植生繁茂条件の違いが開水路流れの抵抗特性に与える影響

概要

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Vegetation community are often observed to grow in stripe pattern or patches within many stream channel. It is necessary to predict or understand stage-discharge relationships and velocity distributions in partially vegetated channel for enhancements of flood protection and river environment. In this paper, the influence that difference of vegetation density and arrangement patterns of vegetation zone gave to the flow resistance in an open-channel was examined experimentally. The flow velocities were measured by stage gauge using a two-component electromagnetic current-meter. Results showed that the relationship between flow depth and discharge significantly depended on the vegetation density and arrangement patterns. The reason could be explained by the difference of momentum transport from the relatively fast flow in non-vegetated zone to the slow flow within the vegetated zone.
2012-03-21