碩士 / 逢甲大學 / 水利工程與資源保育學系 / 102 / In Taiwan, reservoirs and check dams were constructed for effective uses of water resources because of high population density, topographic characteristics, and temporally-spatially non-uniform rainfall distribution. However, many structures have lost the original functions and ecological consciousness has been increased such that dam removal projects were proceeded. To understand the channel responses after dam removal, this study applied several numerical models to discuss the effects of replacing sediment of Chichiawan Creek Dam No. 1 in different sites on the Weighted Usable Area of Formosan Landlocked Salmon.
First, the study applied CCHE2D to simulate the channel morphology for the condition after replacing dam sediment into the river. With the Habitat Suitability Index of Formosan Landlocked Salmon, Two-Dimensional Depth Averaged Model of River (River2D) then was utilized to identify the Weighted Usable Area (WUA) effects of replacing dam sediment in different sites. The research results show that the usable area ratios of the downstream of dam reach have obvious increase at the regular discharge when replacing dam sediment near this area. Under ecological base discharge, the usable area ratios of the downstream of dam reach have apparently increased when replacing dam sediment away from this area. In the valley, the usable area ratios will not be affected by replacing sites.
| Identifer | oai:union.ndltd.org:TW/102FCU05398013 |
| Date | January 2014 |
| Creators | Wai-yi Lai, 賴威儀 |
| Contributors | Chao-hsien Yeh, 葉照憲 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 100 |
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