基于淤泥颗粒在水中的受力情况和管道射流基本理论，建立了适用于堆场淤泥颗粒的基本运动方程，得到了淤泥颗粒的沉降速度分布图、水平管道射流各断面上的速度分布图和不同断面处轴向速度分布图。通过拟合淤泥颗粒在堆场中沿垂向、轴向和径向的运动规律，构建了堆场主沉降区内淤泥颗粒粒径范围从0.35～300 μm沉降历时17 h的分层沉降模型，大致模拟出淤泥沉降规律。淤泥颗粒粒径呈现扇形分布，沿堆场方向沿程递减分布，砂粒在堆场的前250 m沉降完全，粉粒沿堆场水流方向依次沉降，黏粒大部分悬浮在水中，有利于后期实现堆场空间的有效利用和疏浚淤泥的资源化利用。

Based on the load conditions of the sludge particles in water and basic theory of circular pipeline jet, the basic motion equations suitable for the sludge particles were established. Accordingly, the distribution of settling velocity of sludge particles, the velocity distribution of horizontal pipeline jet flow for each section, and the axial velocity distribution of different radial distances were obtained. A layered settlement model was constructed by fitting the motion regularity of the sludge particles along three directions: vertical, axial, and radial, which can simulate the settlement regularity of sludge particles with a grain size between 0.35 μm and 300 μm in the main district of the storage yard during a time period of 17 hours. The particle size was characterized by a fan-shaped distribution which decreased along the length of the storage yard. The sand particles were completely settled in the first 250 m of storage yard, the silty sand particles were settled along the flow direction in the storage yard, and the viscous sand particles mainly suspended in the water, which can be beneficial for the effective use of the storage yard and utilization of dredged sludge.