水利設施的營運可以提供人類用水方面如供水、發電及防洪等具經濟效益的需求，但水利設施攔蓄及引取河川流量不僅改變河川的天然流制，甚至影響水域生態環境，因此如何設計兼顧人類需求且維護水域生態環境的水資源管理策略是目前重要議題之一。近年來多數的水資源管理策略會在水利設施下游維持一定程度的環境流量來維護水域生態環境，目前普遍認為環境流量的設計除了須考慮量的大小外，亦要具有一定的變異性，本研究將設計多層次環境流量來達到此目的。本研究將以新店溪流域為研究區域，新店溪流域目前有七座大小型堰壩供應大台北地區生活用水，並兼具水力發電及防洪等功能，雖然該流域之部分水利設施有維持固定的環境放流量，但皆為個別考量，而非流域性整體策略。本文研究重點為綜觀整體流域內各河段受堰壩引水的影響，在兼顧用水、發電、防洪的效益下，搭配各項人類用水指標(供水指標、發電指標及防洪指標)與流域天然流制指標(洪水頻率指標、年最小7日流量指標、月流量歷線指標及流量變異係數指標)，以尋求減緩各河段受改變程度的最佳整體營運策略。經應用於北台灣之新店溪流域，本文比較無保留環境流量方案、現況方案及本研究所計算的最佳方案，分析結果顯示本文所建議之整體最佳策略相較其他方案對於各河段受影響的流制有甚大的改善，惟人類用水效益略為降低。

Water-resources facilities operation provides economic reward for human society, but may alter natural flow regime and deteriorate riverine health. It becomes a challenge task of water-resources management to find a strategy simultaneously meeting human and environmental water needs. In this study, a multi-level environmental flow is incorporated into a basin-scale simulation model and applied to Hsintien Creek basin located in northern Taiwan to achieve this goal. Two types of indicators comprise human indicators (water-supply, hydropower production, and flood peak attenuation) and environmental indicators (frequency of small floods, annual minimum 7-day flow, monthly flow hydrograph, and coefficient of variation for daily flow) are used to derive the optimal operating strategy. The results show that the current scenario is slightly better than the no environmental flow scenario. The optimal scenario has great improvements in altered natural flow regime, but at a cost of deterioration of human indicators.

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