Impacts of environmental flow controls on the water table and groundwater chemistry in the Ejina Delta,northwestern China |
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| Authors: | Ping Wang Jingjie Yu Yichi Zhang Guobin Fu Leilei Min Fei Ao |
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| Institution: | (1) Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 11A, Datun Road, Chaoyang District, Beijing, 100101, People’s Republic of China;(2) Graduate University of the Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, People’s Republic of China; |
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| Abstract: | The impacts of environmental flow controls on the water table and chemistry of groundwater in the Ejina Delta, an arid inland
river basin in northwest China, were investigated with field observations in 2001 and 2009. The results indicate that the
shallow groundwater level rose by 0–2 m in the upper reaches of the east tributary of the Heihe River and in the areas of
Saihantaolai—Dalaikubu during the period of environmental flow controls. The chemical constituents of the groundwater show
a distinct spatial heterogeneity with the total dissolved solids (TDS) in the groundwater increasing from the periphery towards
the depocenter of the Ejina Basin. In addition, the rate of groundwater cycling in the south of the Ejina Delta increased,
and the mineralization of groundwater declined, while the overall mineralization and salinity increased in the northern regions,
especially in the depocenter of the Ejina Basin. Since shallow groundwater is important to the ecology of arid regions, and
because understanding the changes in the shallow groundwater environment (groundwater level and hydrochemistry) in response
to environmental flow controls is essential for the sustainable improvement of the ecological environment, the results of
this paper can be used as a reference for watershed water resources planning and management to help maintain the health and
proper function of rivers in arid regions. |
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