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|標題:||Experiment on the scouring and deposition of sediment delivery with different flowing conditions.
|關鍵字:||discharge hydrograph;流量歷線;sediment discharge;flood raising and recession period;輸砂量;昇水段及退水段||出版社:||水土保持學系||摘要:||
If the torrent control works will be used to reach its time-limit, it is necessary to make an estimation of sediment discharge and to estimate the variation of scouring and deposition. And steady flow experiment will neglect the sediment delivery effect of raising period and descending period in unsteady flow.
Therefore, a flume experiment was conducted to measure the sediment delivery and to observe the variation of scouring and deposition with different flowing conditions in order to compare the difference of steady and unsteady flow in this study.
According to the experimental results, under the same discharge, during the initial raising period until the ending of recession period ,the sediment discharge of raising period in unsteady flow was larger than the equilibrium period in steady flow; and the sediment discharge of equilibrium period in steady flow was larger than the recession period in unsteady flow. And the scouring volume per unit width measured in unsteady flow was 1.06 times of the estimation from steady flow experimental results and discharge hydrograph of unsteady flow; the deposition volume per unit width measured in unsteady flow was between 0.69 to 0.77 times of the estimation from steady flow experimental results and discharge hydrograph of unsteady flow.
|Appears in Collections:||水土保持學系|
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