River vegetation radically modifies the flow field and turbulence characteristics. To analyze effects on flow, most scientific studies are based laboratory tests or numerical simulations with stems smooth beds. Nevertheless, in this manner, of bed sediments neglected. The aim paper is to experimentally investigate a vegetated channel and, consideration that, comparative experiments velocity mea...

Bed shear stress is an important measure of benthic habitats since it related to many ecological processes. In this study, we focused on the fluctuating characteristics in rough-bed open-channel flows. The roughness element method was adopted mimic natural rough beds and Improved Delayed Detached Eddy Simulation (IDDES) model used obtain comprehensive information about near bed. Three arrangeme...

In nature, environmental and geophysical flows frequently encounter submerged cylindrical bodies on a rough bed. The around the bed are very complicated as flow field in these cases will be function of roughness apart from diameter cylinder velocity. addition, sand-bed has different effects compared to gravel-bed due differences heights. Therefore, main objective this article is compare mean ve...

A physically realistic roughness closure method for the simulation of turbulent open-channel flow over natural beds within the framework of large-eddy simulation LES is proposed. The description of bed roughness in LES is accomplished through a roughness geometry function together with forcing terms in the momentum equations. The major benefit of this method is that the roughness is generated f...