Study of spetial variability of hydrological relevant variables in Krishna river basin, India

Master of Science in Geoinformatics 2013-2015 EXT Radhakrishnan T Riddhi Singh (Assistant Professor) " IIT, Hyderabad"

Availability of water is a major issue facing by the planet during several years. On the present context there need a scientific method for analyzing the nature and processes behind the availability of water, so that the water that is available can be utilized optimally. On that scenario a study has carried out using the influencing factors about the water availability. The factors that are precipitation and evapotranspiration. Both these factors, their trends and their nature in variation are studied on a sub basin scale by selecting Krishna river basin in India and on its seven sub basins. As the variables are changing its nature spatially its variability has to be studied in various spatial extents. So the technique of Geographic Information System is used to study the spatial variability. The data of precipitation from Indian Meteorological Department (IMD), Pune and the evapotranspiration data from the Moderate Resolution Imaging Spectroradiometer (MODIS), database is used. By using the GIS software Arc Map 10.3 the studies about the spatial variability in the variables like precipitation and evapotranspiration is done. The availability of water is thus calculated from the precipitation and evapotranspiration, as the available water is the difference in the gain due to precipitation and the loss due to evapotranspiration. The study was carried out for a time scale of eleven years from 1983 – 1993. By correlating the average values of these three parameters such as precipitation, evapotranspiration and the availability of water, shows that there is a spatial variability in hydrologic variables over space.