3D numerical modeling of flow and sediment transport in open channels

Citation
Wm. Wu et al., 3D numerical modeling of flow and sediment transport in open channels, J HYDR ENG, 126(1), 2000, pp. 4-15
Citations number
28
Categorie Soggetti
Civil Engineering
Journal title
JOURNAL OF HYDRAULIC ENGINEERING-ASCE
ISSN journal
07339429 → ACNP
Volume
126
Issue
1
Year of publication
2000
Pages
4 - 15
Database
ISI
SICI code
0733-9429(200001)126:1<4:3NMOFA>2.0.ZU;2-L
Abstract
A 3D numerical model for calculating how and sediment transport in open cha nnels is presented. The flow is calculated by solving the full Reynolds-ave raged Navier-Stokes equations with the k - epsilon turbulence model. Specia l free-surface and roughness treatments are introduced for open-channel flo w; in particular the water level is determined from a 2D Poisson equation d erived from 2D depth-averaged momentum equations. Suspended-load transport is simulated through the general convection-diffusion equation with an empi rical settling-velocity term. This equation and the flow equations are solv ed numerically with a finite-volume method on an adaptive, nonstaggered gri d. Bed-load transport is simulated with a nonequilibrium method and the bed deformation is obtained from an overall mass-balance equation. The suspend ed-load model is tested for channel how situations with net entrainment fro m a loose bed and with net deposition, and the full 3D total-load model is validated by calculating the how and sediment transport in a 180 degrees ch annel bend with movable bed. in all cases, the agreement with measurements is generally good.