闸下淤积是长江感潮河段通江泵闸面临的突出问题之一，在通江泵闸改扩建与新建阶段，统筹解决闸下淤积是亟待突破的关键技术难点。为识别闸下淤积的主控因素与动力机制，以上海浦东北横河泵闸工程为例，基于实测资料分析和三维水沙数学模型等手段，对不同布置方案的水动力与河床演变进行模拟分析。结果表明，长江感潮河段通江泵闸工程不同的平面布置对其河道水动力特征与淤积控制效果差异显著，控制闸下淤积的核心因子为闸前水流顺直段长度与闸下较高流速区覆盖范围。根据泵闸平面布置、地形和边界条件的适配性，开展水沙动力模拟，可为长三角地区同类型通江泵闸的新建与改扩建工程提供普适性设计准则。

[Objective] Sedimentation at the downstream of sluice gates severely constraints the drainage capacity of pumping sluices in the tidal reaches of the Yangtze River，and also raises dredging costs. This study seeks to elucidate the causes and find solutions for the sedimentation of pumping sluices by optimizing their layouts to improve regional drainage capacity and river hydrodynamic condition. [Methods] The Beiheng River Pumping Station and Sluice Project in Pudong New Area，Shanghai was taken as a case study. Numerical simulations and analyses of the engineering effects under different layout schemes were conducted using measured data analysis and a three-dimensional hydrodynamic-sediment mathematical model. By comprehensively comparing the flow patterns，velocity distributions，and erosion-deposition results of each layout scheme，the planar layout of the Beiheng River project was evaluated. [Results and Conclusion] （1） Different planar layouts of pumping station and sluice projects in the tidal reaches of the Yangtze River result in significant differences in hydrodynamic characteristics and sedimentation control effectiveness. （2） The length of the straight flow section upstream of the sluice and the coverage area of the high-velocity zone downstream of the sluice are the core factors controlling sedimentation downstream of the sluice. （3） By adapting the planar layout of the pumping station and sluice to local topography and boundary conditions，hydrodynamic-sediment simulations can provide universal design guidelines for the construction and renovation of similar river-connected pumping stations and sluices in the Yangtze River Delta region. This is of great significance for enhancing the flood control resilience of coastal urban clusters and advancing the modernization of water management systems.