起始运动 meaning in Chinese

first motion

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。
Furtherly , according to their state in suffering force and their modes of initial motion , the casualty loess landfalls on the house side - slope are classified into two types of tension - sliding loess landfall and collapsed earth cave dwelling
根据土体受力状态和起始运动方式，将宅基边坡伤亡性黄土崩塌划分为张裂?滑移式黄土崩塌和坍窑两种类型，总结了其前兆、时空分布特征，着重分析了其形成原因。