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Influence of motor-pumped well and underground water level on Karez water quantity by numerical simulation |
Zhang Wei1, Zhang Aijun1, Xing Yichuan2, Song Zhipeng1, Maierdan Maimaiti1, Liu Liying3 |
1.College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 3.China Jikan Research Institute of Engineering Investigations and Design, Xi′an, Shaanxi 710048, China |
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Abstract Karez and motor-pumped wells have long been two kinds of important irrigation infrastructures in Turpan. However, because the motor-pumped wells layout and water resources exploitation are not in a scientific manner, the groundwater level has fallen off below a normal level, treating the existence of Karez. Firstly, the hydrogeological situations of the pluvial fan in front of the flame mountain in Xinjiang are investigated, then the water quantity model of Karez is established according to its unique working mechanism. The influences of location, number and discharge of motor-pumped wells as well as groundwater level on the Karez water quantity are analyzed. The results show that the Karez water quantity has a negative relationship with the distance between a Karez and a well, and the influence depends upon the location and the layout of the wells. A single well has a very limited impact upon the water quantity, while multi-well have more influence. The conservation of Karez should be emphasized on the control of underground water level, meanwhile the number of motor-pumped wells and their discharge should be strictly regulated.
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Received: 16 September 2014
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