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Transport of Nonuniform Gravel and Channel-Bed Evolution
本研究針對台灣天然陡坡河川之特性，進行礫石輸移率之渠槽試驗。參考前人之研究，試驗設計採用固定級配與單寬流量，四種起始坡度(S=2 ~ 5 %)，含超載減載共計4組試驗。整個試驗係於國立中興大學土木工程研究所渠道輸砂試驗室進行。
Most of mankind lives beside rivers. The rise or decline of civilization is related to the evolution of rivers in that area. An understanding of the nonuniform gravel transport mechanism and the change of river-bed is very helpful to many engineering applications such as watershed management and the soil and water conservations. A series of experiment were conducted to study the sediment transport rate of nonuniform gravel for mountain rivers with steep gradients. With consideration of the existing data, the experimental design adopted a fixed particle size distribution and a constant flow discharge, four levels of slope, which amounted to four experiments for both overloading and underloading conditions. All experiments were carried out in a steep flume in NCHU. Based on the experimental data, the temporal variations of sediment transport rate, sediment size, bed profile and Manning''s n value were analyzed. It was found that the sediment size of surface bed material decreased with time at a fixed location for the overloading experiments with steep slope gradients. The phenomenon was similar to the experimental results of Solar et al. (2000). A one-dimensional numerical model was performed to simulate the evolution of the bed profiles. Both the overloading and underloading conditions can be simulated with the model. However, the mechanism of the variation of bed material size has to be incorporated into the model in the future in order to simulate the more complicated natural river evolutions.
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