Natural Hazards Management
Coastal Erosion
Landslide
Earthquake
 Lightning
Radioactivity
Flood
Drought
Introduction

EVALUATION STUDY IN TERMS OF LANDSLIDE MITIGATION IN PARTS OF WESTERN GHATS KERALA
(A project Sponsored by Ministry of Agriculture, Govt. of India)
Study area
Methodology
Parameters
Landslide Hazard Zonation
Socio-Economic Evaluation
Conclusions
Recommendations


METHODOLOGY
In the present study as the first stage of zonation individual factor maps like administrative units, landform, drainage, slope, landuse overburden thickness, geotechnical observation site location, are superimposed on landslide population map to assess the influence of each factor to attempt zonation based on that particular causative factor. In the second stage all such individual factor based zonation is integrated cartographically to arrive at a qualitative zonation of the area. In the third stage based on the importance of the factors zonation is attempted using Landslide Susceptibility Index. The region is then divided into the following zone Viz.,

  • Very unstable-where landslides are likely to occur in view of the prominent factors contributing to landslide being present.
  • Moderately unstable - the terrain setting is same as in the above and landslides have occurred in the past but conditions prevailing do not favour instability. However, if natural drainage is disrupted/slope modified, landslides could be triggered
  • Moderately stable zone: Dissected slopes of hills characterised by stable geological setting that can be destabilised by erosion/improper developmental activities
  • Stable zone: A very stable setting and no action by man possibly threaten the balance.