GIS-Based Frequency Ratio Method for Identification of Potential Landslide Susceptible Area in the Siwalik Zone of Chatara-Barahakshetra Section, Nepal

Abstract

The hilly regions of Nepal are potential for land sliding in rainy season. Lying between two major thrusts: Main Frontal Thrust (MFT) and Main Boundary Thrust (MBT), the rocks of Siwalik zone are very weak and fragile. Shallow and deep landslides are very common in the Siwalik zone during heavy and continuous rainfall. The landslide in the busy road and agglomerate settlements are destroying the life and properties every year in rainy season. This study aims to develop a landslide susceptibility map of Chatara-Barahakshetra area, Siwalik zones of eastern Nepal by the means of frequency ratio model. The paper utilized the remote sensing and GIS to develop a landslide susceptibility map. Total of 382 landslide polygons were mapped from Google earth and by field verification. The validation results showed that the success rate curve with 72.55 percentage of the area lying under the curve and the prediction rate curve with 71.73 percentage of the area lying under the curve indicating that prediction ability of the Frequency Ratio model. These landslide susceptibility maps can be used as a planning tool by prioritizing areas for controlling the landslide effects. More than 71% success rate indicate that frequency ratio model is suitable model for the landslide susceptibility in the study area.

Assessment of Landslide: A five decade impact study on human life in the Koshi Province

“…Large number of thrusts and faults are positioned from east to west in the Himalayas range. Main frontal thrust (MFT) and main boundary thrust (MBT) are major active faults where weak and fragile zone exists (Thapa & Bhandari, 2019;Dhital et al, 1993). Small and large landslide can be observed along these faults.…”

Decadal Evolution of Landslides in the Siwalik Zone: a Case Study of Babai Watershed, Nepal

“…Numerous researchers (Ghimire, 2011;Devkota et al, 2013;Regmi et al, 2014;Gyawali & Tamrakar, 2018;CDES, 2016;Tamrakar et al, 2002;Thapa & Bhandari 2019) studied the landslide susceptibility and dynamics however, the studies lacked the evolution process of landslides. The landslides of the Babai River catchment are not inherent by road construction and human disturbance where most of the landslides naturally occurred (Bhandari & Dhakal, 2021).…”

Landslide Susceptibility Mapping Using GIS and Bivariate Statistical Models in Chemoga Watershed, Ethiopia

“…Over the last decades, many studies utilized used different models to prepare landslide susceptibility mapping. These models include the frequency ratio (FR) model [2,4,[13][14][15][16][17][18]. Frequency and Shannon entropy models [19][20][21][22][23][24], weights of evidence model [12,[25][26][27][28][29], and Shannon entropy model [11,[30][31][32][33].…”