Geospatial Modelling of Groundwater Fluctuation Using Remote Sensing and GIS - A Case Study for Hosur Union

摘要

This paper describes the study of groundwater fluctuation in the study area usingremote sensing and GIS technique. In this study, Hosur Union of Krishnagiri district,Tamil Nadu, was selected as the study area. The base map of the study area wasprepared by using Survey of India Toposheet at a scale of 1:50000. The groundwaterfluctuations were studied for varying rainfall intensity. The analysis was carried outusing spatial interpolation technique and Thiessen polygon method. For the analysisby spatial interpolation technique, the water level fluctuations for every 4 years intervalwere considered. In this technique, spline method was used to create the continuoussurface for groundwater data. This method considers the distance between bothunknown points and known points and measures the spatial correlations between twopoints so that the weights can change according to the spatial arrangements of samples.In Thiessen polygon method, Voronoi polygons were created so that every locationwithin a polygon is closer to the sample point in that polygon than any other samplepoint. The Voronoi mapping tool provides a number of methods for assigning orcalculating values to polygons. The results by both the methods indicated that theoverall groundwater potential is low in the study area.