Abstract
Abstract. Since last few decades, India has met to major crises related to groundwater. Major cities, for example, Delhi, Chennai, Bengaluru etc. are facing extreme risk of water crisis. In next few decades, this may lead to a major water crisis when this non-renewable resource is exhausted. Gravity Recovery and Climate Experiment (GRACE) mission, widely used for monitoring of groundwater storage change, could be utilized to get the information of exact amount of water above or below the surface of the earth that may be used to counter act over such situation of water crisis. GRACE mission consists of two earth orbiting satellite vehicles (SVs) separated by 220 km with the objective of computing change in gravity by increasing or decreasing distance between both the SVs caused by higher or lower gravity masses. The primary objective of the presented work is to obtain the liquid water equivalent height in a selected area using GRACE mission data with GLDAS soil moisture data. The advantage of using GRACE is that it provides better accuracy (fraction of 1cm) in comparison to traditional methods, therefore, larger extent could be covered. This paper extensively discusses about GRACE application (especially groundwater monitoring), challenges with GRACE missions and about effective methods for groundwater recharge.
Highlights
During the last two-three decades, the water level in the whole world is gradually decreasing, which can cause huge crises all over the world
For example, Delhi, Chennai, Bengaluru etc. are facing extreme risk of water crisis which may lead to a major water crisis when this non‐renewable resource is exhausted
The red zone in the plot indicates the regions of water scarcities whereas the blue zone indicates the regions of water availability
Summary
During the last two-three decades, the water level in the whole world is gradually decreasing, which can cause huge crises all over the world. GRACE data has been widely used for ground water monitoring purpose, in correcting gravity models and reducing correlation errors between two hydrological datasets Byron et al (2004) presents the application of GRACE data in measuring temporal variations in geoid and discusses potential factors and possible errors in GRACE estimates. Strassberg et al (2007) presents the potential of GRACE data in monitoring seasonal ground water storage in semiarid regions by comparing ground water results obtained by GRACE and field data. The primary objective of the research work is to obtain temporal change in water equivalent height of Allahabad district of India using GRACE mission data with GLDAS soil moisture data
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