Predictive Model for Resuspension and Deposition of Bottom Sediment in a Lake
1988 Volume 49 Issue 3 Pages 185-200
Details
1988 Volume 49 Issue 3 Pages 185-200
To estimate the time change of resuspended sediment concentration in a lake, a field observation was carried out at the platform in the Northern Basin of Lake Biwa, and a predictive model, containing effects of both wind waves and currents induced by wind, was constructed. In this model, two layers were considered : one, the lower layer, referred to the bottom turbid layer, and the other, the upper layer, above the lower layer. The bottom turbid layer was defined as the region where an acceleration term is balanced with a stress term.
The prediction was applied to the field data, and the predicted values were compared with the observed ones. It was found that the unsteady solution yields better agreement with the field data than the steady solution. The depth of erosion was also estimated to be less than 0.2 cm. With the optimization method, the drag coefficient (Cd) and the parameter (γ) concerned with suspended sediment concentration in the bottom turbid layer were estimated, and the values of 0.71.2×10-3 for Cd and 0.33.9×10-3 for γ were obtained. The correlation coefficient between the predicted values and the observed values was 0.83.
