應用模擬退火法於QUAL2E模式參數最佳化之研究

Abstract

水質模式常被應用於分析涵容能力與水質管理計畫，QUAL2E模式為最常被採用之水質模式。本研究應用模擬退火法於QUAL2E水質模式參數最佳化之研究，並以頭前溪流域為研究區域，希望憑藉模擬退火法之搜尋能力，從眾多參數組合中，優選最適合研究區域之水質參數。本研究提出一簡易流量修正方式，以下游監測站之流量資料作為依據，對上游流量資料進行修正工作，使研究區域達成流量平衡。在實際參數優選工作上，本研究將研究區域分為三種不同的分區優選模式參數，並比較不同參數分區下參數優選與水質模擬結果之差距。經由本研究之結果顯示，模擬退火法確實具有優選水質模式參數之能力，能夠以模擬水質與實際觀測值之差值為依據，優選模式最佳化參數，且優選所得之參數，亦能合理的預測研究區域之水質濃度。

Water quality model is often used in developing pollution control plan and estimating the assimilative capacity. The QUAL2E is one of the most favorite water quality models. This study applies simulated annealing to optimize parameters of the QUAL2E model. The TouChen creek is chosen as a study area. For letting the model reaching water balance, the study proposes a measure to adjust the flow data before optimizing the parameters. In the process of parameter optimization, the study area is divided into three kinds of zonations and the results of different zonations are compared. According to the results, simulated annealing can successfully and efficiently identify parameters for the QUAL2E. The QUAL2E with optimized parameters can predict water quality reasonably.