Landslide Susceptibility Analysis and Mapping in Sastha Valley of Periyar River Basin (original) (raw)

2020

Abstract

Earth attracts objects toward its surface through the gravitational force and keeps everything in place. In the case of a slope, this gravitational force may cause the materials to move along it causing what is known as landslides. This study mainly focuses on analyzing the landslide susceptibility in Sastha valley of Periyar river basin, Idukki district, Kerala. The study area shows some paleo-landslide movements indicated by sparse tea plantations and sharp meandering of the river flowing through the valley. This motivated to analyze the stability of the slopes through an extensive field investigation in the area. The stability analysis is carried out under both steady and transient states using SLOPE/W and SEEP/W software. A factor of safety map of the study area is also prepared from the GIS-TISSA model. Finally, a landslide susceptibility map of the area is generated by leveraging the results from both field study and GIS model.

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