A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Mehrotra, G. S.
- Morphometric Appraisal of Slope Instability of Chilla Landslide, Garhwal Himalaya
Authors
1 Central Building Research Institute, Roorkee, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 44, No 2 (1994), Pagination: 203-211Abstract
A major landslide occurred in January 1990 on the left bank of Tal river, near Chilla in Hardwar district which raised a part of the river bed by 6-8 m. It has emerged as successive rotational slide forming numerous radial and longitudinal cracks with tension cracks on the slopes near the escarpment. The present paper highlights the geological, geomorphological and morphometric parameters to identify the factors responsible for instability of slope. A detailed morphometric assessment of the slide area has also been carried out with a view to prepare a zonation map of slide area in terms of instability. The study has been found very useful to understand the mechanism of the slide area and also to suggest suitable recommendations for control measures at proper locations in the slide area. The future behaviour of the slide area can also be assessed.Keywords
Landslide, Morphometric Indices, Geomorphology, Himalaya.
- Terrain Analysis and Spatial Assessment of Landslide Hazards in Parts of Sikkim Himalaya
Authors
1 Central Building Research Institute, Roorkee-247 667, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 47, No 4 (1996), Pagination: 491-498Abstract
Landslides and slope instability problems are quite common in Sikkim Himalaya. Recent developmental activities in this region have aggravated the incidence of landslides to a great extent. The ongoing developmental activities, therefore, call for delineation of safe and unsafe zones.
The present study involves the preparation of landslide hazard zonation map of East Sikkim Himalaya in a semiquantitative way by evaluating various terrain factors like lithology, structure, slope, landuse and drainage in relation to existing landslides. A numerical weightage called Landslide Susceptibility Value (LSV) has been assigned to each factor and Landslide Susceptibility Index (LSI) of each category of factor maps has been catculated. Based on the proposed methodology landslide hazard zonation map of the area is prepared showing five zones of slope instability. This map may serve as a base map for any developmental activities to be planned in the terrain. An attempt has also been made to establish the relationships of various geoenvironmental factors with the landslide activity with an objective to develop an appropriate methodology for landslide hazard zonation.