A global analysis of ground water depletion

Authors: Shrinidhi Ambinakudige*, Mississippi State University, Aynaz Lotfata, Mississippi State Univerity
Topics: Water Resources and Hydrology, Remote Sensing, Environment
Keywords: Ground water, GRACE, Global
Session Type: Poster
Day: 4/12/2018
Start / End Time: 1:20 PM / 3:00 PM
Room: Napoleon Foyer/Common St. Corridor, Sheraton, 3rd Floor
Presentation File: No File Uploaded

Groundwater accounts for about 33 percent of total water withdrawals worldwide (Silbert et al. 2010). In many parts of the world, public water supply and irrigation are the major source of groundwater exploitation (Scheidleder et al., 1999). Groundwater acts as the key strategic reserve in times of drought. However, faster depletion of groundwater in drought regions can significantly deteriorate the living conditions and affect the global water security. The frequency and severity of droughts are expected to increase and groundwater depletion can exacerbate the impacts of droughts (Konikov and Kendy, 2005).
In this study, we investigated the relation between groundwater anomalies and the frequency of droughts in various regions and aquafers of the world. We used GRACE satellite data (Gravity Recovery and Climate Experiment), Land data assimilation system (GLDAS) and the Multivariate Standardized Drought Index (MSDI). The preliminary results have shown that the groundwater depletion is extensive in regions such as the California Central Valley, the Northwestern India and the Northern Middle East (Iran, Iraq, Syria and Turkey). Similarly, frequency of droughts also increased in many parts of the world. In the southwestern United States, frequent drought conditions have resulted in crop loss (Long et al., 2013). Some of the worst draughts were in South Africa, North Korea, Brazil, Spain, Australia etc. Our study results also indicated significance spatial and temporal variations in groundwater anomalies and drought frequencies.

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