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| Effect of natural river sand and artificial filter layer on water outflow from permeation pipe |
| HUANG Haitao1, LIU Huanfang1*, JIN Jin1, LIU Shuangxi2, LIU Yao1 |
| 1. College of Water Conservancy and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003, China; 2. Xinjiang Jingou River Basin Administration Bureau, Shawan, Xinjiang 832100, China |
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Abstract To explore the influence of natural riverbed sand thickness on water yield of permeation pipe and the interaction between natural riverbed sand and artificial filter layer. Through physical model test, three kinds of natural river bed sand thickness, three kinds of inflow discharge and different water depth were set up to observe the permeation seepage pipe effluent under different conditions. According to the test results, the regression analysis was carried out. The error between the calculated water yield and the experimental value is less than ±5%, the absolute value of average error is only 0.19%, which is more accurate than the previous reference value algorithm. The change of water yield is related to the permeability coefficient of natural riverbed sand and artificial filter layer. When the permeability coefficient of natural riverbed sand is less than the minimum permeability coefficient of artificial filter layer, the water discharge from seepage pipe increases with the days. However, the thickness of riverbed sand decreases with the increase of the thickness of natural riverbed sand, on the contrary, it increases with the increase of the thickness of natural riverbed sand. The influence of permeability coefficient of filter layer on the discharge of seepage pipe is greater than that of head height. The method of regression equation improves the accuracy of permeation pipe outflow calculation, which can be used as guidance for practical engineering. In the design of permeation pipe intake project, the interaction between natural riverbed sand and artificial filter layer should be considered, and artificial filter layer should be selected reasonably according to the permeability coefficient and thickness of natural riverbed sand.
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Received: 30 May 2019
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