It is necessary to be clear about the flow behavior in rivers influenced by the existence of trees and grasses on the flood plain. In this research, using a skewed compound channel with a group of trees on the flood plain, the behavior of flow in the main channel and the flood plain is studied. Authors' considerations are directed to phenomena due to the difference of arrangement of trees on the flood plain along the main channel. According to these experiments, if the arrangement of trees is changed for some reason, the flow in the skewed part changes in direction and scale. As a result, for maintenance of a river it is necessary for some notice to be taken of changes in this arrangement.Numerical analysis is used in an attempt to simulate the phenomena in the compound channel. In the analysis, the 2-D shallow water theory is adopted for simplification.
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