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| The Macro-characteristics of Groundwater Flow in the Badain Jaran Desert |
| Zhang Jing1, Wang Xusheng1,2, Hu Xiaonong2, Lu Huiting1, Gong Yanping1, Wan Li2 |
1. School of Water Resources & Environment, China University of Geosciences (Beijing), Beijing 100083, China;
2. Ministry of Education Key Laboratory of Groundwater Circulation and Evolution, China University of Geosciences (Beijing), Beijing 100083, China |
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Abstract The hydraulic connection between the lower sub-basin of the Heihe River Basin (HRB) and the surrounding area is a key problem for the local ecological construction project. The Badain Jaran Desert (BJD) has a 180-kilometer borderline with the HRB lower sub-basin, but its groundwater flow patterns are unclear due to lack of hydrogeology survey. It produces an uncertain item in the water budget of the HRB lower sub-basin. To solve the problem, groundwater level measuring and borehole exploring in BJD were carried out based on previous hydrogeological and geophysical survey data, the first-order approximate water table contours were drawn for shallow groundwater according to 461 known-points and 63 semi-known points. The results indicated that the ground water level in BJD features a decline trend from southeast to northwest with a hydraulic gradient 0.6‰-4.0‰. Lakes in the southeast area could disturb the local groundwater flow field but could not alter the macro-direction of groundwater flow. The Quaternary sands consist the main aquifer of shallow groundwater in the BJD, the total thickness of these sediments is generally larger than 100 m, thick in the central region and thin in the edge. It connects groundwater in the BJD and in the HRB lower sub-basin. The BJD groundwater recharges to the plain areas of the Gurinai Lake、Ejinaqi in the HRB lower sub-basin and the Guaizi Lake area, with a total runoff (0.61-1.97)×108 m3·a-1. Among the total runoff, there is (0.33-1.06)×108 m3·a-1 runoff is contributed to the Gurinai Lake Plain. The estimation results were still influenced by several uncertain factors.
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Received: 17 November 2014
Published: 20 May 2015
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2015, Vol. 35 
