丁坝对弯道水流特性影响的数值分析

Numerical Analysis on the Effects of Spur Dikes on Flow Characteristics in Bend Channel

针对丁坝对弯道水流水力特性影响的问题,建立了相应的概化模型,通过数值模拟的方法研究了不同角度下丁坝对弯道水流特性、弯道水流横向水面超高和流速场的影响。结果表明,在丁坝影响下,弯道水流横向水面横比降计算公式应考虑丁坝对河道的束窄、丁坝尺寸和弯道角度等综合因素的影响进行修正,为深入探讨弯道水流特性奠定了基础。

According to the problem of the effects of spur dikes on flow characteristics in bend channel, this paper establishes the generalized model to simulate the influence of spur dike on flow characteristics, lateral superelevation of the water surface and velocity field in bend channel under different angles through the numerical simulation method. The re- sults show that under the effects of spur dike, the formula of the lateral superelevation of the water surface need to be amended, and a reasonable formula for the lateral slope of the water surface should take into account the effect of spur dike on the river＇s narrow beam, spur dike size, bend angles and other comprehensive factors, which laid the foundation of further research on the bend flow characteristics.