臺灣目前水庫興建上已趨於飽和，加上近幾年環保意識提升，透過建造水庫來提升總蓄水量已經不是優先選項，勢必得將目光放在如何使現有水庫達到永續發展，早年間建造的水庫多半面臨庫容銳減的問題，目前主要透過工程手段更新水庫現狀及調整排砂方式來處理，維護水庫庫容較有效且成本較低之方法為水力排砂，而水力排砂效果的高低取決於水庫幾何條件、淤砂粒徑、泥砂淤積型態、水流流量及水深等。在眾多水力排砂方式中，空庫排砂之排砂對維持水庫庫容效果最好(Chaudhry, 2014)，而阿公店水庫於2005年更新工程完成，其透過泥砂管理來逐漸緩和淤積的情形，為臺灣少數採用空庫排砂的水庫，若能夠深入探究空庫排砂應用於臺灣水庫的影響，將更能夠完善整體水庫泥砂管理策略。
濁水溪的產砂一直是阿公店水庫的主要砂源，水庫管理單位每年於空庫防淤期間會在庫區內挖設一條沖砂渠道，自濁水溪匯流口延至溢洪道出口，目的在於將濁水溪產生之高濃度濁水迅速帶往溢洪道，減少泥砂於庫區內落淤的情形。因此，本研究主要探討兩條不同位置的沖砂渠道對於庫區內排砂效率的影響情形，於模式中透過渠道的單一及複合設置，分別包含(1)現有沖砂渠道；(2)舊存沖砂渠道；(3) 兩沖砂渠道並用，共計三種策略，搭配低水位、中水位及高水位事件，來探討不同的情境下，對庫區泥砂的影響與排砂效率之關係。
綜觀各種排砂效率模擬結果，事件中庫區水位高度對排砂效率的影響，遠大於不同渠道布設策略的結果，因此，當水位低於31 m時，運用「現有沖砂渠道」策略能達到最好的排砂效率，當水位介於31 m至32 m之間時，則運用「兩沖砂渠道並用」策略達能夠到最佳的排砂效率。

Taiwan's current reservoir construction has reached a saturation point. Older reservoirs often face issues with reduced storage capacity, which is primarily addressed through engineering methods to update the reservoir’s condition and adjust sediment flushing methods. Hydraulic flushing is a more effective and cost-efficient method for maintaining reservoir capacity. The effectiveness of hydraulic flushing depends on geometric conditions, sediment grain size, sedimentation patterns, flow rate, and water depth. Among various hydraulic flushing methods, empty flushing is the most effective for maintaining reservoir capacity (Chaudhry, 2014). The Agongdian Reservoir, which completed its updating project in 2005, uses sediment management to gradually alleviate sedimentation issues and is one of the few reservoirs in Taiwan employing empty flushing. Delving into the impact of empty flushing on Taiwanese reservoirs could further refine overall sediment management strategies.
The sediment from the Zhuoshui River has always been a major source for the Agongdian Reservoir. Each year, during the sediment prevention period when the reservoir is empty, a flushing channel is excavated from the confluence of the Zhuoshui River to the spillway outlet to quickly direct the high-concentration turbid water away and reduce sedimentation in the reservoir area. This study investigates the effects of two different flushing channel locations on sediment release efficiency. The model examines single and combined channel setups, including (1) the existing flushing channel; (2) the old flushing channel; and (3) the use of both channels, across three strategies with low, medium, and high water levels to explore the impact of different scenarios on sediment release efficiency.
Based on the simulation results of sediment release efficiency, the impact of reservoir water level on sediment release efficiency is significantly greater than the effect of different channel layout strategies. Therefore, when the water level is below 31 m, using the "existing flushing channel" strategy achieves the best sediment release efficiency. When the water level is between 31 m and 32 m, the "using both flushing channels" strategy provides the optimal sediment release efficiency.

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