What are the governments scheme and actions to address the urbanization challenges?

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  • Stressed ecology of Bay of Bengal

    Bay of BengalContext

    • At the fourth BIMSTEC summit, Prime Minister Narendra Modi announced the opening of the Centre for Bay of Bengal Studies (CBS) at Nalanda University. The launch of the CBS has once again demonstrated India’s commitment to advancing constructive agendas by forging connections and setting up platforms for all those with an interest in the of Bay of Benagl.

    Bay of BengalWhy Bay of Bengal is so important?

    • Commerce hub: The Bay has long been a major commerce hub for the Indian Ocean. It created a conduit between the East and the West in terms for trade and culture.
    • Emerging arena of maritime warfare: An Indo-Pacific orientation and the realignment of global economic and military power towards Asia have had a considerable impact on the Bay region.
    • Communication and Energy: The key sea lanes of communication in this area are lifelines for global economic security and are crucial to the energy security that powers the economies of many countries in the region.Further, non-traditional dangers including terrorism and climate change have become more prevalent.
    • Under water resources: The Bay also provides an opportunity for greater regional cooperation in the environmentally friendly exploration of marine and energy resources. The Bay has a biodiverse marine environment.
    • Fresh water resources: It receives the water from some of the world’s largest rivers. It is a partially enclosed sea that has given rise to several geological characteristics.
    • Ecology: It is home to many rare and endangered marine species and mangroves, which are essential to the survival of the ecology and the fishing sector.

    Bay of BengalWhy ecology in the region is under threat?

    The region’s maritime environment has changed as are result of major powers expanding their economic and geopolitical influence.

    • Competition: Political and cultural engagement, together with economic competition, have taken on new dimensions. More crucially, the Bay’s ecosystem is going through an unprecedented crisis brought on by widespread environmental exploitation and geopolitical unrest.
    • Resource exploitation: Species extinction is a result of careless exploitation of the maritime environment, which has severe consequences on biodiversity. Problems such as population growth, altered land use, excessive resource exploitation, salinity, sea level rise, and climate change are exerting significant strain on the Bay’s environment.
    • Water pollution: Operational discharge from small and medium feeder ships, shipping collisions, unintentional oil spills, industrial waste, pollution, and the accumulation of non- biodegradable plastic litter are all contributing to the deterioration of the Bay.
    • Declining ecology: A dead-zone has formed, and the mangrove trees that protect the shore from the fury of nature are under more threat than ever.

    What could be the Solutions?

    For a better knowledge of challenges, and strategies to overcome them for the sustainable development of the region, more focused and inter-disciplinary study is required on these issues.

    • Centre for Bay of Bengal studies: By founding the CBS, Nalanda University has already started its journey and given the nation a unique interdisciplinary research centre devoted to Bay focused teaching, research, and capacity building. Additionally, scholars from many countries and academic streams are already participating in CBS’s first certificate programme on the Bay.
    • Inter-governmental cooperation: It is essential that nautical neighbours develop a partnership and cooperate because of the maritime domain’s interrelated and interdependent nature, transnational character, and cross-jurisdictional engagement of various governments and diverse organisations and enterprises.
    • Maritime connectivity: A few concerns that need immediate attention include expanding cooperation in maritime safety and security, enhancing cooperation on maritime connectivity and the ease of maritime transit, and boosting investment possibilities in the maritime connectivity sector.
    • Illegal activities: The latter subject involves addressing non-traditional threats and fostering group efforts to reduce illicit, unreported, and unregulated fishing.
    • Data sharing: Standardising and harmonising data reporting.
    • Balanced approach: Furthermore regional marine entities should strive to balance opportunities and goals on a national, regional, and international scale.
    • Investment in R&D: Littoral governments need to support and promote skill-building, research, and training.

    Conclusion

    • Countries in the Bay of Bengal need to mobilise investments, manage maritime affairs more effectively. Alternative lifestyle should be explored. The cooperation of all member states, for information gathering, sharing and result oriented actions is crucial in protecting the ecology of Bay of Bengal.

    Mains Question

    Q.Countries in the Indian subcontinent are developing rapidly, putting serious stress on the environment of the Bay of Bengal.Mention the challenges and suggest solutions.

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  • Transboundary Flood Disasters

    Transboundary Flood Disasters

    Context

    • Pakistan experiencing devastation, with a spread of diseases and severe shortage of potable water after intense flooding. In June this year Assam experienced one of its worst floods in which it affected over 30 districts. Assam and Bihar frequently suffer from transboundary flood disasters.

    What is transboundary flood?

    • Floods that are originate in upper riparian state crosses the international boundary and also affects the lower riparian state. For example, river Brahmaputra causes flood both in China and India simultaneously.

    Transboundary Flood DisastersHow the transboundary floods are difficult to manage than normal floods?

    • Flooding is still considered to be a natural phenomenon that cannot be entirely prevented. But it is compounded by the lack of transparency in the sharing of hydrological information and also information relating to activities (such as by one riparian state) that are transboundary in their effect (affecting other riparian states), thus serving as an obstacle in understanding the magnitude of flooding.

    Transboundary Flood DisastersWhat is a riparian state?

    • A riparian state is state (or country) located alongside a river.

    What are the International laws governing transboundary waters?

    There are at two international treaties that governs the transboundary water

    • UNWC:
    • United Nations Convention on the Law of the Non-Navigational Use of International Watercourses (UNWC) 1997.UNWC contains a direct reference to floods, which covers harmful conditions and the emergency situations.
    • Article 27 of the Convention says, Watercourse States shall individually and, where appropriate, jointly, take all appropriate measures to prevent or mitigate conditions that may be harmful to other watercourse States, whether resulting from natural causes or human conduct or desertification.
    • Environmental Impact Assessment:
    • The International Court of Justice (ICJ), in the Pulp Mills on the River Uruguay (Argentina vs Uruguay) case of 2010, upheld that conducting a transboundary environmental impact assessment (TEIA) of a planned measure or projects on the shared water course is part of customary international law.
    • In fact, the ICJ noted that the acting state must notify the affected party of the results of TEIA for assessment of its own damages that are likely to occur.
    • UNECE: United Nations Economic Commission for Europe (UNECE) on the Protection and Use of Transboundary Watercourses and International Lakes 1992 (Water Convention).

    Transboundary Flood DisastersHow India manages transboundary flood?

    • Note:Neither India nor China are signatory to UNWC or UNCEC.
    • River Brahmaputra: India has signed the memorandum of understanding (MoU) with China in 2013 with a view to sharing hydrological information during the flood season (June to September). The MoU does not allow India access to urbanisation and deforestation activities on the Chinese side of the river basin.
    • Rivers Gandak and kosi: Floods are also a recurrent problem in the Kosi and Gandak river basins that are shared by India and Nepal.
    • The India-Nepal Kosi agreement 1954: Agreement aimed at reducing devastating flooding in the river basin. The treaty-based joint bodies have also tried to refine the early warning systems for flood forecasting.

    What are the suggestions?

    • Signing the treaty: Expert suggests, India by becoming a party to either the UNWC and the Water Convention could lay the groundwork for a bilateral treaty on the Brahmaputra but subject to the reservation that it should not insist on the insertion of a dispute settlement mechanism provision.
    • Information exchange: In contravention of procedural customary international law obligation, India considers data on transboundary rivers as classified information, which is one of the key challenges in developing cross-border flood warning systems. India needs to share the hydrological and river information for its own sake.

    Conclusion

    • Climate change has accelerated the frequency and intensity of floods across the world. with Changing climate India should also change its strategy to protect its people, to preserve the soil and to save its resources from the scourge of floods.

    Mains Questions

    Q.Climate change has created a more difficult challenge in flood management. In this context, what measures can be taken to deal with frequent transboundary floods in India. Discuss.

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  • The heavy rainfall and the crazy Banglore flood: A case to study

    floodContext

    • The recent events of heavy downpours in short period of time and the recent example of Banglore flood, highlights how cities in India and elsewhere need to adapt to climate change as it brings more extreme rainfall in the future.

    What is heavy downpour?

    • A downpour or cloudburst is a sudden and unexpected heavy fall of rain.
    • It is usually local in nature and of brief duration. Most so-called cloudbursts occur in connection with thunderstorms.
    • Heavy downpour in short period causes flood, damage to buildings and infrastructure can disrupt transport, communications and connectivity, loss of crops and livestock.

    The heavy rainfall and the Banglore flood causes

    • Rise in built up area: Lakes and natural depressions may not always fill up during many monsoons so the people who are unaware of hydrology tempts to build and buy in the catchment areas of water-bodies, which will be disastrous when it rains heavily as there is rise in the quantity.
    • Water-logging: rainwater and sewage water are forced to build up, which results in water-logging. The highway acts as a dam for the water ,Garbage frequently clogs drains, which limits the flow of sewage, and they are too small to support the weight of the expanding population.
    • Physical shrinkage of water-bodies: Destruction of lakes is a major issue .lakes can store the excess water and regulate the flow of water however the pollution of natural water bodies and converting them for development purposes has increased the risks of floods. Unplanned growth, Rise in population, rise in the built up areas along streams, canals, around the lakes, leaving no storage capacity.
    • Compromised runoff potential and health hazards: Choked and encroached drains and lakes, ill designed infrastructure and missing pipes compromising run off potential. Not only the physical quantity of the runoff that poses a hazard. When polluted drains and lakes overflow, the flood can pose a health hazard especially to vulnerable and exposed marginal communities living in informal settlements.
    • Zero or limited ability to allow infiltration of water: Encroachments in and around wetlands and green lands harming the natural way of water infiltration and ground water recharge.
    • Lack of vision in rain water harvesting: Ignorance towards the tradition rain water harvesting techniques and no or limited vision for creating new systems of rain water harvesting. Exceptionally heavy monsoon rains have been exacerbated by poor urban planning in the Indian tech hub, showing the need for improved water systems.

    floodWhat are the reasons behind the frequent floods in urban areas?

    • Meteorological factors: change in the weather patterns, increase in the temperature leading to heavy rainfall, sudden downpour, cloudburst, thunderstorms, hailstorms etc.
    • Hydrological factors: Natural surface infiltration rate, soil moisture level, presence or absence of Overbank flows, Presence of impervious cover, the occurrence of high tides impeding the drainage in coastal cities.
    • Man-Made factors:
      • Unplanned urbanization: Unplanned settlement is one of the main cause of urban flooding. Blocking of natural drainage pathways through construction activity and encroachment on catchment areas, streams, rivers, lakebeds. Reduced infiltration and ground water recharge of water, destruction of lakes, Land-use changes (e.g. surface sealing due to urbanization, deforestation) increase runoff and sedimentation. Inefficiency or non-maintenance of infrastructure etc.
      • Outdated Drainage systems: The old and ill-maintained drainage system is one of the main factor making cities in India vulnerable to flooding
      • Encroachments on and around water-bodies: Illegal Habitations started growing into towns and cities alongside rivers and watercourses. As a result of this, the capacity of the natural drains has decreased, resulting in flooding.
      • Climate Change: Climate change due to various anthropogenic events has led to extreme weather events, increasing temperature which resulting in heavy rainfall in one part while drought and dry spells in other.
      • Poor Solid Waste Management System: Indiscriminate disposal of solid waste, poor waste management system, clogging drains because of accumulation of non-biodegradable wastes are major concerns. Domestic, commercial and industrial waste and dumping of it into the drains also contribute significantly to reducing their capacities.
      • Reduced Seepage: use of hard and non-porous construction material making the soil impervious, reducing the seepage capability in no of cities in India.
      • Weak Implementation and lack of awareness:Even with provisions of rainwater harvesting, sustainable urban drainage systems, etc, in regulatory mechanisms like the Environmental Impact Assessment (EIA), adoption at user end as well as enforcement agencies remains weak.
      • No Community Participation:Flood control measures planned without participation of the affected community are unsustainable as they do not meet the needs of relevant stakeholders.

    What can be done to prevent the urban floods and prevent losses?

    • Developing climate Resilient Infrastructure: using permeable material for roads and pavement, green roofs and harvesting systems in buildings. To reduce the burden of road infrastructure in cities Outer Ring Road should be explored. Innovative approaches like Sponge Cities wetland restoration, flushing systems using collected rooftop water, public spaces as flexible water retention facilities can be applied to Indian urban areas.
    • Use of technology in Early Warning Systems and Communication: Early-warning systems using sensors across waterbodies and drains, and a network of communication for hotspots of emerging flood risk in the wet-season should be put in place. Providing real-time data where traditional systems fail. Tools such as predictive precipitation modelingcan help do that and are also able to link it with the adaptive capacity of urban land use.
    • Proper management and regular upgrade of Urban Drainage System: drains need to be cleaned on a regular basis to permit the free flow of water .Proper management of the drainage system is necessary to ensure that the water does not get stored in one place. Watershed management and emergency drainage plan should be clearly enunciated in policy.
    • Rainwater Harvesting: It will serve the twin purposes of lowering the peak runoff and raising the groundwater table. Many municipal corporations in India have already made rainwater harvesting compulsory. 
    • Conservation of Water Bodies: Urban water bodies like lakes, tanks, and ponds also play a very important role in the management of urban flooding by reducing the flood water run-off by capturing it.
    • Holistic approach: Improved monitoring, forecasting, and decision-support systems. Find out the different method for improving the preparedness for urban flooding.
    • Responsibility on every stakeholder: Locally, citizens, local ward officials and staff will need to work together to minimize dumping of solid waste and garbage in storm-water drains. As this is a socio –political problem, public participation awareness and responsibility of citizen is the need of the hour. To develop a long-lasting solution, all parties must acknowledge the issues and adopt a thorough strategy.

    What we as citizens can do on a personal level to prevent the urban environment?

    • Raising voice at all available forums and platforms
    • Making politicians and bureaucrats accountable
    • Refuse to buy a house in the encroached lands.
    • Applying methods of rain water harvesting on individual level.

    Way ahead

    • Exceptionally heavy monsoon rains have been exacerbated by poor urban planning in the Indian tech hub, showing the need for improved water systems.
    • Urbanization is a global and inevitable process, and with cities as engines of the economy, built-up areas will continue to grow. But we need to draw upon these experiences and the growing perils of climate change and extreme rain events and change course.
    • According to UN projections, by 2050 more than 68% of the world’s population could be concentrated in urban areas.
    • In this context, resilience-based strategies should be adopted to improve the capacity to handle the crisis arising out of climate change.
    • Wetlands are the kidneys of the earth, let’s keep it healthy.

     

    Mains Question

    Q. What are the factors causing flood in the urban cities? What are the measures to prevent the urban flooding keeping in mind the sustainable development? Discuss.

     

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  • Southwest Monsoon begins early Withdrawal/Retreat

    The southwest monsoon rainfall, 7% more than normal, has started to withdraw.

    What is Monsoon Withdrawal/Retreat?

    • In India, retreating monsoon is the withdrawal of south-west monsoon winds from North India.
    • The withdrawal is gradual and takes about three months.
    • With the retreat of the monsoons, the clouds disappear and the sky becomes clear. The day temperature starts falling steeply.
    • Monsoon rains weaken all over India except few southeastern states.
    • It is helpful in Rabi crop cultivation.

    Factors affecting the retreat

    Two predominant factors cause the phenomenon:

    (1) Land topography

    • First, the low mountain range in each region runs from north to south, shielding it from west-bound winds that trigger summer monsoon.
    • After summer, the range aids in the ‘orographic lift’ or rising of east-bound air mass from a lower to higher elevation, forming clouds and resulting in rain.

    (2) Atmospheric convection

    • The second factor is atmospheric convection or vertical movement of air.
    • As the earth is heated by the sun, different surfaces absorb different amounts of energy and convection may occur where the surface heats up very rapidly.
    • As the surface warms, it heats the overlying air, which gradually becomes less dense than the surrounding air and begins to rise.
    • This condition is more favorable from September to February because of the role played by sea surface temperature or water temperature.

    Immediate factors influencing withdrawal

    • The withdrawal of the monsoon is based on meteorological conditions such as-
    1. Anti-cyclonic circulation (dry air that is the opposite of a cyclone)
    2. Absence of rain in the past five days and
    3. Dry weather conditions over the region

    When does it occur?

    • The monsoon withdrawal is a long-drawn process and extends into mid-October, though the IMD considers September 30 to be the final day of the season over India.
    • The rain after that is categorised as “post-monsoon” rainfall.

    Try this PYQ:

    Q.The seasonal reversal of winds is the typical characteristic of:

    (a) Equatorial climate

    (b) Mediterranean climate

    (c) Monsoon climate

    (d) All of the above climates

     

    [wpdiscuz-feedback id=”9s1wlwig7j” question=”Please leave a feedback on this” opened=”1″]Post your answers here.[/wpdiscuz-feedback]

     

    Also read:

    Various terms related to Indian Monsoon

     

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  • What is Karoo-Ferrar Large Igneous Province?

    karoo

    A new study shows that a decline in continental plate movement likely controlled the onset and duration of many of the major volcanic events throughout Earth’s history.

    Why is the news?

    • Previous studies have linked major volcanic eruptions with past mass extinctions and disturbances in the global climatic, environmental and the carbon cycle.
    • Large igneous province volcanism, formations due to major volcanic eruptions occurring throughout Earth’s history, released large quantities of greenhouse gasses and toxic compounds into the atmosphere.
    • The sea warmed up by 4°C to 10°C, even at low- to mid-latitudes, the study noted.
    • Increased acidic levels and a lack of oxygen drove major ocean extinctions.
    • Large-scale volcanism took place in southern Africa, Antarctica and Australia. This is known as the Karoo-Ferrar Large Igneous Province.

    About Karoo-Ferrar Large Igneous Province

    • The Karoo and Ferrar Large Igneous Provinces (LIPs) are two large igneous provinces in Southern Africa and Antarctica respectively, collectively known as the Karoo-Ferrar, Gondwana, or Southeast African LIP associated with the initial break-up of the Gondwana supercontinent.
    • Its flood basalt mostly covers South Africa and Antarctica but portions extend further into southern Africa and into South America, India, Australia and New Zealand.
    • Karoo-Ferrar formed just prior to the breakup of Gondwana in the Lower Jurassic epoch, about 183 million years ago.
    • This time corresponds to the early Toarcian anoxic event and the Pliensbachian-Toarcian extinction.

     

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  • Urban floods mitigation

    floods
    Context

    • Bengaluru floods are alarming us to go for robust disaster management strategies.

    What is flood?

    • Floods are the most frequent type of natural disaster and occur when an overflow of water submerges land that is usually dry. Floods are often caused by heavy rainfall, rapid snowmelt or a storm surge from a tropical cyclone or tsunami in coastal areas.

    Causes of frequent urban floods

    Natural

    • Meteorological Factors:Heavy rainfall, cyclonic storms and thunderstorms causes water to flow quickly through paved urban areas and impound in low lying areas.
    • Hydrological Factors: Overbank flow channel networks, occurrence of high tides impeding the drainage in coastal cities.
    • Climate Change: Climate change due to various anthropogenic events has led to extreme weather events.

    Anthropological

    • Unplanned Urbanization:Unplanned Urbanization is the key cause of urban flooding. A major concern is blocking of natural drainage pathways through construction activity and encroachment on catchment areas, riverbeds and lakebeds.
    • Destruction of lakes: A major issue in India cities. Lakes can store the excess water and regulate the flow of water. However, pollution of natural urban water bodies and converting them for development purposes has increased risk of floods.
    • Unauthorised colonies and excess construction: Reduced infiltration due paving of surfaces which decreases ground absorption and increases the speed and amount of surface flow
    • Poor Solid Waste Management System: Improper waste management system and clogging of storm-water drains because of silting, accumulation of non-biodegradable wastes and construction debris.
    • Drainage System:Old and ill maintained drainage system is another factor making cities in India vulnerable to flooding.
    • Irresponsible steps: Lack of attention to natural hydrological system and lack of flood control measures.

    floodsImpact of the devastation due to floods:

    • On economy: Damage to infrastructure, roads and settlements, industrial production, basic supplies, post disaster rehabilitation difficulties etc.
    • On human population and wildlife:Trauma, loss of life, injuries and disease outbreak, contamination of water etc.
    • On environment:Loss of habitat, tree and forest cover, biodiversity loss and large scale greenery recovery failure.
    • On transport and communication: Increased traffic congestion, disruption in rail services, disruption in communication- on telephone, internet cables causing massive public inconvenience.

    Solutions for effective flood management

    • Improved flood warning systems: effective flood warning systems can help take timely action during natural calamities and can save lives. Pre-planning can significantly reduce the effects of floods, giving people time to migrate to safer locations and stock up essentials.
    • Building flood-resilient housing systems: concreting floors can be very useful during floods. Houses should be water proofed and electric sockets should be placed at higher levels up the walls to reduce the chances of shocks.
    • Constructing buildings above flood levels: buildings should be constructed a metre above from the ground to prevent flood damage and evacuation during floods.
    • Resilience to Climate change: drastic climate changes have increased the frequency of natural disasters in many parts of the world. Governments should bring about environment-friendly policy level changes and eliminate the ones hazardous to the environment to tackle the problem of global warming.
    • Create wetlands and encourage reforestation: creating more and more wetlands can help soak up excessive moisture since wetlands act as sponges. Wooded areas can also slow down heavy water flow, minimizing the effects of floods. Reforesting upstream regions can significantly reduce the effects of flood damage.
    • Improve soil conditions: improper soil management, animal hooves, and machinery can make soil compacted. As a result, instead of holding water in and absorbing moisture, the water runs off immediately. Properly drained soil can absorb large amounts of rainwater and can prevent it from flowing into the rivers.
    • Installing flood barriers: these are flood gates designed to prevent the area behind the barrier from flooding. They can also be kept around buildings to keep floodwaters outside the boundary created.
    • Development of GIS– Geographical Information System (GIS) based National Database: for disaster management. GIS is an effective tool for emergency responders to access information in terms of crucial parameters for disaster-affected areas.
    • Developing a Federal flood management plan: with responsibilities of union and state clearly defined.
    • Creation of 2nd flood commission: (Rashtriya Barh Aayog, created in 1976) to study the flood situation in India under rising challenges of climate change and propose a national-level flood resilience and management plan.

    Way forward

    • Resilience of people: The rapid transformation in rainfall characteristics and flooding patterns demand building people’s resilience.
    • Reconsider projects: Construction projects that impede the movement of water and sediment across the floodplain must be reconsidered.
    • Use of technology: At the same time, climate-imposed exigencies demand new paradigms of early-warning and response systems and securing livelihoods and economies.

    Conclusion

    • We can learn to live with nature, we can regulate human conduct through the state and we can strategically design where we build. We need to urgently rebuild our cities such that they have the sponginess to absorb and release water without causing so much misery and so much damage to the most vulnerable of our citizens.

    Mains question

    Q. We need to urgently rebuild our cities such that they have the sponginess to absorb and release water. Discuss the statement in context of urban flood management strategy in India.

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  • Forest fire management for positive sustainable forest growth

    forest fireContext

    • Forest fires are becoming more common and wildfires are destroying nearly twice as much tree cover globally as they did in 2001.

    Why in news?

    • Climate change is driving more intense and widespread forest fire by fuelling more extreme heat and deepening drought, which dries out forests.

    How to define forest fire?

    • A wildfire, forest fire, bushfire, wildland fire or rural fire is an unplanned, uncontrolled and unpredictable fire in an area of combustible vegetation starting in rural and urban areas.

    What causes forest fires?

    • Human activities: Forest fires can be caused by a number of natural causes, but officials say many major fires in India are triggered mainly by human activities.
    • Climate change: Emerging studies link climate change to rising instances of fires globally, especially the massive fires of the Amazon forests in Brazil and in Australia in the last two years. Fires of longer duration, increasing intensity, higher frequency and highly inflammable nature are all being linked to climate change.
    • Season: In India, wildfires are most commonly reported during March and April, when the ground has large quantities of dry wood, logs, dead leaves, stumps, dry grass and weeds that can make forests easily go up in flames if there is a trigger.
    • Natural reasons: Under natural circumstances, extreme heat and dryness, friction created by rubbing of branches with each other also have been known to initiate fire.

    forest fire

    Key fact

    7.4 million acres of forest are getting burnt annually now an area roughly the size of Belgium.

    What factors make forest fires a concern?

    • Carbon emission: They act as a sink, reservoir and source of carbon.
    • Livelihood loss: In India, with 1.70 lakh villages in close proximity to forests (Census 2011), the livelihood of several crores of people is dependent on fuelwood, bamboo, fodder, and small timber.
    • Destruction of animals’ habitat: Heat generated during the fire destroys animal habitats. Soil quality decreases with the alteration in their compositions.
    • Soil degradation: Soil moisture and fertility, too, is affected. Thus forests can shrink in size. The trees that survive fire often remain stunted and growth is severely affected.

    Measures to curb Forest fires

    1) National Action Plan on wild fires

    • The MoEFCC has prepared a National Action Plan on wild fire in 2018 after several rounds of consultation with all states and UTs.
    • The objective of this plan is to minimize forest fires by informing, enabling and empowering forest fringe communities and incentivizing them to work in tandem with the State Forest Departments.
    • The plan also intends to substantially reduce the vulnerability of forests across diverse forest ecosystems in the country against fire hazards, enhance capabilities of forest personnel and institutions in fighting fires and swift recovery subsequent to fire incidents.

    2) Forest Fire Prevention and Management scheme

    • The MoEFCC provides wildfire prevention and management measures under the Centrally Sponsored Forest Fire Prevention and Management (FPM) scheme.
    • The FPM is the only centrally funded program specifically dedicated to assist the states in dealing with forest fires.
    • The FPM replaced the Intensification of Forest Management Scheme (IFMS) in 2017. By revamping the IFMS, the FPM has increased the amount dedicated for forest fire work.
    • Funds allocated under the FPM are according to the 90:10 ratio of central to state funding in the Northeast and Western Himalayan regions and 60:40 ratio for all other states.
    • Nodal officers for forest fire prevention and control have been appointed in each state.

    forest fireWay forward

    • Awareness should be created among the villagers residing near the forests with respect to the long-term ill effects of forest fires.
    • Measures to prevent wildfires have to be taken before summer season when fires are prevalent.
    • Local people should be given skills to use online portals or mobile apps in order to monitor the forests for fires and inform forest authorities regarding the same.

    Mains question

    Q. Climate change is driving more intense and widespread forest fires by fueling more extreme heat and deepening drought. Why forest fires are cause of concern? Discuss our preparedness level for the same in the above context.

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