Identifying Water Storage Variation in Krishna Basin, India from <I>in situ</I> and Satellite based Hydrological Data
Authors
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CSIR–National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007
H. Munagapati -
Indian Institute of Technology, Hyderabad - 502 285
R. Yadav
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CSIR–National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007
V. M. Tiwari
DOI:
https://doi.org/10.1007/s12594-018-1074-8Abstract
Terrestrial water storage (TWS), a sum total of water stored on or beneath the earth's surface, transits in response to hydroclimatic processes such as precipitation, evapo-transpiration, runoff etc. and serves an indicator of hydrological condition of a region. We analyse spatio-temporal variance of water storage in Krishna Basin, India, derived from in-situ groundwater data and Gravity Recovery and Climate Experiment (GRACE) satellite data in order to determine physical causes of variations, and compare the variance with climatic factors such as Cumulative Rainfall Departure (CRD) and drought index i.e. Standardized Precipitation Index (SPI). GRACE satellite based TWS is found to reflect insitu groundwater changes and also shows a relationship with drought patterns as indicated by a good correlation with SPI. The largest part of TWS represents seasonal flux, and at an interannual scale, TWS depicts spatio-temporal variability in response to drought index viz. SPI. We infer that the groundwater storage derived from GRACE time-variable gravity solutions can be utilised to complement in-situ observations at basin scale and it reflects climatic forcing quite well.
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