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Visvesvaraya National Institute of Technology (2022)

Integrated approach for drought mitigation of water resources for Vidarbha region central India

Nair, Saranya C

Titre : Integrated approach for drought mitigation of water resources for Vidarbha region central India

Auteur : Nair, Saranya C

Université de soutenance : Visvesvaraya National Institute of Technology

Grade : Doctor of Philosophy (PhD) 2022

Résumé partiel
The study aims to propose an integrated approach for drought mitigation of water resources for Vidarbha region, Maharashtra, India. Vidarbha region with its 11 districts has its peculiar climatic and topographical characteristics with a steadily increasing rainfall from western to eastern region. This disparity in climate leads to drought prone western region and flood stricken eastern region. The first objective of the study is to evaluate the performance and applicability of SWAT (Soil and water assessment tool) as a runoff model and there by identify the eastern Vidarbha as a surplus basin. The Arc-SWAT interface implemented in the ArcGIS software is used to delineate the watershed and its stream network, combine the data layers and edit the model database. Rainfall data from 1989 to 2013 (24 years) has been used for the analysis. The different thematic maps like land use/land cover map (LU/LC), contour map and Digital Elevation Model (DEM) of the study area were generated using Resourcesat-1, Linear Imaging Self Scanning Sensor-III images. From the runoff analysis using SWAT model, it is observed that an approximate amount of 28% has been generated as runoff validating the eastern part as surplus basin.

To ascertain the flood characteristics of eastern side, rainfall trend analysis has been carried out. Rainfall trend analysis is performed using historic data from India Meteorological Department (IMD), Pune and simulated data from Indian Institute of Tropical Meteorology (IITM), Pune. Historic data for a period of 100 years (1914- 2013) and predicted data for a period of 75 years (2020-2095) has been used for the analysis. The non-parametric Man-Kendall (M-K) method, Sen‘s Slope estimator and the innovative trend method by Şen were used and the results were examined. It is observed that there is an unfavorable situation of decreasing rainfall scenario with increasing rainfall intensity in the region, which means that the chances of flood scenario in the region are quite high. Another objective of the study is to estimate the drought vulnerability of the Vidarbha region through various drought indices. Assessing the drought scenario through various indices can outline the severity through different perspectives, as different indices emphasis on different hydrological parameters. Aridity Index, Seasonality index, Standard Precipitation Index (SPI) and

Standard Precipitation Evapo-transpiration Index (SPEI) has been used for the analysis. Long-term historic rainfall data of 100 years from 1914 to 2013 (IMD, Pune) and predicted data from 2020-2095 (IITM, Pune) has been used for the calculation. It is observed that because of topography and climatic features, western part is observed to be drought prone than the eastern part of the Vidarbha region.

Présentation et version intégrale (Shodhganga)

Page publiée le 25 janvier 2023