Presenter : Galla Sireesha Naidu
Global warming, changes in precipitation levels and temperatures gained significant research interest on water resources and development of adaptive management strategies. An analysis of the changes in water availability of a hydrologic system becomes necessary to establish adaptive strategies and check their efficiency. The present study aims to quantify the changes to be expected in the reservoir inflow under climate change by adopting a hydrologic model. For the development of a hydrological model, various inputs are required such as water delineation maps,flow direction,fraction and station-location files using Digital Elevation Model (DEM) data sets. The present study identifies a hydrological system using SAGA(System for Automated Geoscientific Analyses) and QGIS(Quantum GIS) open source software for delineation and working with various vector and raster input files data files required for hydrological modelling. An open source hydrological model which works at macro-scale, the Variable Infiltration Capacity(VIC) routing hydrological model is used to simulate the historical reservoir inflows. The proposed methodology is applied on the Nagarjuna Sagar Reservoir,along Krishna River, India for the time period of 1971 to 2005 using IMD Rainfall and Temperature data. The Krishna basin was delineated and other routing inputs such as flow direction, fraction and station location files were obtained using SAGA and QGIS softwares. This study provides a clear understanding of how various open source softwares can be used to identify a hydrological system and provide estimates of projected changes in reservoir inflows of that system which can be further used for water supply management in the downstream areas.