Study on Methods for Determining Location and Construction Timing of Dynamic Interference Sediment Reduction Measures for Strong Siltation Harbor Basins

This study proposes a systematic decision-making framework for optimizing the location and construction timing of dynamic interference sediment reduction measures in heavily silted harbor basins. The methodology integrates hydrodynamic modeling, sediment transport analysis, and construction process optimization to minimize engineering costs while maximizing the efficiency of sediment reduction. The core principle involves leveraging hydrodynamic and sediment transport dynamics to identify critical intervention points (location) and favorable construction windows (timing). Taking the southern harbor basin of Jiangsu Yancheng Binhai Port as a case study, the Lagrangian particle tracking method is used to analyze particle transport pathways in different areas during various tidal phases. The results show that in the southern part of the harbor basin, disturbed suspended sediment can be effectively transported out of the basin during most of the tidal cycle, with only about 2.5 h per tidal cycle being unsuitable for operations; thus, this area is identified as the optimal operation location. In contrast, the central area is dominated by a vortex that prevents sediment from being flushed out within a short time, making it unsuitable for sediment reduction operations. Although the northern area cannot fully export sediment within a single tidal cycle, it can rapidly convey sediment to the southern area, where sediment can be removed through relay operations over multiple tidal cycles. This study provides a quantitative method for determining optimal operation locations and construction timing for dynamic interference sediment reduction technology in heavily silted ports.