| Summary: | 碩士 === 國立中興大學 === 水土保持學系 === 89 === Open dams are usually built with long rectangular openings and are easily blockaded by boulders. To solve this problem, this study investigated the downstream scouring response of an open dam with compound cross-section under various combinations of three opening types, three bed slopes, three flow discharges, and three sediment types.
Based on the flume experiments and regression analysis for the results, this study found that the relationship among scouring factors (i.e., maximum scouring depths, maximum length from the deepest point of the scouring pool to the dam, scouring length, energy dissipation rate, channel slope, diameter of bed-load sediment, and water run-through area) and concluded empirical formulas for their relationships.
Meanwhile, experimental findings indicated that the extreme scouring depth would increase with the flow discharge and channel slope, while mix sediments provided better armoring function for downstream channel bed. Besides, this study also discovered that the scouring length and energy dissipation rate would decrease with higher flow discharge and increased with steeper channel.
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