明渠清水定床模型试验方法的比较与应用

Comparison and Application of Model Experiment Method in Open Channel with Fixed Bed and Clear Water

在几何相似条件下按重力相似准则设计的阻力相似模型，当模型中的表面糙率系数达不到要求时，建议采用流量变态法（亦即改变流速比尺法）进行试验；采用流量变态法时模型中所应施放的流量可通过一个简单公式进行快速计算而得到．由此而得到的模型试验水位成果可直接换算到原型中去．

Under the geometrical similarity condition,in a resistance force similarity model which is designed according to the criterion of gravitational force similarity,if the surface roughness coefficient of the model can not satisfy the requirement,we suggest adopting the distorted discharge method,i.e.changing water velocity scale to test.The discharge of the model can be calculated with a simple formula.So the water level in the model can be direclly converted into that of the prototype.