sediment motion

By the analysis of theory, the research elaborates that the threshold condition for incipient motion of non-uniform sediment with a specific size, is directly related to flow condition, sediment size distribution, location of bed material, and income sediment from upstream.

本项研究从理论上论述了非均匀沙某级粒径的临界可动条件不仅与水流条件有关，也与泥沙级配组成有关，还与床沙位置、上游来沙条件有密切的关系。

The soil in a sediment basin near ground surface is soft. It has a remarkable amplification and filtering effects on earthquake wave and can change the characters of the amplitude and spectrum of ground motion wave significantly.

大型沉积盆地中，近地表土层比较松软，对地震波有明显的放大和滤波的作用，可以显著改变地震动的幅值和频谱特征。

The coarse grain sediment motion initiation and transportation by wave action

波浪作用下粗颗粒泥沙的运动规律

Study on Mechanism of Non-unifom Sediment Motion and Its Computation Method of Transport Rate

非均匀沙的运动机理及输沙率计算方法的研究

On the basis of the stressing features of sediment particles on the river bed surface, the probability distribution of instantaneous initiation moment of sediment particles' motion was deduced to be a normal distribution.

根据位于床面上泥沙颗粒的受力特点，取各力力臂为常量，推导得到泥沙颗粒瞬时起动力矩的概率分布为正态分布。

Numerical model of 2D estuarial suspended sediment motion under the interaction of tidal flow and waves

潮流、波浪综合作用下河口二维悬沙数学模型

Secondly, based on the discussion of condition of sediment incipient motion, the dimensionless unit stream power at sediment incipient motion is put up, so that the theory of sediment incipient motion become more integrated.

二是在对泥沙起动条件讨论的基础上，建立了泥沙起动的无因次临界单位水流功率，进一步完善了泥沙起动的有关理论；

When flow velocity decreases below the corresponding incipient motion condition , no sediment movement occurs.

当水流速度小于相应的起始运动时, 将无泥沙运动.