Hits:

Indexed by:期刊论文

Date of Publication:2013-04-01

Journal:JOURNAL OF HYDRAULIC ENGINEERING-ASCE

Included Journals:SCIE、Scopus

Volume:139

Issue:4

Page Number:450-455

ISSN No.:0733-9429

Key Words:Three-dimensional models; Sediment transport; Meandering streams; Suspended load; Bed load

Abstract:A three-dimensional (3D) numerical model based on unstructured grids has been used to study flow and bed evolution in a laboratory meandering channel bend. The model employs the Reynolds-averaged Navier-Stokes equations and the low-Reynolds-number k-omega turbulence model for flow simulation. The model incorporates the suspended-load transport module and the bed-load transport module to simulate sediment transport and employs the sediment continuity equation to calculate channel bed evolution. The numerical simulation is performed in a meandering channel with a movable bed, in which the suspended load is comparable to the bed load. The model captures the main features of the bathymetry at equilibrium conditions. The streamwise velocity profiles and the suspended sediment concentration profiles at equilibrium conditions are also predicted by this simulation, and the agreement with the measured data is generally reasonable. The influence of including the suspended load is revealed by the comparison between the results obtained with total-load model and bed-load model in the meandering channel. DOI: 10.1061/(ASCE)HY.1943-7900.0000691. (C) 2013 American Society of Civil Engineers.