Sediment resuspension characteristics under wave distributing of dredging in Taihu Lake

Sediment resuspension characteristics are studied using the laboratory wave flume with different sediment bulk densities(1.34g/cm³,1.47 g/cm³,1.55g/cm³ and 1.59g/cm³)and wave hydrodynamics.Results show that the vertical concentration of suspended sediments is almost uniform without the influence of wave action.Only local sediment resuspension can be observed for small wave amplitudes.The vertical variation in suspended sediment concentrations is insignificant.When the wave height reaches 9cm,the bottom shear stress will be much greater than the critical shear stress.Thus,there will be a sudden increase in suspended sediment concentrations.The concentration will be 10 to 15 times higher than that for small wave amplitudes after 10 minutes.The resuspension quantity can account for about 80% of the gross resuspension within 60 minutes.Large variations are observed in the vertical profile of gross resuspension.The bulb density is highly correlated to the gross resuspension.The larger the bulb density is,the smaller the gross resuspension will be.