Use of Water Balance and Tracer-Based Approaches to Monitor Groundwater Recharge in the Hyper-Arid Gobi Desert of Northwestern China

15595 9 85778 2 241092 document 85778 environments-05-00055.pdf application/pdf 448c386b5eeffdb5f3321f10c1c372b8 MD5 2538330 2018-11-26 07:23:45 https://pure.iiasa.ac.at/id/eprint/15595/1/environments-05-00055.pdf 15595 1 1 application/pdf text en public cc_by_4

environments-05-00055.pdf

published 85785 2 241113 document 85785 lightbox.jpg image/png 8dcf91b0ee12104a63a5b94a43d47cc7 MD5 49704 2018-11-26 07:34:09 https://pure.iiasa.ac.at/id/eprint/15595/2/lightbox.jpg 15595 2 2 image/png other Thumbnails conversion from text to thumbnail_lightbox en public

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/85778 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/85778 http://eprints.org/relation/isIndexCodesVersionOf https://pure.iiasa.ac.at/id/document/85778 archive 353 disk0/00/01/55/95 2018-11-26 07:25:09 2021-08-27 17:31:04 2018-11-26 07:25:09 article show Akiyama T. Kubota J. Fujita K. Tsujimura M. Nakawo M. Avtar R. Kharrazi A. 8681 0000-0002-5881-2568 Use of Water Balance and Tracer-Based Approaches to Monitor Groundwater Recharge in the Hyper-Arid Gobi Desert of Northwestern China pub prog_asa groundwater recharge; evaporation; water balance; stable isotopes; hyper-arid environment; Gobi Desert; Northwestern China The groundwater recharge mechanism in the hyper-arid Gobi Desert of Northwestern China was analyzed using water balance and tracer-based approaches. Investigations of evaporation, soil water content, and their relationships with individual rainfall events were conducted from April to August of 2004. Water sampling of rainwater, groundwater, and surface water was also conducted. During this period, 10 precipitation events with a total amount of 41.5 mm, including a maximum of 28.9 mm, were observed. Evaporation during the period was estimated to be 33.1 mm. Only the soil water, which was derived from the heaviest precipitation, remained in the vadose zone. This is because a dry surface layer, which was formed several days after the heaviest precipitation event, prevented evaporation. Prior to that, the heaviest precipitation rapidly infiltrated without being affected by evaporation. This is corroborated by the isotopic evidence that both the heaviest precipitation and the groundwater retained no trace of significant kinetic evaporation. Estimated δ-values of the remaining soil water based on isotopic fractionation and its mass balance theories also demonstrated no trace of kinetic fractionation in the infiltration process. Moreover, stable isotopic compositions of the heaviest precipitation and the groundwater were very similar. Therefore, we concluded that the high-intensity precipitation, which rapidly infiltrated without any trace of evaporation, was the main source of the groundwater. 2018-05-04 published Molecular Diversity Preservation International (MDPI) 10.3390/environments5050055 153 public Environments 5 5 55 TRUE 0711-6780 FALSE no info:eu-repo/semantics/article