Limiting scour depth in water cushion pools produced by multiple jets;

A hydraulic model was developed to analyze the interaction between two interactivity jets to reduce the scour depth due to jets from high arch dams.

The turbulent jet theory and water flow momentum equation are used to establish the mathematic model for calculating bedrock scoured balance depth of river bed under the action of left-right collision of water jet from high arch dam in considering 3-D diffusion,leakage collision flow and collision energy losses of water jet dispersion in the air.

In this paper, the process of limited scour is observed and analysed.

The examinational study on the local scour depth of roadbed along river;

Research on local scour depth calculation of roadbed along river;

Investigation on characteristics and scour depth of flow in river bend;

Estimation method of scouring depth of lower reach of hydro-junction;

Discussion the scouring depth recommended by "Levee Engineering Design Standard";

Based on this research,the model nearby superposed flow spur and the velocity distribution of spur head flow were built,At last,a theoretical formula of scouring depth around pile permeable spur dike was derived from the models.