Numerical simulation for predicting concentration profiles of cohesive sediments in surf zone

A hybrid numerical model is introduced for simulation of cohesive sediments concentrationprofiles in a surf zone. for this purpose, wave height reduction must be considered, due to muddy bedsand wave breaking. models, such as sanford and maa's erosion model, krone's sedimentation model,tajima's wave breaking model and the visco-elasticplastic rheological model, are used to investigate theinteraction of wave and bed and to predict the concentration profile. a splitting algorithm has been usedto split the three-dimensional advectiondiffusion equation into a horizontal, two-dimensional equation,and a vertical, one-dimensional equation, due to different length scales. the one-dimensional equation isdiscretized over a non uniform grid, and, then solved implicitly using the quickest scheme (third orderin time and space). the two-dimensional equation is divided into two parts (advection and diffusion) andeach part is separately solved at different time steps. a suitable mesh, regarding space and time intervals,is chosen for considering the stability of the present model. the computational domain extends from theshoreline to the deepwater zone. finally, the results are analyzed and compared with experimental andfield data and other models. good agreement has been obtained with the data and other numerical models.