https://scholars.lib.ntu.edu.tw/handle/123456789/86164
標題: | 行政院國家科學委員會專題研究計畫成果報告:鮭魚產卵礫石河床最佳沖淤水流之研究 | 作者: | 吳富春 | 關鍵字: | 模式模擬;沖淤水流;多目標系統;協商值;非劣勢方案 | 公開日期: | 2003 | 出版社: | 臺北市:國立臺灣大學生物環境系統工程學系暨研究所 | 摘要: | 本研究利用礫砂河床沖淤數值模式探討非劣勢沖淤方案與其協商值。模擬結果顯示沖淤 效率隨流量而增大,但流量超過100m3/s後流量之敏感度降低,沖淤系統可簡化為雙目標系統。 礫石損失量與沖淤水體積為互斥結果。當河床泥砂條件較差時,可行方案較為受限並且花費 較高。本研究將互斥結果之協商值以目標空間可行解方式量化呈現。 A simulation approach to evaluating flushing flows and exploring the tradeoffs associated with noninferior flushing options is presented. A two-fraction sediment routing model is used to simulate the gravel-sand bed response to flushing flows. A series of numerical simulations are carried out with a range of flows and pre-flushing bed sediment conditions. The results reveal that the flushing efficiency is higher for the larger flow. However, for flows greater than ~100 m3/s the flushing duration is less sensitive to the flow discharge, thus the system may be simplified as a bi-objective one. The gravel loss and water volume are two conflicting outcomes within the noninferior flow region. Under a worse bed sediment condition, the feasible flushing options are constrained in a narrower range and also associated with higher costs. The tradeoffs between the conflicting outcomes are quantitatively displayed with the transformed feasible solutions in the objective space. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/10749 | 其他識別: | 912313B002340 | Rights: | 國立臺灣大學生物環境系統工程學系暨研究所 |
顯示於: | 生物環境系統工程學系 |
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912313B002340.pdf | 154.48 kB | Adobe PDF | 檢視/開啟 |
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