TEMPORAL VARIATION OF SUSPENDED SEDIMENT CONCENTRATION FOR WAVES OVER RIPPLES

作     者：Hyoseob KIM 

作者机构：136-702 861-1 Department of Civil and Environmental Engineering Jeongneung-Dong Kookmin University Korea Seongbook-Goo Seoul 

出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))

年 卷 期：2003年第18卷第3期

页      面：248-265页

学科分类：08[工学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 

基　　金：supported by the KISTEP and EPSRC(LEACOAST) The author is thankful of Mr. Ilsuk Woo's preparation of figures 

主　　题：Sediment concentration Numerical model Ripple Wave 

摘      要：Variations of suspended sediment concentration over ripples in regular waves were described using an existing numerical model system. Nielsen’s (1992) empirical formula for sediment entrainment rate from the bed surface was used with an additional scale factor in the model system. The model system was applied to two typical laboratory experimental conditions selected for description of the variation of suspended sediment concentration. The flow model results are described with regard to wave orbital velocities, vorticity, shear stress, and pressure. The suspended sediment model results show that the suspended sediment concentrations have four or more peak values in a wave period depending on flow and sediment conditions. The model results suggest that the suspended sediment concentrations have four peaks when the ratio of the orbital excursion length amplitude and ripple length is close to 1, and more than four peaks when the ratio of the orbital excursion length amplitude over the ripple length is larg