Assessment of the performance of numerical modeling in reproducing a replenishment of sediments in a water-worked channel |
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| Institution: | 1. Department of Electrical Engineering, University of Southern California, USA;2. Department of Chemical Engineering and Material Science, University of Southern California, USA;1. Hydrologic Science and Engineering Program, Integrated GroundWater Modeling Center, Department of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401, United States;2. Department of Applied Mathematics and Statistics, Colorado School of Mines, Golden, CO 80401, United States;1. Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, USA;2. Department of Civil and Environmental Engineering, Sejong University, Seoul, Republic of Korea;3. Natural Resources Ecology Laboratory, Colorado State University, Fort Collins, USA;4. Institute of Environmental Engineering, ETH Zurich, Zurich, Switzerland;1. Department of Civil, Mechanics and Environmental Engineering, University of Trento, Trento, Italy;2. School of Geography, Queen Mary University of London, London E1 4NS, UK;3. Faculty of Science and technology, Free University of Bozen, Bozen, Italy;4. Department of Mechanical and Aeronautical Engineering, University “La Sapienza”, Via Eudossiana 18-00184 Roma, Italy;1. Dipartimento di Ingegneria Civile, Chimica, Ambientale e dei Materiali (DICAM), Università di Bologna, Viale Risorgimento, 2, 40136 Bologna, Italy;2. Dipartimento di Ingegneria Civile, Ambiente Territorio e Architettura (DICATeA), Università di Parma, Parco Area delle Scienze, 181/A, 43124 Parma, Italy |
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| Abstract: | The artificial replenishment of sediment is used as a method to re-establish sediment continuity downstream of a dam. However, the impact of this technique on the hydraulics conditions, and resulting bed morphology, is yet to be understood. Several numerical tools have been developed during last years for modeling sediment transport and morphology evolution which can be used for this application. These models range from 1D to 3D approaches: the first being over simplistic for the simulation of such a complex geometry; the latter requires often a prohibitive computational effort. However, 2D models are computationally efficient and in these cases may already provide sufficiently accurate predictions of the morphology evolution caused by the sediment replenishment in a river. Here, the 2D shallow water equations in combination with the Exner equation are solved by means of a weak-coupled strategy. The classical friction approach considered for reproducing the bed channel roughness has been modified to take into account the morphological effect of replenishment which provokes a channel bed fining. Computational outcomes are compared with four sets of experimental data obtained from several replenishment configurations studied in the laboratory. The experiments differ in terms of placement volume and configuration. A set of analysis parameters is proposed for the experimental-numerical comparison, with particular attention to the spreading, covered surface and travel distance of placed replenishment grains. The numerical tool is reliable in reproducing the overall tendency shown by the experimental data. The effect of fining roughness is better reproduced with the approach herein proposed. However, it is also highlighted that the sediment clusters found in the experiment are not well numerically reproduced in the regions of the channel with a limited number of sediment grains. |
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