A physically-based numerical model is described aiming to represent cross-section evolution and bed-profile modification in a straight channel carrying non-cohesive sediments with any initial channel geometry. The model represents a 1-D gradually varied flow and 2DH vertically integrated sediment transport, taking into account sediment dispersion processes. The cross section evolution is simulated by treating suspended and bed-load transport in a unified sediment mass-balance scheme, including bank stability criteria as boundary condition. Experiments on a straight alluvial channel with sand bed and banks have been carried out in order to investigate cross-section evolution and regime conditions; our experimental results are compared with other results available in literature. The model is checked with experiments performed by ourselves and by other authors. Results are satisfactory in terms of regime values and cross section time evolution.
Alluvial channel cross-section evolution. A physically based numerical model and experiments
LAMBERTI, Alberto;SCHIPPA, Leonardo
1996
Abstract
A physically-based numerical model is described aiming to represent cross-section evolution and bed-profile modification in a straight channel carrying non-cohesive sediments with any initial channel geometry. The model represents a 1-D gradually varied flow and 2DH vertically integrated sediment transport, taking into account sediment dispersion processes. The cross section evolution is simulated by treating suspended and bed-load transport in a unified sediment mass-balance scheme, including bank stability criteria as boundary condition. Experiments on a straight alluvial channel with sand bed and banks have been carried out in order to investigate cross-section evolution and regime conditions; our experimental results are compared with other results available in literature. The model is checked with experiments performed by ourselves and by other authors. Results are satisfactory in terms of regime values and cross section time evolution.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
