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| Experimental study on hydraulic characteristics of rectangular water-diversion |
| LIU Haiqiang, WANG Wen′e*, HU Xiaotao |
| Key Laboratory of Agricultural Soil and Water Engineering, Northwest Agriculture and Forest University, Yangling, Shaanxi 712100, China |
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Abstract An experimental study was carried out on the rectangular channel water separation with a side weir under the different channel width ratios. Five kinds of flow were selected in the experiments. Under each flow rate, the different diversion ratios were obtained by adjusting the downstream water depth of the main channel. A total of 75 groups of experiments were carried out. The water depth and other hydraulic factors near the water diversion were measured, and the water surfaces near the water diversion were obtained. According to the weir flow formula, the relationship between the discharge coefficient and the head of the relative weir is fitted at each channel width ratio. The results show that the variation of water surfaces at the water-diversion are approximately the same under different flow rates, and the water surface change is different with the distance from water-diversion. Under the same channel width ratio and the flow rate, the diversion ratio is linearly related to the water head on the relative weir, and increases with the increase of the relative water head on the weir and decreases with the increase of the Froude number of the main channel upstream and downstream. The accuracy of the calculated formula of the flow coefficient is higher and the correlation coefficient is more than 0.9, which meets the accuracy requirement of flow measurement. A preliminary study on hydraulic performance at the water-diversion was carried out, in attempt to provide reference for discharge measurement in irrigation areas.
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Received: 14 May 2018
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