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標題: Numerical Simulations and Parametric Studies on Flume Experiment of Debris Flow
作者: 何世勝
關鍵字: Numerical Simulations;土石流;Parametric Studies;Flume Experiment;數值模擬;水槽試驗
出版社: 水土保持學系
This study collected and analyzed large quantities of the experimental results of flume test for the comparisons with numerical simulation. A series of parametric studies were performed to investigate the effects various experimental parameters such as the slope of flume, inflow discharge, materials type of sediment and in-stream transverse structure on the motion and deposition behaviors of debris flow.
In spite of some underestimations and deviations were found in the numerical simulations as compared with the experimental measurements, the prediction trends are generally coincident with measurements. Parametric studies indicate that the motion and deposition behaviors of the monitoring point at floodplain adjacent to the flume outlet has great influence on the subsequent overall simulation of those monitoring points along the downstream of floodplain. As the slope of flume increases, the deposition expands and causes the decrease of deposition depth. Meanwhile, it was found that the transverse flow and expansion at the outlet of flume is relatively insignificant. For a specific range of inflow discharge (0.1~0.01cms), the deposition depth is approximately proportional to the inflow discharge.
Water is susceptible to separate from the mixture of gravel-type debris flow and it eventually results in a decrease of flow velocity. The moving distance of flowing mass is relatively short in gravel-type debris flow which frequently displays a strong impact force during the flow motion. On the contrary, the clay-type debris flow possesses high capabilities of water retention, flow mobility and transverse expansion.
In addition, according to the numerical results, for in-stream transverse structure (such as check dam) with specific height and layout location, it can be found that the sediment retaining rate offered by the structure can reach 68.47% and the deposition area can be reduced to 41.82% of that without transverse structure. In conclusion, this study verifies the feasibility to evaluate the sediment retaining rate of in-stream structure using numerical simulation procedures.

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