北港溪為中央管河川，其支流部份河段歷年淤積現象屢現，對於河防安全、自然環境造成相當之影響。因此，於考慮河防安全，並兼顧利用河川中有限之砂石資源的前提下，擬對較嚴重淤積河段進行疏濬作業。惟該等作業對於河川輸砂平衡勢必造成影響，因此本研究計畫第一年度針對淤積成因進行分析探討輸砂特性變化，以瞭解河道長期穩定趨勢，第二年度進行疏濬方案研擬分析，於兼顧河防安全及自然環境條件下，提出整體河床穩定與河道治理對策。

Beigang River is administered by the central government. Repeated sedimentations can be seen in its branches over the years, which impact river safety and the surrounding environment. Therefore, considering river safety and the use of the river’s limited sand and gravel resources, dredging operations are planned for the river branches with serious levels of sedimentation. However, the dredging operations will inevitably influence the river’s sediment transport balance, so this study plans to evaluate the factors contributing to river sedimentation, and discuss the characteristics and changes in sediment transport to obtain a better understanding of the long-term stability of the river in the first year. In the second year, the dredging project will be further developed and analyzed to propose a solution that comprehensively stabilizes the riverbed and corrects the river, while preserving safety and the natural environment.