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GS Paper: GS1

  • Glacial Lake Outburst in Ladakh

    In August 2014, a glacial lake outburst flood (GLOF) hit the village of Gya in Ladakh, destroying houses, fields and bridges. Researchers now have mapped the evolution of Gya glacial lake and note the cause of the flood.

    What is glacial lake outburst flood?

    • A GLOF is a type of outburst flood that occurs when the dam containing a glacial lake fails.
    • An event similar to a GLOF, where a body of water contained by a glacier melts or overflows the glacier, is called a Jökulhlaup.
    • The dam can consist of glacier ice or a terminal moraine.
    • Failure can happen due to erosion, a buildup of water pressure, an avalanche of rock or heavy snow, an earthquake, volcanic eruptions under the ice, or glacier collapses into it.

     How did it happen in Ladakh?

    • It was not a spillover but rather a tunnelling of drainage process that caused GLOF in Gya lake.
    • Imagine a bucket full of water. It can overflow when you drop a stone, or the water can drain if there is a hole under the bucket.
    • Similarly, here the flooding did not happen due to the spillovers due to an avalanche or landslide, rather there was a thawing of the ice cores in the moraine.

    Back2Basics: Glacial Landforms

    Glacial landforms are landforms created by the action of glacier movements.

    As the glaciers expand, due to their accumulating weight of snow and ice they crush and abrade and scour surfaces such as rocks and bedrock.  The resulting erosional landforms include striations, cirques, glacial horns, arêtes, trim lines, U-shaped valleys, over-deepening and hanging valleys.

    • Cirque: Starting location for mountain glaciers
    • Cirque stairway: a sequence of cirques
    • U-shaped, or trough, valley: U-shaped valleys are created by mountain glaciers. When filled with ocean water so as to create anthe glacial action erodes through, a spillway (or col) forms
    • Valley step: an abrupt change in the longitudinal slope of a glacial valley

    When the glaciers retreated leaving behind their freight of crushed rock and sand (glacial drift), they created characteristic depositional landforms.  Examples include glacial moraines, eskers, and kames. Drumlins and ribbed moraines are also landforms left behind by retreating glaciers.

    • Esker: Built-up bed of a subglacial stream
    • Kame: Irregularly shaped mound
    • Moraine: Feature can be terminal (at the end of a glacier), lateral (along the sides of a glacier), or medial (formed by the merger of lateral moraines from contributary glaciers)
    • Outwash fan: Braided stream flowing from the front end of a glacier

  • Cyclonic storms during October

    October to December period is among the favourable months for the development of cyclones in the Bay of Bengal and the Arabian Sea. This year, however, October passed without witnessing a cyclonic storm.

    Must read: [Burning Issue] Tropical Cyclones and India

    https://www.civilsdaily.com/burning-issue-tropical-cyclones-and-india/

    When do cyclones form and hit Indian coasts?

    • About 80 cyclones are formed around the world annually, out of which five are formed in the Bay of Bengal and the Arabian Sea, together known as the North Indian Ocean.
    • India’s east and west coasts are prone to cyclones with the maximum associated hazards—rain, heavy winds and storm surge— faced by coastal districts of West Bengal, Odisha and Andhra Pradesh.
    • Cyclones in the North Indian Ocean are bi-modal in nature, that is, they occur during two seasons— April to June (pre-monsoon) and October to December (post-monsoon).
    • Of these, May and November remain the most conducive for the development of cyclones.

    When have cyclones skipped October, previously?

    • Cyclonic disturbances— either in the form of a well-marked low pressure, depression or a deep depression— are common in October.
    • Ocean disturbances enter the Bay of Bengal from the South China seaside and head towards the Indian coast.
    • IMD officials have attributed it to the weak La Nina conditions along the equatorial Pacific Ocean.
    • Cooler than normal sea surface temperatures over this region—termed as La Nina— has been prevailing since August this year.

    Madden Julian Oscillation (MJO)

    • Because Madden Julian Oscillation (MJO) was positioned in a favourable phase, the low-pressure systems intensified maximum up to a deep depression.
    • MJO is kind of an eastward-moving cyclic weather event along the tropics that influences rainfall, winds, sea surface temperatures and cloud cover. They have a 30 to 60-day cycle.
    • Most importantly, there was the high wind shear noted between the different atmospheric levels, last month.
    • The vertical wind shear— created due to significant wind speed difference observed between higher and lowers atmospheric levels— prevented the low-pressure systems and depression from strengthening into a cyclone.

  • Brown Carbon ‘Tarballs’

    A study has highlighted that brown carbon ‘tarballs’ that fasten the glacial melting has been found in the Himalayan atmosphere.

    We are still to find a solution for the ill-fated Delhi air,  and here comes another blow from the stubble burnings.

    What are Brown Carbon ‘Tarballs’?

    • Tarballs are small light-absorbing, carbonaceous particles formed due to burning of biomass or fossil fuels that deposit on snow and ice.
    • They are formed from brown carbon, emitted during the burning of fossil fuels.
    • The median sizes of externally mixed tarballs and internally mixed tarballs were 213 and 348 nanometre respectively.
    • Primary brown carbon (BrC) co-emitted with black carbon (BC) from biomass burning is an important light-absorbing carbonaceous aerosol.
    • The black carbon from the Indo-Gangetic Plain can reach the Himalaya region and influence glacial melting and climatic change.

    Highlights of the study

    • Until now, black carbon was found to be transported long distances by the wind to the Himalayan atmosphere.
    • The study revealed that a dense array of active fire spots — corresponding to large-scale wheat-residue burning on the Indo-Gangetic Plain — occurred along the pathways of Himalaya.
    • The percentage of the tarballs increased on days of higher levels of pollution and could contribute to the hastening of glacial melt and global warming.
    • The researchers concluded that tarballs from long-range transport can be an important factor in the climatic effect and would correspond to a substantial influence on glacial melting in the Himalaya region.

  • Supreme Court’s guidelines for deserted Wives and Children

    The Supreme Court has laid down uniform and comprehensive guidelines for family courts, magistrates and lower courts to follow while hearing the applications filed by women seeking maintenance from their estranged husbands’.

    Debate: Alimony as a right of women or a feminist taboo

    Why such a judgement?

    • Usually, maintenance cases have to be settled in 60 days, but they take years, in reality, owing to legal loopholes.
    • The top court said women deserted by husbands are left in dire straits, often reduced to destitution, for lack of means to sustain themselves and their children.
    • Despite a plethora of maintenance laws, women were left empty-handed for years, struggling to make ends meet after a bad marriage.

    What did the Court say?

    • The Supreme Court has held that deserted wives and children are entitled to alimony/maintenance from the husbands from the date they apply for it in a court of law.
    • To ensure that judicial orders for grant of maintenance are duly enforced by husbands, the court said a violation would lead to punishments such as civil detention and even attachment of the property of the latter.
    • The plea of the husband that he does not possess any source of income ipso facto does not absolve him of his moral duty to maintain his wife, if he is able-bodied and has educational qualifications, the court declared.
    • Both the applicant wife and the respondent-husband have to disclose their assets and liabilities in a maintenance case.
    • Other factors such as “spiralling inflation rates and high costs of living” should be considered, but the wife should receive alimony which fit the standard of life she was used to in the matrimonial home.

    Covering expenses

    • The expenses of the children, including their education, basic needs and other vocational activities, should be factored in by courts while calculating the alimony.
    • Education expenses of the children must be normally borne by the father. If the wife is working and earning sufficiently, the expenses may be shared proportionately between the parties.

    Permanent alimony

    • The court opined it would not be equitable to order a husband to pay his wife permanent alimony for the rest of her life, considering the fact that in contemporary society marriages do not last for a reasonable length of time.
    • Anyway, the court said, the duration of marriage should be accounted for while determining the permanent alimony.

  • Char-chaporis of Assam

    A proposed museum reflecting the “culture and heritage of the people living in char-chaporis” has stirred up a controversy in Assam.

    Do you know?

    Phumdis are a series of floating islands, exclusive to the Loktak Lake in Manipur. They cover a substantial part of the lake area and are heterogeneous masses of vegetation, soil and organic matter, in different stages of decay.

    What are char-chaporis?

    • A char is a floating island while chaporis are low-lying flood-prone riverbanks.
    • They are used interchangeably as they keep changing shapes — a char can become a chapori, or vice versa, depending on the push and pull of the Brahmaputra.
    • Prone to floods and erosion, these areas are marked by low development indices.
    • While Bengali-origin Muslims primarily occupy these islands, other communities such as Misings, Deoris, Kocharis, Nepalis also live here.
    • In the popular imagination, however, chars have become synonymous to the Bengali-speaking Muslims of dubious nationality.

    Who are the Miyas?

    • The ‘Miya’ community comprises descendants of Muslim migrants from East Bengal (now Bangladesh) to Assam.
    • They came to be referred to as ‘Miyas’, often in a derogatory manner.
    • The community migrated in several waves — starting with the British annexation of Assam in 1826, and continuing into Partition and the 1971 Bangladesh Liberation War.

  • WWF Water Risk Filter

    Nearly a third of the 100 cities in the world susceptible to ‘water risk’ — defined as losses from battling droughts to flooding — are in India, according to the WWF Water Risk Filter.

    Try this question for mains:

    Q.For Indian cities to break away from the vicious loop of flooding and water scarcity, nature-based solutions like restoration of urban watersheds and wetlands could offer an alternative. Examine.

    What is Water Risk Filter?

    • This is an online tool, co-developed by the Worldwide Fund for Nature that helps evaluate the severity of risk places faced by graphically illustrating various factors that can contribute to water risk.
    • Launched in 2012, it is a practical online tool that helps companies and investors assess and respond to water-related risks facing their operations and investments across the globe.
    • After a major upgrade in 2018, the Water Risk Filter 5.0 enables companies and investors to Explore, Assess, Value and Respond to water risks.
    • Lately, the Water Risk Filter provides scenarios of water risks for 2030 and 2050, integrating climate and socio-economic changes in different pathways.

    Highlights of the recent analysis

    • It reported 30 Indian cities that would face a ‘grave water risk’ by 2050 due to a dramatic increase in their population percentage to 51 per cent by 2050, from 17 per cent in 2020.
    • Jaipur topped the list, followed by Indore and Thane. Mumbai, Kolkata and Delhi also featured on the list.
    • The global list includes cities such as Beijing, Jakarta, Johannesburg, Istanbul, Hong Kong, Mecca and Rio de Janeiro. China accounts for almost half the cities.

    Major recommendations

    • The future of India’s environment lies in its cities. As India rapidly urbanizes, cities will be at the forefront both for India’s growth and for sustainability.
    • For cities to break away from the current vicious loop of flooding and water scarcity, nature-based solutions like restoration of urban watersheds and wetlands could offer solutions.
    • Urban watersheds and wetlands are critical for maintaining the water balance of a city, flood cushioning, micro-climate regulation and protecting its biodiversity, the report notes.

  • Punjab Connection of the Irish freedom movement

    Ireland is commemorating 100 years of the mutiny by a British Army battalion stationed in Jalandhar and Solan in Punjab in support of the Irish freedom movement.

    Try this PYQ:

    Q.With reference to the Indian freedom struggle, consider the following events:

    1. Mutiny in Royal Indian Navy
    2. Quit India Movement launched
    3. Second Round Table Conference

    What is the correct chronological sequence of the above events?

    (a) 1-2-3

    (b) 2-1-3

    (c) 3-2-1

    (d) 3-1-2

    Irish mutiny in India

    • The Connaught Rangers were raised during the British Army reforms of 1881.
    • A British Army battalion belonging to the Connaught Rangers was the one in which Irish soldiers mutinied in Jalandhar and Solan in Punjab.
    • Solan now lies in Himachal Pradesh but in 1920 it was part of Punjab. The Ist Battalion of the Connaught Rangers was stationed in Jalandhar since January 1920 after it had taken part in the First World War.

    Why did the mutiny take place?

    • The troops were protesting against the behaviour of the ‘Black and Tans’ during the Irish War of Independence (1919-22).
    • The Black and Tan were members of the Irish constabulary which had been recruited from Great Britain and mostly comprised demobilized soldiers who had fought in the First World War.
    • The Irish soldiers felt that they must rise in solidarity with their compatriots back in Ireland and hence in June and July 1920 some of the regiment’s men mutinied.
    • Some of the mutinied soldiers were later put through a court-martial.

    Who were the Black and Tans?

    • They were constables recruited into the Royal Irish Constabulary (RIC) as reinforcements during the Irish War of Independence.
    • Recruitment began in Great Britain in January 1920 and about 10,000 men enlisted during the conflict.
    • The vast majority were unemployed former soldiers from Great Britain who fought in the First World War, although some were from Ireland.

  • Who was Maharani Jindan Kaur?

    Maharani Jindan Kaur, the last wife of Maharaja Ranjit Singh, is in news for the auction of some of her jewellery in London.

    Try this PYQ:

    Q.Consider the following Bhakti Saints:

    1. Dadu Dayal
    2. Guru Nanak
    3. Tyagaraja

    Who among the above was/were preaching when the Lodi dynasty fell and Babur took over?

    (a) 1 and 3

    (b) 2 only

    (c) 2 and 3

    (d) 1 and 2

    Who was Rani Jindan (1817-1863)?

    • She was the youngest wife of Ranjit Singh, founder of the Sikh empire, whose boundaries stretched from Kabul to Kashmir and the borders of Delhi.
    • She was also the mother of Duleep Singh, the last ruler of the empire, who was raised by the British.
    • Duleep Singh was five years old when he was placed on the throne in 1843 after the death of two heirs to Ranjit Singh. Since he was just a child, Maharani Jindan was made the regent.
    • Not a rubber stamp, she took an active interest in running the kingdom, introducing changes in the revenue system.

    Anglo-Sikh War and Jindan

    • The British declared war on the Sikh empire in December 1845. After their victory in the first Anglo-Sikh war, they retained Duleep Singh as the ruler but imprisoned Jind Kaur.
    • She escaped and arrived at Kathmandu on April 29, 1849, where she was given asylum by Jung Bahadur, the prime minister.
    • She was given a house on the banks of river Bhagmati. She stayed in Nepal till 1860, where she continued to reach out to rebels in Punjab and Jammu-Kashmir.

  • What are Western Disturbances?

    With the approaching winter, minimum temperatures in the national capital have trended downward over the last due to the arrival of northwesterly winds called Western Disturbances.

    Try this PYQ:

    Q.Westerlies in the southern hemisphere is stronger and persistent than in northern hemisphere. Why?

    1. The southern hemisphere has less landmass as compared to the northern hemisphere.
    2. Coriolis force is higher in the southern hemisphere as compared to the northern hemisphere

    Which of the statements given above is/are correct?

    (a) Only 1

    (b) Only 2

    (c) Both 1 and 2

    (d) Neither 1 nor 2

    Western Disturbances

    • A western disturbance is an extratropical storm originating in the Mediterranean region that brings sudden winter rain to the northwestern parts of the Indian subcontinent.
    • It is a non-monsoonal precipitation pattern driven by the westerlies.
    • The moisture in these storms usually originates over the Mediterranean Sea, the Caspian Sea and the Black Sea.
    • Extratropical storms are global phenomena with moisture usually carried in the upper atmosphere, unlike their tropical counterparts where the moisture is carried in the lower atmosphere.
    • In the case of the Indian subcontinent, moisture is sometimes shed as rain when the storm system encounters the Himalayas.
    • Western disturbances are more frequent and strong in the winter season.

    Their significance

    • Western disturbances, specifically the ones in winter, bring moderate to heavy rain in low-lying areas and heavy snow to mountainous areas of the Indian Subcontinent.
    • They are the cause of most winter and pre-monsoon season rainfall across northwest India.
    • Precipitation during the winter season has great importance in agriculture, particularly for the rabi crops.
    • Wheat among them is one of the most important crops, which helps to meet India’s food security. An average of four to five western disturbances forms during the winter season.
    • The rainfall distribution and amount vary with every western disturbance.

    Also read: Polar Vortex 

  • In news: Great Barrier Reef

    Australian scientists have found a detached coral reef on the Great Barrier Reef that exceeds the height of the Empire State Building and the Eiffel Tower.

    Try this PYQ:

    Q.Consider the following statements:

    1. Most of the world’s coral reefs are in tropical waters.
    2. More than one-third of the world’s coral reefs are located in the territories of Australia, Indonesia and the Philippines.
    3. Coral reefs host far more number of animal phyla than those hosted by tropical rainforests.

    Which of the above statements is/are correct?

    (a) 1 and 2 only

    (b) 3 only

    (c) 1 and 3 only

    (d) 1 and 3 only

    About Great Barrier Reef

    • The Great Barrier Reef is the world’s largest coral reef system composed of over 2,900 individual reefs and 900 islands.
    • It is stretched for over 2,300 kilometres over an area of approximately 344,400 square kilometres.
    • The reef is located in the Coral Sea, off the coast of Queensland, Australia.
    • It was world heritage listed in 1981 by UNESCO as the most extensive and spectacular coral reef ecosystem on the planet.

    Why it is significant?

    • This is first such discovery in over 100 years.
    • The “blade-like” reef is nearly 500 metres tall and 1.5 kilometres wide.
    • It lies 40 metres below the ocean surface and about six kilometres from the edge of the Great Barrier Reef.

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