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Catastrophic landslides have become a recurring monsoonal phenomenon in Kerala, particularly in the foothills of the Western Ghats. Recently, a devastating landslide in Wayanad claimed over 230 lives, highlighting the state's extreme vulnerability. The increasing frequency and intensity of rainfall, coupled with the region's complex geology and human interventions, are driving these disasters, necessitating urgent mitigation strategies.
From a geographic standpoint, Kerala's susceptibility to landslides is fundamentally tied to its physical characteristics and the influence of the monsoon. The state is characterized by steep terrain and weathered soils, which are inherently less stable. The presence of the Western Ghats, a region already identified as ecologically sensitive, exacerbates this vulnerability. Furthermore, the changing patterns of the Southwest Monsoon, driven by climate change and potentially phenomena like El Nino or La Nina, are leading to more frequent, high-intensity rainfall events (exceeding 204 mm in 24 hours). This extreme precipitation rapidly saturates the already weathered soil, significantly increasing the likelihood of slope failure. For UPSC, understanding the interplay between geomorphology (steep slopes, weathered soil) and climatology (extreme rainfall events) is crucial for analyzing the causes of such disasters in the Western Ghats region.
The environmental lens focuses on how anthropogenic (human-caused) factors compound natural vulnerabilities, creating a 'perfect storm' for disasters. The article highlights that while extreme rainfall is the immediate trigger, land-use changes significantly heighten susceptibility. The widespread conversion of land in the midlands and highlands for plantations (rubber, tea, coffee) and unscientific agricultural practices (like digging rain pits) disrupt the natural drainage and soil stability. Moreover, construction activities, particularly the use of unsupported 'cut-and-fill' methods on steep slopes and the modification of stream channels, further destabilize the terrain. This scenario emphasizes the critical need for sustainable land-use planning and adherence to regulations, potentially invoking the principles outlined in reports like the Madhav Gadgil Committee Report or the Kasturirangan Committee Report on the conservation of the Western Ghats, which have long warned against unbridled development in these sensitive zones.
The governance perspective centers on the critical aspect of Disaster Management (GS Paper 3) and the effectiveness of institutional frameworks in mitigating risks. A key challenge identified is the lack of precise, localized early warning systems. The sparse distribution of rain gauges makes it difficult to capture microclimatic variations essential for accurate rainfall forecasting and threshold-based warnings. The National Disaster Management Authority (NDMA) guidelines emphasize preparedness and early warning as core components of disaster risk reduction. The article underscores the necessity for Kerala to implement a stringent 'land-use policy' that restricts hazardous construction and agricultural practices in vulnerable zones, a task complicated by the state's high population density. The role of bodies like the Kerala State Disaster Management Authority (KSDMA) in identifying high-hazard zones (as highlighted by the ISRO Landslide Atlas) and enforcing regulations is paramount. The focus must shift from post-disaster relief to robust pre-disaster mitigation and preparedness, integrating scientific forecasting with community evacuation plans.