Author(s): M. Shourian; S. Ali A. Salehi Neishabouri
Linked Author(s):
Keywords: Simulation; Pit Migration; Sand and Gravel; River
Abstract: Sand and gravel mining from riverbeds is a major supply of construction materials. A mining pit in a riverbed is very unstable and subject to scouring and deposition which results in migration of the pit. In this paper, migration of a rectangular pit in a straight channel bed composed of uniform sediments is simulated with SSIIM model. The numerical model solves the transient Navier-Stokes equations with theκ-εturbulence model. The sediment flow is calculated by solving the transient convection-diffusion equation for sediment concentration. Van Rijn' s formula for sediment concentration is used as boundary condition for the bed. Sediment continuity for the cells close to the bed gives the bed changes with time. The effect of the initial depth of the pit on the process of the migration is surveyed. Regression equations for the maximum scour depth, shape and speed of the migration of the pits are obtained.
Year: 2004