曾文-烏山頭水庫聯合運用規線僅規定總蓄水量之限水標準，並未設定曾文及烏山頭水庫的個別目標蓄水量，而不同蓄水目標及水庫的蒸發、庫容、輸水等限制影響，有不同的供水能力及發電量，因此，本研究希望透過優選烏山頭水庫不同期間目標蓄水量，致使曾文-烏山頭水庫聯合運用系統有最大收益。
　　本研究運用Chou與Wu (2010)發展之WRASIM模式建置曾文與烏山頭水庫水源聯合運用模擬系統，先分7個蓄水時期，以窮舉法列舉所有可能的烏山頭水庫目標蓄水位組合，模擬系統自民國64至104年的供需情形，一一比較其收益，再應用廊道搜尋法，逐步縮小搜尋範圍，直至找到最佳的水位組合。另外，利用BOBYQA以El.55m及El.57m為起始解以信賴域1000優選36旬水位，再將信賴域以間距200逐步減量遞減至200進行優選，求解各旬烏山頭水庫最佳蓄水位，使系統有最大收益並與窮舉法及36旬水位皆維持El.58m結果進行比較及探討。
　　結果顯示，採用BOBYQA優選法烏山頭水庫於第11至15旬優先蓄至水位約El.54m，其他旬優先蓄至約El.58m會有最大系統收益，雖然平均每年減少88.7萬噸供水量，但能增加曾文、烏山頭、西口電廠總發電量496萬度，供水及發電價值平均每年可增加926萬元新台幣之整體收益。

Existing operation rules for the Tsengwen and Wushantou reservoirs are controlled by total available water of both reservoirs without target storage for each reservior. However, evaporatation, capalicity of water deliver, reservoir storage and other factors will lead to the different system income with different target storage for each reservior. Therefore, this reaserch focus on determining the best target storage for Wushantou reservoir with maximum system income by simulation and optimal method.

This reaserch first uses WRASIM developed by Chou and Wu in 2010 to set up joint water resource system of the Tsengwen and Wushantou reservoirs. Then, simulate the system’s daily supply and demand from 1975 to 2015 with enumeration method by list all possible target water level for Wushantou reservoir. Beside, corridor investigation method is applied to decrease the range of investigation for finding the best target water level with maximum system income more efficiently. Finally, BOBYQA optimal method is used to find the best target water level with maximum system income by taking El.55.0m and El.57.0m as initial solution for every 36 ten days.

Reserch shows that, there is the maximum system income in searching by enumeration method when Wushantou reservoir takes El.55.7m from ninth to fourteenth ten days and El.58.0m for other ten days as target water level while Wushantou reservoir takes around El.54.0m from eleventh to fifteenth ten days and around El.58.0m for other ten days as target water level by BOBYQA optimal method. Altough the integalization of optimal solution for BOBYQA decreases 782.2 thousand tons of supply water for average year, it can increase the generation power of SHI-KOU, Tsengwen and Wushantou hydro power plant with total 4.96 million kilowatt-hours for average year. Total income for water supply and generation power is more NT 9.26 million dollars than now for average year.

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