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| Experiment of hydraulic scouring characteristics of thin water in Pisha-sandstone |
| CHANG Ping,LI Xiaoli*,LI Mingyu,CHEN Suhang,WU Shangyun |
| College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China |
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Abstract Using the indoor sink that can adjust the slope and selecting the five slopes(5?,10?,15?,25?,35?)and five flows(280,420,550,650,900 L/h), we simulated the indoor thin water flow scouring test. The results show that when the slope is constant, the erosion rate increases with the flow rate, and the growth rate is affected by the slope. There is a critical slope value between 15? and 35?. In the absence of rainfall, at less than the critical slope, the erosion rate and energy slope between meet the polynomial relationship. During the erosion, the flow of the thin layer of the slope belongs to the rapid current in the laminar flow. The generation of the erosion rill is related to Fr and Re. When the slope is less than 10?, the shear stress and the flow power are not affected by the flow rate. When the flow rate is less than 420 L/h, the slope effect is not particularly obvious. The effect of the slope on the flow rate is greater than that of the flow, resulting in the fact that the slope has a greater impact on the unit water flow. The effect of single width flow and energy slope on the erosion rate is large. And the fitting model of erosion rate is established. This model can meet the large angle scouring of Pisha-sandstone.
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Received: 02 November 2017
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