Abstract
Characteristic of topographic change around a single fence caused by currents isinvestigated through movable bed experiments. The maximum depth of local scouringunder the fence is determined by Shields' number and the width of the local scouring is 4 to 7 times larger than the maximum scouring depth.This types of fence has been constructed in the field with various plane arrangement. Based on the results obtained by from the single fence experiment, topographic changes around various plane arrangement of fences such as +shape are also examined. The depth and width of the maximum scouring hole is found to be almost the same as those of the single fence.
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