Effects of sizes and shapes of gravel particles on sediment transports and bed variations in a numerical movable-bed channel |
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| Institution: | 1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China;2. College of Water Resources and Hydropower, Sichuan University, Chengdu, Sichuan 610065, China;3. School of Civil Engineering, University of Leeds, Leeds LS2 9JT, UK;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. 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. Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali (DICAM), Università degli Studi di Palermo, Palermo, Italy;2. Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195, USA;3. Institute of Environmental Engineering - ETH Zurich, Switzerland;4. Department of Civil and Environmental Engineering, Duke University, Durham, NC, USA;1. Water Engineering Department, Shiraz University, Shiraz, Iran;2. School of Comp, Eng. and Math, Centre for Infrastructure Eng., Western Sydney University, Penrith, Australia;1. Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, NY 13699-5705, USA;2. Department of Civil and Environmental Engineering, University of Houston, Houston, TX 77204-4003, USA;3. Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204-4004, USA |
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| Abstract: | The paper presents a numerical movable-bed channel capable of simulating three-dimensional motions of flows and gravel particles in different shapes. At first, the numerical channel was tested against results of fixed-bed channel experiments in which gravel particles were transported. Simulated particle motions were validated in comparison with those in the laboratory experiment. Next, numerical movable-bed experiments with sphere particles and gravel particles were conducted. The results of these experiments clearly elucidated the difference in motion between the large and the small particles, effects of shapes of gravel particles on sediment-transport rates, and hydrodynamic forces and contact forces at incipient motion and at settling. |
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| Keywords: | Numerical movable-bed channel Three-dimensional computation Sediment transport Gravel shape Hydrodynamic force Channel-bed configuration |
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