Identification of Roughness in Compound Channels

An accurate estimation of roughness coefficients is of vital importance in any open channel flow study. In flood routing in natural rivers, most channels have compound sections and the roughness values in main channel and flood plains are usually different. In order to have more accurate results, the roughness of main channel and flood plains should be considered separately. It is possible to identify the values of roughness using optimisation methods. However, studies on the inverse problem of estimating roughness values in compound channels are still limited.