潮流模拟中平面紊动黏性系数及动边界处理的影响

Influences of horizontal turbulent viscosity coefficient and moving boundary treatment on tidal current simulation

利用实测资料计算不同平面紊动黏性系数下的潮流场,并就湿地特性动边界处理技术中3个主要参数独立变化情况下的潮流场作了进一步模拟;在此基础上,比较分析了紊动黏性系数及湿地特性中各参数对潮流场断面流速分布及沿程潮位变化的影响,同时,对湿地特性中各参数的合理取值进行了探讨.结果表明,紊动黏性系数愈大愈具有均匀断面流速分布及阻水的作用,实际数值计算中应以H3=0.01作为取值的上限,而其他2个参数的选取应以实际底床组成及地形变化等作为参考进行取值为最佳.

The tidal current fields with various horizontal turbulent viscosity coefficients were calculated using the measured data. The tidal current fields with the independent variation of three parameters of wetland properties in the moving boundary treatment technology were further simulated. On such a basis, influences of the turbulent viscosity coefficient and wetland properties on the velocity distribution and water level profile of the tidal currents were compared and analyzed. The rational values of parameters of the wetland properties are discussed. The test results indicate that the larger the turbulent viscosity coefficient, the more uniform the velocity distribution and the more water blocking action, and H3 = O. 01 should be selected as the upper limit in actual simulation while the other two parameters of the wetland properties should be chosen based on actual parameters such as the composition of bed material and topographical variation.