Numerical calculation for bed variation in compound-meandering channel using depth integrated model without assumption of shallow water flow |
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| Institution: | 1. Hydraulics and Environment Department, National Laboratory of Civil Engineering, Portugal;2. Faculty of Engineering and Science, Universitetet i Agder, Norway and UNIDEMI and Department of Civil Engineering, FCT, Universidade Nova de Lisboa, Portugal;3. CEHIDRO and DECivil, Instituto Superior Técnico, Universidade Técnica de Lisboa, Portugal;1. International Research Institute of Stavanger, P.O. Box 8046, N-4068 Stavanger, Norway;2. University of Stavanger, Department of Petroleum Engineering, N-4036 Stavanger, Norway;1. LUSAC (EA 4253), Université de Caen Basse-Normandie, Site Universitaire, BP 78, 50130 Cherbourg-Octeville, France;2. Hydraulics Laboratory, Department of Civil Engineering, KU Leuven, Kasteelpark Arenberg 40, box 2448, B-3001 Leuven, Belgium;1. Department of Civil and Environmental Engineering, University of Western Ontario, London, Ontario, Canada;2. Department of Civil Engineering, Queen’s University, Kingston, Ontario, Canada;1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, 34 Hujuguan Road, Nanjing, 210024, China;2. IHE Delft Institute for Water Education, PO Box 3015, 2601, DA, Delft, the Netherlands;3. Deltares, PO Box 177, 2600, MH, Delft, the Netherlands;4. Civil Engineering and Geosciences Faculty, Delft University of Technology, PO Box 5048, 2600, GA, Delft, the Netherlands |
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| Abstract: | In a compound meandering channel, patterns of flow structures and bed variations change with increasing water depth owing to complex momentum exchange between high-velocity flow in a main channel and low-velocity flows in flood plains. We have developed a new quasi-three-dimensional model without the shallow water assumption, i.e., hydrostatic pressure distribution; our method is known as the general bottom velocity computation (BVC) method. In this method, a set of depth-integrated equations, including depth-integrated momentum and vorticity equations, are prepared for evaluating bottom velocity and vertical velocity distributions. The objective of this study is to develop a bed variation calculation method for both single and compound meandering channels by using the BVC method coupled with a sediment transport model. This paper shows that the BVC method can reproduce the pattern change of bed variation in a compound meandering channel flow with increasing relative depth. The variation in sediment transport rate due to overbank flow is explained by experimental and computational results. |
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| Keywords: | Compound meandering channel Bed variation Secondary flow Depth-integrated model Shallow water assumption General bottom velocity computation method |
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