文章分析了沙粒两种起动的不同性质，首次把流体起动界定为风蚀性起动，把跃移质冲击起动界定为置换性起动。
In this paper, the properties of two starts of sand particles were analyzed, the fluid start was defined as wind erosion start and impact start of saltation as substitution start for the first time.
水流中跃移颗粒的受力分析及其运动机理的研究对于推移质运动理论有着重要的意义。
Forces acting on saltation particles and the mechanism of saltation are very important in bed load research.
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