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《Journal of Hydroelectric Engineering》 2016-01
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Experimental and numerical studies on hydraulic characteristics of sharp-crested side weirs in rectangular channels

WANG Yingying;WANG Wen'e;HU Xiaotao;WANG Jiawei;College of Water Resources and Architectural Engineering, Northwest A&F University;  
Sharp-crested weir, often installed at the inlets of small open channels, is a simple, economic and practical device for high-accurate water measurement, but current understanding of its hydraulic characteristics is not deep enough. In this study, we have investigated the hydraulic characteristics of a sharp-crested side weir using the CFD code of Fl OW-3D in combination with our experimental tests, and obtained hydraulic parameters for different weir heights and different flow conditions. Water surface profiles were simulated and compared with experimental measurement. A formula for discharge was derived from the test data. The results show that the relative error between the measured and simulated values was lower than 10%, indicating a good agreement between these two methods. The fitted formula has a satisfactory accuracy of relative error range of 1.07% ~ 5.9%. Thus, the numerical results would lay a theoretical basis for design of water-measurement devices.
【Fund】: 公益性行业(农业)科研专项(201503125);; 国家自然科学基金(51179163)
【CateGory Index】: S277
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