潮汐流动平均离散的分析与计算

利用二维潮汐流动纵向流速任意分布下离散系数的计算公式，对几种典型的流速分布建立了潮平均离散系数D_us与分时段按恒定流处理所得的潮平均离散系数D_s之间的关系。通过水槽试验对计算结果进行了定性验证。把这种方法应用于珠江，根据实测的流速分布资料，由恒定流的剪切离散结果获得了广州河段潮平均的离散系数。

THE ANALYSIS AND CALCULATION OF AVERAGE DISPERSION IN TIDAL FLOW

In this paper using the formula of dispersion coefficient in two dimensionnal tidal flow with arbitrary velocity distributions, the relation of, average tidal dispersion coefficient for unsteady flow, and, average tidal dispersion coefficient derived on the basis of steady flow in each time segment, is obtained in case of some typical velocity distributions. The calculating results are qualitatively verified through the flume tests. This method is applied to calculate the average tidal dispersion coefficients of Guangzhou reach in pearl River according to the field data of velocity distribution and calculations of the shear dispersion for steady flow.