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The Scour and Deposition of Main Channel Induced by the Tributary Debris Flow
|關鍵字:||土石流;Debris flow;輸砂;交匯機制;堆積扇;泥砂;Sediment transport;Junction mechanism;Alluvial fan;Sediment||出版社:||水土保持學系||摘要:||
The purpose of this study is to describe the tributary debris flow which flow into the main channel and deposite on the confluence, based on the flume experiment. In the tributary, the dry sediment and water were mixed to form the debris flow. This study shows that the formation of the alluvial fan included two primary processes which are separated by the apperance of the retrogressive deposition in the tributary outlet. In the process of the retrogressive depositing in the tributary, there are three typical patterns that the sediment continued to flow into the confluence to cause the expansion of the alluvial fan.
TypeI:Sediment was swept to the alluvial fan by hydraulic jump.
TypeII:A new debris flow which was formed above the mound of the tributary flowed into the alluvial fan.
TypeIII:As the excess pressure behind, the alluvial fan was pushed by the mound of the tributary.
The formation of Type III was analysed and discussed. The method which estimate the debris flow discharge in Type II was purposed. Finally, dimensional analysis is used to show the maximum deposition volume before the retrogressive deposition of the tributary appeared.
藉由實驗觀察結果，經由理論分析提出Type II型新土石流入匯堆積扇頂部之流量計算方法；探討Type III型發生的原因與規律性；最後，藉由因次分析方法，分析支槽發生溯源淤積前主槽最大淤積泥砂量，提出一估算公式。
|Appears in Collections:||水土保持學系|
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