sedimentatevt.沉积sedimentn.沉淀物sediment measuring instruments泥沙测验仪器sediment discharge measurement输沙量测定sediment longitudinal transport沉积物纵向移动sediment erosion and deposition泥沙冲淤sediment colliding shear stress颗粒切应力sediment and scour of reservoir水库泥沙冲淤量sedimentary lead-zinc deposit沉积型铅锌矿sediment intercepting mechanism拦沙机理sediment compressional velocity沉积物声速sedimentation-type centrifuge沉降式离心机