动床模型试验中存在问题的辨析

在动床模型试验中，一般用散粒料来模拟受冲刷的岩基，造成模型河床的糙率偏大、河床潜流影响严重等问题，使得模型测试的水面线与实际水面有一定偏差。本文根据近年来笔者做的几个动床模型，阐述了动床试验存在的几个问题，以及由此产生的模型测试方面的某些误差，并对模型试验的准确性进行了论述，以期对同类模型试验提供借鉴。

A DISCUSSION ABOUT A FEW PROBLEMS THAT EXISTING IN THE MOVABLE BED MODEL EXPERIMENTS

In experiment of a movable bed, it is general to use scatter grain simulating the batholith washed by water. This will take forth problems such as bigger roughness coefficient, more serious submerged discharge impact of a river bed, therefore this will arose a water surface profile gap between that tested on model and that on natural river. According to the experiments of movable that author has done, the present paper indicated the problems occured in movable bed experiments and some gap occured afterwards. Then of the model simulation experiment was discussed. These will only has a vcdus of reference to the same kind of simulation movable bed experiments.