The research of groundwater flow model in Ejina Basin,Northwestern China |
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Authors: | Haiyang Xi Qi Feng Wei Liu JianHua Si Zongqiang Chang Yonghong Su |
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Institution: | (1) Cold and Arid Region Environmental and Engineering Research Institute, Chinese Academy of Sciences, 320# West Donggang Road, 730000 Lanzhou, China;(2) Alashan Desert Eco-Hydrology Experimental Research Station, 730000 Lanzhou, China;(3) State Key Laboratory of Hydrosciences and Engineering, Tsinghua University, 100084 Beijing, China |
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Abstract: | Water resources is a primary controlling factor for economical development and ecological environmental protection in the
inland river basins of arid western China. Groundwater, as the important component of total water resources, plays a dominant
role in the development of western China. In recent years, with the utilization ratio of surface water raised, the groundwater
recharge rate has been reduced by surface water, and groundwater was exploited on a large-scale. This has led to the decline
of groundwater levels and the degradation of eco-environments in the lower reaches of Heihe watershed, especially. Therefore,
the study on the groundwater-level change in recent years, as well as simulating and predicting groundwater levels changes
in the future is very significant to improve the ecological environment of the Heihe River Basin, coordinate the water contradiction,
and allocate the water resources. The purpose of this study is to analyze the groundwater-level variations of the Ejina region
basin on a large-scale, to develop and evaluate a conceptual groundwater model in Ejina Basin; according to the experimental
observation data, to establish the groundwater flow model combining MODFLOW and GIS Software; simulated the regional hydrologic
regime in recent 10 years and compared with various delivery scenarios from midstream; determined which one would be the best
plan for maintaining and recovering the groundwater levels and increasing the area of Ejina Oasis. Finally, this paper discusses
the possible vegetation changes of Ejina Basin in the future. |
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