3D MODELLING IN GIS FOR LAND SLIDE STUDIES

Abstract

Geographical Information System (GIS) is in use in many application areas since its advent. In the present date it has come upto solid (3D) modelling from planimetric (2D) modelling. Landslides, one of the major natural hazards, are generally studied in 2D perspective. 2D analysis involves many assumptions with which, it is difficult to satisfy the behaviour of practical landslide phenomena. It would be rather realistic if the landslides are studied in their 3D perspective using GIS provided required data is available. Generally subsurface data of slide is not available. Therefore, in the present study a model was developed based on synthetic data. Many analysis tools like rendering, visualization, Boolean logics, characterization, sectioning were applied. Later same methodology was applied to Matli slide in Uttarkashi district on the Uttarkashi-Tehri road. On the developed model slope stability analysis was carried out. Then volume of different geological layers which are prone to slide were computed. For the management of the slide a rataining wall has been proposed and designed. Some of the design parameters were observed from the developed model. The present study demonstrates the capability of 3D modelling in GIS. A landslide is a 3D phenomenon, 3D GIS has wide applications in studies related to landslides.