Abstract
The methods, in which the cross sections of the flow were divided into several regions, have been applied for prediction in distribution of velocity and water level in a compound sectional channel and a regular cross-sectional channel with locally varied resistance zone. In this paper the resistance zone is assumed to be composed of pile series arranged like vegetation belt or rough stone zone. In the previous methods, lateral distribution of velocity was estimated on the basis of the assumption of uniform flow condition. But the assumption cannot be applied to calculation of non-uniform flow. Because the assumption implies that lateral distribution of velocity has a similar shape in all cross section of overall flow region in spite of non-uniform flow. We give the proof of the above mention and propose a new calculation method for prediction of velocity distribution, in which the assumption of uniformflow condition is not used. Longitudinal water level can be predicted by using the velocity and energy gradient obtained from the calculation of velocity distribution. This calculation method of longitudinal water level will be also made clear in this paper.
The applicability of this calculation method is assured by the results obtained from the experiments in the regular cross-sectional channel and the compound sectional channel with pile zone on the several conditions.
