STADY ON BOUNDARY MIXING COEFFICIENT IN COMPOUND CHANNEL

Abstract

The article discuses about the boundary mixing coefficient in compound channel.

The boundary mixing coefficient is important parameter calculated by quasi two-dimensionnal shallow water analysis. However, a rational calculated method had not been established.

To evalate relevancy between the boundary mixing coefficient and characteristics of the stream, the boundary mixing coefficient was figured by analytical calculation.

As a result, it became clear that the boundary mixing coefficient is relative to the water depth/hight of the flood plain and roughness coefficient.

Based on these results, it was assured that the equation is related with the water depth/hight of flood plain and roughness coefficient, and it enables to obtain the accurate water level calculated by quasi two-dimensionnal shallow water analysis.