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• W2028835208 abstract "Subsurface water content is an important state variable in hydrological systems. Established methods to measure subsurface water content have a small support scale which causes scaling problems in many applications. Time-lapse relative gravimetry can give an integrated measure of soil water storage changes over tens to hundreds of cubic meters. The use of time-lapse gravimetry in hydrology has until recent years been limited by the large efforts required to obtain precise and accurate gravity data at the 1 μGal (10−8 ms−2) scale. A typical modern relative gravimeter, the Scintrex CG-5, has a sensitivity of 1 μGal, corresponding to a layer of 0.024 m of water in an infinitely extended horizontal sheet. For gravity surveys using relative gravity meters, the precision is highly dependent on the methods used to operate the gravimeter in the field. Systematic errors, which are difficult to detect, can lead to a loss of accuracy. As a performance test of a CG-5 for applications of time-lapse gravity in hydrology, we have measured the change in water storage in an indoor basin. The experiment was designed to resemble a field application, e.g. a pumping test, a forced infiltration experiment or alluvial aquifer storage change along intermittent rivers, so that the results can be applied to field experiments. The use of a 20 m by 30 m rectangular basin with a known water volume resulted in complete control over the instrument accuracy. Precisions of 3 μGal and accuracies of < 5 μGal were found for the time-lapse gravity change. An introduction to hydrogravimetric measurements and data processing are given in order to facilitate the use of the method by non-geophysicists." @default.
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• W2028835208 date "2011-05-01" @default.
• W2028835208 modified "2023-10-10" @default.
• W2028835208 title "Measuring gravity change caused by water storage variations: Performance assessment under controlled conditions" @default.
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• W2028835208 doi "https://doi.org/10.1016/j.jhydrol.2011.03.004" @default.
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