Integration of Geospatial Technology and AHP knowledge Based Technique in Preparation of Susceptibility Modelling to Gully Erosion: A Study from Cratonic Part of Eastern India

Abstract

Gully erosion is conceived as one of the environmental problems resulting mainly from surface run-off and associated geo-physical factors. This erosion augments the process of land degradation. To identify the major factors responsible in this process and their assessment in preparation of gully erosion susceptibility mapping, the geospatial technology has been a huge support for earth scientists for decades. Proper analysis and assessment of satellite images employing multi-criteria decision making models facilitates the estimation of areas of soil erosion and gully formation. The present study, carried out in eastern plateau fringe of India using Remote Sensing (RS) and Geographical Information System (GIS), and Analytical Hierarchy Process (AHP) model to assess zones susceptible to gully erosion. The study reveals around 52% area of Rupai basin experiences moderate to very high gully erosion, and the model is validated performing an accuracy assessment, which is computed as 72.72%. The factors are hold major responsible factors in soil erosion and gully formation are geomorphology, slope, Land Use and Land Cove (LULC), soil and Stream Power Index (SPI). Sites, such as Kutidih, Mahakudar and Kuki experience loss of soil approximately 6.09, 40.96, and 1.40 tonne respectively. The generated gully erosion susceptibility map may help in planning and management of soil and water conservation.