Author(s): Mohammad Rostami; Sahar Habibi; Seyed Ali Akbar Mosavi
Linked Author(s):
Keywords: River Confluence; Hydro-morpho-sedimentary process; Numerical model; CCHE2D
Abstract: The objective of the present paper is to investigate in detail the changes in the hydro-morpho- sedimentary processes occurring in confluence zone using a numerical model. Therefore, a depth-averaged, two-dimensional, unsteady-flow model, which is named CCHE2D, has been applied for channel confluence and bifurcation applications. In the absence of field data, experimental data for channel confluence collected in the laboratory were used to verify the simulated results. Experiments were performed by Leite Ribeiro et al. (2011) in a confluence flume where the main channel is 8. 5 m long and 0. 50 m wide. A 4. 9 m long and 0. 15 m wide tributary channel is connected at an angle of 90°. Three discharge scenarios were tested. Numerical model was performed as the same geometry, flow and sediment data which used in experimental work. The simulated flow pattern and bed profile change in the confluence zone compared well with the experimental data. The numerical results showed that the maximum height of sedimentation and maximum depth of bed erosion can be predicted with about 7. 3% and 16% error, respectively, by the CCHE2D model.
Year: 2013