2002-08-012024-05-14https://scholars.lib.ntu.edu.tw/handle/123456789/660269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。<br> Abstract: 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.模式模擬沖淤水流多目標系統協商值非劣勢方案Model simulationflushing flowmultiobjective systemtradeoffnoninferior option