Site selection for Soil conservation by geometric analysis of watershed in the southeastern part of Aravalli mountain range using Remote sensing and GIS
Keywords:
Soil conservation, prioritization, Aravalli, Udaipur, Remote Sensing, GIS,Abstract
Remote sensing and GIS is very valuable and time saving techniques for drainage analysis. The purpose of the study is to locate the area susceptible to soil erosion and to mitigate the hazards by improving soil conservation. Drainage channel and Watershed boundary were demarcated by using topographic map, SRTM DEM of 1 arc resolution and satellite data (Landsat 2008 and Google earth image) under GIS environment. Linear, shape and relief parameter has been computed for each sub-watershed using arc map 10.2 and assigned rank based on the relationship with erodibility so as to arrive at a compound value for the final rankings of each sub-watershed. Value of compound parameter and priority for soil conservation are inversely proportional to eachother . On the basis of compound value the Ahar watershed has been classified into three classes (high, medium and low) in terms of priority for soil conservation and management. On the basis of the compound parameter the eleven sub-watersheds have been classified into three priority zone. The sub-watersheds UDSW3, 5, 8, 9 and 11 of the western part of the area consist of steep slopes, high drainage density, high stream frequency, low form factor and low elongation ratio are fall in high priority zone with respect to soil erodibility. Subwatershed UDSW6 and UDSW10 belongs to the eastern side of study area is fall in low priority zone. So the five sub-watersheds of high priority need to give the highest priority for land, soil erosion and rock fall prevention practice.
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