Research on characteristics of groundwater recharge in Weishan Irrigated District based on bromide tracer

Cong, Sin, author
Xu, Zhenghe, author
Wang, Tong, author
Colorado State University, publisher
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It is of great theoretical and practical significance to determine the vertical infiltration recharge of groundwater by Bromide tracer technology, which reveals the spatial variation rule of groundwater recharge and improves the theory and method of groundwater resource evaluation. Bromide was used as tracer in Weishan Irrigated District to determine the groundwater recharge as well as to evaluate the impacts of different irrigation basin location, irrigation regime and crop types on the recharge. The comprehensive recharge coefficient and the Kringing Spatial Interpolation methods were used to distinguish the effects of precipitation and surface water irrigation on groundwater recharge rate. The results showed that the recharge rates ranged from 85.8 to 243 mm/a, with an average of 168 mm/a; the average recharge rate in the upstream district was greater than that in the downstream; the average recharge rate of irrigated land (193 mm/a) is greater than that of non-irrigated land (110 mm/a). The recharge rate of winter wheat-summer maize and cotton fields with irrigation was 210 mm/a and 140 mm/a, respectively while it was 115 mm/a and 94.1 mm/a under no irrigation conditions. The comprehensive recharge coefficient of groundwater in the upstream irrigation area was larger than that in the downstream. By comparing the spatial distribution of groundwater level and comprehensive recharge coefficient, it was found that there was an inverse relationship between the groundwater level and the comprehensive recharge coefficient.
2018 annual AGU hydrology days was held at Colorado State University on March 19 - March 21, 2018.
Includes bibliographical references.
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