中文摘要：

薄壁堰是一种体型简单、经济实用、精度较高的量水设施，薄壁侧堰经常与小型渠道连接使用。目前对薄壁侧堰水力特性影响因素的研究还不深入，本文作者在矩形渠道薄壁侧堰试验研究的基础上，利用FLOW-3D软件对渠道侧堰进行了数值模拟计算，获得了不同堰高、不同流量条件下矩形渠道侧堰上、下游水面线、水深及流速分布，通过对渠道水面线实测值和模拟值的对比分析发现模拟值与实测值吻合较好，并对模拟结果进行了分析；根据试验数据拟合了流量公式。结果表明：模拟值与实测值的相对误差〈10％，两者具有较好的一致性，说明数值模拟具有一定的可靠性，可以为量水设施的工程设计提供参考和依据；拟合出的流量公式，最大相对误差为5．91％，最小相对误差为1．07％，满足精度要求。

英文摘要：

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 FlOW-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.