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Numerical simulation of sediment mixture deposition part 1 ... - LTHE

Numerical simulation of sediment mixture deposition part 1 ... - LTHE

ing and exposure effects

ing and exposure effects modify shear stress for coarsest and finest grain sizes. Why a steep front? Initial conditions are very different from the uniform flow conditions corresponding to transport of the upstream input load of sediment. As a consequence, a clear separation will occur between the upstream zone with nearly uniform flow conditions, slowly reaching transport capacity, and the downstream zone with initial flow conditions and poor transport capacity. A massive sediment deposit is the consequence, and the cause, of this clear separation. Bedload transport and suspended load Simulation results would be affected by a different choice for transport formula or by calibration, but general behavior and conclusions concerning the parameters discussed in the present paper would remain the same. A more important question is about the observation made by Seal et al. (1997) that bedload is not the unique transport. Avalanching is observed on the steep front wedge and suspended load is the predominant transport mode downstream of the front. Characterization of transport mode can be done according to Laursen (1958) from comparison of bed shear stress velocity which quantifies turbulence energy and of settling velocity. With flow conditions at the end of the simulation (equilibrium, see Table 2), fine sediment (d

Appendix 1: Characteristics the simulations References 1. BELL, R.G. AND SUTHERLAND, A.J. - 1983 - Non-equilibrium bedload transport by steady flow - J. Hydraulic Engineering, ASCE - 109(3), 351-367 2. BELLEUDY, Ph., HOLLY, F.M. AND EINHELLIG, R. - 1990 - Selected techniques for application of mobile-bed simulation to realistic prototype situations - IIHR report N°176, University of Iowa - 3. BELLEUDY, Ph. - 1992 - Modeling Danube and Isar rivers Morphological evolution. Part II : Comparison of Field Data with Modeling Results - Proc. of the 5th Int. Symp. on River Sedimentation, Karlsruhe, Germany - Vol 3, 1208-1216 4. BELLEUDY, Ph. and SCHÜTTRUMPF, H. - 1994 - Modeling Morphological Impact of a Flood Control Dam - Proc. of the 2nd International Conference on River Flood Hydraulics, York, UK, 22-25 March 1994 - Chapter 11 Morphology, 527-536 5. BELLEUDY, Ph - 1994 - Last 10 years’ LHF experience in developing river sediment simulation software - Proc. of the Int. Symp. East-West, North-South encounter on the state of the art in River Eng. Methods and Design Philosophies., St. Petersburg, Russia - Vol.1, 143-152 6. BELLEUDY, Ph. - 1999 - Numerical simulation of sediment mixture deposition - part 2 : a sensitivity analysis. 7. CUI, Y., PARKER, G. and PAOLA, C. - 1996 - Numerical simulation of aggradation and downstream fining - J. Hydraulic Research, IAHR - 34(2), 185-204 8. DAUBERT, A. and LEBRETON, J.-C. - 1967 - Etude expérimentale et sur modèle mathématique de quelques aspects des processus d’érosion des lits alluvionnaires, en régime permanent et non-permanent - Proc. of XXII congress, IAHR - 9. DI SILVIO, G. - 1991 - Sediment exchange between stream and bottom: a four-layer model - Proc. of the Int. Grain Sorting Seminar. Oct.1991, Ascona-Switzerland. Mitt. der Versuchanstaldt für Wasserbau, Hydrologie und Glaziologie, ETH-Zürich. - Nr.117, 196-191 10. DI SILVIO, G. and MARION, A. - 1997 - Discussion on «Transfer function for the deposition of poorly sorted gravel in response to streambed aggradation » by Toro-Escobar et al. - J. Hydraulic Research, IAHR - 35(4), 563-566 11. ENGELUND, F. and HANSEN, E. - 1967 - A monograph on sediment transport in alluvial streams - Teknisk Forlag, Copenhagen - 12. HOLLY, Jr. F.M. and RAHUEL, J-L. - 1990 - New numerical/physical framework for mobile bed modeling, Part 1: Numerical and physical principles - J. Hydraulic Research, IAHR - 28(4), 401- 416 13. KARIM, M. and KENNEDY, J.F. - 1982 - IALLUVIAL : a computer based flow and sediment routing model for alluvial streams and its application to the Missouri river - IIHR report N°250, University of Iowa - 14. LAURSEN, E.M. - 1958 - The total sediment load of streams - J. of the Hydraulic Division, ASCE - HY 1 15. PARKER, G. - 1991 - Some random notes on grain sorting - Proc. of the Int. Grain Sorting Seminar. Oct.1991, Ascona-Switzerland. Mitt. der Versuchanstaldt für Wasserbau, Hydrologie und Glaziologie, ETH-Zürich. - Nr.117, 19--76 16. PEVIANI, M. - 1992 - Modeling sediment transport in gravel bed rivers: three dimensional effects of sorting - Proc. of the Int. Grain Sorting Seminar. Oct.1991, Ascona-Switzerland. Mitt. der Versuchanstaldt für Wasserbau, Hydrologie und Glaziologie, ETH- Zürich. - Nr.117, 345-358 17. RAHUEL, J.-L. - 1988 - Modélisation de l’évolution du lit des rivières alluvionaires à granulométrie étendue - Thesis, Institut National Polytechnique de Grenoble, France. - 18. RAHUEL, J.-L., HOLLY, F.M., CHOLLET, J.-P., BELLEUDY, Ph. and YANG, G. - 1989 - Bedload and size distribution in paved gravelbed streams - J. Hydraulic Engineering, ASCE - 115(11), 1521- 1542 19. SEAL, R., PAOLA, C, PARKER, G., SOUTHAR, J.B. AND WILCOCK, P.R. - 1997 - Experiments on downstream fining of gravel : 1. Narrow-channel runs - J. Hydraulic Engineering, ASCE - 123(10), 874-884 20. SIEBEN, A. - 1996 - One-dimensional models for mountain-river morphology - Communications on Hydraulic and Geotechnical Engineering - Delft University of Technology, The Netherlands - Report N°.96-2 21. SIEBEN, A. - 1997 - Modeling of hydraulics and morphology in mountain rivers - Thesis, Delft University of Technology, The Netherlands - 22. TORO-ESCOBAR, C.M., PARKER, G. AND PAOLA, C. - 1996 - Transfer function for the deposition of poorly sorted gravel in response to streambed aggradation. - J. Hydraulic Research, IAHR - 34(1), 35-53 JOURNAL OF HYDRAULIC RESEARCH, VOL. 38, 2000, NO. 6 425

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