Sediment particles is suspended in the sediment-laden flow because of the flow turbulence, and settle down due to gravity action.
挟沙水流中的泥沙颗粒因水流紊动而悬浮，同时受重力作用而下沉。
The atmosphere dispersion theory was used to analyze the influence ol calm wind and gravity action on the diffusion of dust particles .
利用大气扩散理论分析了静风和重力沉降两种作用对尘粒在大气中扩散的影响；
The result demonstrated that the slope is a multistage terrace, if there is no exokinetic force existed, the gravity action of the slope body is insufficient to make the slope sliding.
结果表明斜坡为多级阶地特征，在没有外界动力的作用下，斜坡坡体重力作用不足以使斜坡产生滑动。
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