Roadmap for Answer Writing To effectively address the question “How do the Western Ghats affect the South-West monsoon in the coastal regions of South-West India?”, follow this structured approach: 1. Introduction Contextualize the Topic: Introduce the Western Ghats as a significant mountain range ...
Model Answer The improper disposal of Construction and Demolition (C&D) waste, particularly in open drains and water channels, leads to blockages during heavy rains, exacerbating urban flooding. For example, the 2015 Chennai floods were worsened by the obstruction of stormwater drains caused byRead more
Model Answer
The improper disposal of Construction and Demolition (C&D) waste, particularly in open drains and water channels, leads to blockages during heavy rains, exacerbating urban flooding. For example, the 2015 Chennai floods were worsened by the obstruction of stormwater drains caused by discarded C&D debris (Building Material Promotion Council).
Hydrological Disruption and Ecological Damage
When C&D waste is discarded in sensitive areas like wetlands, riverbeds, or water channels, it disrupts the natural hydrological balance and damages aquatic ecosystems. The Yamuna River in Delhi has experienced significant ecological degradation due to C&D waste dumping in its riverbed (Source: BMPC).
Soil and Water Pollution
C&D waste often releases leachate and fine chemical particles, contaminating soil and groundwater. These pollutants degrade soil quality and contribute to land and water pollution, posing long-term environmental risks.
Fugitive Dust Pollution
C&D activities contribute significantly to fugitive dust pollution, which contains harmful substances such as silica, asbestos, and lead. In Delhi, the construction sector is a major contributor to PM2.5 pollution, which worsens air quality and can lead to smog formation .
Landfill Overload
The increasing amount of C&D waste places pressure on landfills, leading to the creation of more disposal sites and contributing to the depletion of scarce land resources.
Model Answer Barrier Effect The Western Ghats serve as a significant barrier to the monsoonal winds that arrive from the southwest. As these winds encounter the mountains, they are forced to rise, resulting in orographic rainfall. This effect leads to substantial precipitation in the region, with 65Read more
Model Answer
Barrier Effect
The Western Ghats serve as a significant barrier to the monsoonal winds that arrive from the southwest. As these winds encounter the mountains, they are forced to rise, resulting in orographic rainfall. This effect leads to substantial precipitation in the region, with 65% to 80% of annual rainfall occurring between June and September (Source: meteorological studies).
Gaps in the Western Ghats
Despite their overall barrier function, the Western Ghats feature gaps that allow rain-bearing winds to pass through with less precipitation. A notable example is the Palghat Gap, which is approximately 30 kilometers wide and located between the Nilgiri and Anamalai Hills in Kerala. This gap enables winds to cross over to the leeward side, leading to reduced rainfall in the immediate coastal areas (Source: geographic studies).
Variations in Mountain Topography
The topography of the Western Ghats varies significantly. In Karnataka, the broader mountains compel rain-bearing winds to travel greater distances, allowing more time for moisture to coalesce and resulting in higher rainfall (Source: hydrological analyses).
Increased Convection
The gentle slopes of the Karnataka Western Ghats absorb more sunlight, promoting greater convection compared to the steeper slopes found in Maharashtra and Kerala. This enhanced convection contributes to increased rainfall in these areas (Source: climate studies).
Distance from Peak
Interestingly, areas of heavy rainfall are often found up to 50 kilometers away from the mountain peaks. This phenomenon occurs because the distance allows for better moisture accumulation in cloud formations (Source: meteorological research).
Cyclones
Additionally, the Arabian Sea has seen more frequent cyclones in recent years during the onset of the South-West monsoon. The Western Ghats act as a barrier for these cyclonic storms, reducing their intensity and protecting the coastal regions of India (Source: climatological studies).
In summary, the Western Ghats significantly regulate South-West monsoonal rainfall in India’s coastal regions through orographic lifting, variations in topography, and their role in influencing cyclonic activity.
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