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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 1 - KEYNOTE AND INVITED LECTURES : Experimental Fluvial Processes and Numerical Simulation of Main Channel Induced By the Tributary of ...
Experimental Fluvial Processes and Numerical Simulation of Main Channel Induced By the Tributary of Debris Flow
Author : Su-Chin Chen, Chuan Tang, Szu-Hsien Peng and Chung-Chiang Li
The purpose of this study is to describe, based on the flume experiment, the tributary debris flow, which flowed into the main channel and deposited on the confluence. This study shows that the formation of the alluvial fan included two primary processes, which are separated by the appearance of the retrogressive deposition in the tributary. Dimensional analysis has been used to show the maximum deposition volume before the retrogressive deposition of the tributary. In the process of the retrogressive depositing, the sediment continues to flow into the confluence in three typical patterns to cause the expansion of the alluvial fan. Type I represents that sediment is swept to the alluvial fan by hydraulic jump. Type II represents that new debris flow which is formed above the mound of the tributary flows into the alluvial fan. Type ? represents that the alluvial fan is pushed by the mound of the tributary with stop and go motion due to the excess pressure behind. For Type II, the slope of the tributary, which remains the same, is proved by theoretical analysis. Meanwhile, using two-layer shallow water equations proceeded numerical simulation.
File Size : 3,232,529 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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