Abstract
Natural vegetation plays important roles on river environment. It is needed to find the way of managing vegetation aiming at the harmony between flood control and environment. Considering the vegetation as groins, we studied the flow and bed topography around permeable groins to determine the structure and arrangement of vegetation groins from the standpoint of both flood control and environment.The experiment showed that the groin interval to length ratio, L/D=2.0 and groin height to water depth ratio, hg/h=0.90 gave good representation for flood control and environment. The three dimensional numerical model provided good explanation for experimental results of the flow and bed topography in the channel with permeable groins in series.
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