Roadmap for Answer Writing 1. Introduction (1-2 sentences) Introduce glacial lakes and highlight their formation due to glacial melting. Briefly define what a Glacial Lake Outburst Flood (GLOF) is and its potential dangers. Key Points for Introduction Glacial lakes are bodies of water formed in ...
Model Answer Introduction Landslides are a natural disaster triggered by various factors, including geological, topographical, and climatic conditions. However, human activities such as deforestation, mining, and construction have significantly contributed to making landscapes more vulnerable to theRead more
Model Answer
Introduction
Landslides are a natural disaster triggered by various factors, including geological, topographical, and climatic conditions. However, human activities such as deforestation, mining, and construction have significantly contributed to making landscapes more vulnerable to these disasters. These activities disrupt the natural environment, destabilizing the land and increasing the likelihood of landslides.
Deforestation and Landslide Risk
Deforestation involves the removal of trees, which play a critical role in stabilizing slopes. Trees help hold soil together with their roots, reducing erosion and absorbing excess water. Without vegetation, soil becomes more prone to erosion and water infiltration, increasing the risk of landslides. In deforested areas, surface runoff can saturate the soil, further weakening its stability and triggering landslides. A clear example of this is the June 2013 disaster in Uttarakhand, India, where heavy rainfall, compounded by deforestation in the Himalayas, led to flash floods and landslides, killing over 5,000 people.
Mining and Landslide Risk
Mining activities, especially when they involve excavation and blasting, can destabilize the land. The removal of large amounts of soil and rock alters the natural slope and reduces the land’s ability to retain water, making it more prone to sliding. The vibrations from heavy machinery and explosives can further weaken the soil structure. In Colombia’s Cauca Department, mining operations for gold and coal have led to significant geological hazards, including landslides, by disrupting drainage patterns and weakening soil.
Construction and Landslide Risk
Construction activities, such as road building and foundation excavation, also increase landslide susceptibility. These activities often alter slopes and can add extra weight to unstable ground, making it more likely to fail. The disruption of soil and the increased pore water pressure from construction activities further weaken the land. A tragic example occurred in La Conchita, California, in 2005, when heavy rains triggered a landslide, killing 10 people and destroying homes after construction activities had destabilized the slope.
Conclusion
Human activities such as deforestation, mining, and construction significantly contribute to landslide susceptibility by destabilizing the land and increasing the potential for disasters. To reduce the impact of these activities, proper land-use planning, soil stabilization, and disaster preparedness are essential for mitigating the risk of landslides.
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Model Answer Glacial lakes are bodies of water formed by the melting of glaciers. They typically occur at the foot of a glacier but can also form within, on, or under it. These lakes are commonly found at the edges of glaciers and ice sheets, and they are categorized into two types: ice contact lakeRead more
Model Answer
Glacial lakes are bodies of water formed by the melting of glaciers. They typically occur at the foot of a glacier but can also form within, on, or under it. These lakes are commonly found at the edges of glaciers and ice sheets, and they are categorized into two types: ice contact lakes, where glacier ice meets lake water, and distal lakes, located further from the glacier but still influenced by it.
Factors Contributing to Glacial Lake Outburst Floods (GLOFs)
Glacial Lake Outburst Floods (GLOFs) happen when a glacial lake’s dam, often made of moraine or ice, suddenly bursts, releasing large amounts of water downstream. Several factors contribute to the occurrence of GLOFs:
Conclusion
These floods can cause catastrophic downstream damage, as seen in the 2013 Kedarnath disaster and Chamoli flash floods in 2021 (Source: NDMA).
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