Effect of sediment disturbance on the phosphorus forms migration under different water temperature

Homogenous turbulence structure near the wall and sediment incipience;

Assuming that the instantaneous bed shear stress is the hydrodynamic mechanism of sediment incipience and transportation,the numerical model of the local scour under the complex flows around the structures is presented.

As one of the most basic problems in the sediment transport theory, the mechanism of the sediment incipience is also needed to be understood for the study of local scouring process.

Experimental study on the sediment incipient motion in circulating flow;

Because the resistance in sediment incipient motion is the sand-grain resistance,it is proposed that computation of the sand-grain resistance is based on resistance of sediment incipient motion.

The motion characteristics of the sand group are researched from the perspective of theory and the dynamic condition for sediment incipient motion is obtained by determining the critical Shearing Stress, which can get rid of the influence of experiential factors and the research of sediment will radically start strict theoretical exploration.

The hydraulic gradients and flow directions were varied in tests to investigate the effects of the seepage on the incipient motion of the sand.

During the fluvial processes of the alternate deposition and erosion, one of the key technologies predicting the bed’s deformation is how the location characteristics of bed material affects incipient motion for non-uniform sediment and transport rate for bed lo.