吳富春2006-07-252018-06-292006-07-252018-06-292003http://ntur.lib.ntu.edu.tw//handle/246246/10749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.application/pdf158188 bytesapplication/pdfzh-TW國立臺灣大學生物環境系統工程學系暨研究所模式模擬沖淤水流多目標系統協商值非劣勢方案reporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/10749/1/912313B002340.pdf