本研究以水理模式CCHE2D 探討滯洪沉砂池出水口、入水口位 置及滯洪沉砂池尺寸對於泥砂沉降區域之影響，藉由滯洪沉砂池內流 速、砂粒落淤位置與囚砂量多寡等各因子，作為判斷滯洪沉砂池效益之 依據，在設計階段以CCHE2D 預估泥砂沉降位置，透過不同滯洪沉砂池 設施尺寸及出水口、入水口位置試驗研究結果進行分析與討論，藉以提 高滯洪沉砂池效率的目的，最後得出之研究成果，以供後續設計者與研 究者對於沉砂池設計參考。

This study used CCHE2D to analyze the sediment deposition in detention and deposit ponds. The influences of positions of the inlet and outlet and shapes of the ponds were investigated. The flow velocities, areas of sediment deposition, and amount of sediment deposition were used as indicators to evaluate the efficiencies of the detention and deposit ponds. In the design process, CCHE2D was used to predict the sediment deposition. Then, positions of the inlet and outlet and shapes of the ponds were modified to improve the efficiency of sediment deposition. The results were expected as references of designing detention and deposit ponds for following designers and researchers.