The Chenyulan river morphology change induced by Shenmu watershed sediment yield
| Autor: | Shao-Chien Chen, 陳少謙 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Landslide and debris flow events were induced by fragile geology and the high-intensity long-duration rainfall during typhoon seasons since Typhoon Herb in 1996 in the region of Chu-shui creek, Huo-sa creek and Ai-yu-zih creek in Sheng-mu village, Taiwan. Channel conditions such as sediment yield and width of river section are important issues in analyzing river morphology. Behaviors and characteristics in chenyoulan river were infected by amount of sediment input due to typhoon events in recent decade. Therefore, this study analyze the yield of landslide event and discuss the changes between scour and deposition in chenyoulan river, Chu-shui creek, Huo-sa creek and Ai-yu-zih creek. By analyzing the relationship between landslide location and landslide magnitude and estimate the sediment yield induced by landslides in basin area, this study proposed a method to comply the surmise. Result showed that landslides location in this area were generally near the stream instead of the ridge. In order to get the trend of river morphology influenced by sediment input, the study recommended braided index to analyze the plane forms of river channel. It showed that after landslides and debris flow events, the sediment cause by landslides were deposited in river channel. During the process, the width of channel could increase, so did the braided index. Like the result of this, the self-adjustment of river channel will lead the river form as braided river because of amount of sediment input. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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