Non-Cohesive Sediment Transport Capacity in Detention Rockfill Using a Combined 1D Model and Dimensional Analysis | ||
| تحقیقات مهندسی صنایع غذایی | ||
| Article 7, Volume 5, Issue 4, January 0, Pages 77-88 PDF (442.24 K) | ||
| Document Type: Research Paper | ||
| Abstract | ||
| Pure rockfill dams have been found specific attention in watershed management and flood control, recently. In addition to hydraulic specific features, one of the important advantages of these structures is their consistency with nature and environment. Normally, floods are accompanied with high sediment loads which may enter the body of dam. When flow through dam body governed by hydraulic gradient higher than the critical one, sediment will pass through and be transported downstream the dam. If sediment load transported through rockfill dam is more than sediment transport capacity of downstream channel, then erosion may occur downstream and if less, excess sediment load will be settled down. Therefore, it is important to determine sediment transport capacity of flow through rockfill dams before building them. For this purpose a 1-D model for flow through rockfill dam accompanied with sediment transport relationship in coarse porous media (rockfill) has been developed. The rockfill dam used in the experiments was consisted of a rectangular block of 600 mm long, 300 mm wide and 300 mm high. The experiments were conducted for two rockfill (14.5 and 21mm) three sediment sizes (0.256, 0.362 and 0.512 mm) , and five flow rates (5 to 13 l/sec). The refered relationship includes some coefficients related to the rockfill media and its flow turbulence which need to be identified. In this regard, experiments have been conducted. The results of the model compared to the observed experimental data have been shown to be reliable. | ||
| Keywords | ||
| Hydraulic; Non-Cohesive; Rockfill Dams; Sediment transport | ||
| References | ||
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1- Eurgun, S. 1952. Fluid flow through packed columns. Chem. Eng. Progress. 48 (2), 90-98. 2- Joy, D. M., Lennox, W. C. and Kouwen, N. 1991. Particulate transport in porous media under non-linear flow condition. J. of Hydraulic Res. 29 (3), 373-385.
3- Li, B., Garga, V. K. and Davis, M. H. 1998. Relationship for non-darcy flow in rockfill. J. of Hydraulic Eng. 124 (2), 206-212.
4- Maeno, S., Michioku, K., Morinaga, S. and Ohnishi, T. 2003. Hydraulic characteristics of a rubble mound weir and its failure process. Annual J. of Hydraulic Eng. JSCE. 57, 302-308.
5- McCorquodal, J. A., Hannoura, A. A. and Nasser, M. S. 1978. Hydraulic conductivity of rockfill. J. of Hydraulic Res. 16 (2), 123-137.
6- Meyer, L. D., Foster, G. R. and Nikolov, S. 1975. Effect of flow and canopy on rill erosion. Trans. of the ASCE. 18(5), 905-911.
7- Michioku, K., Maeno, S., Furusawa, T. and Haneda, M. 2003. Discharge through a permeable rubble mound weir. Annual J. of Hydraulic Eng. JSCE. 55, 391-396.
8- Sakthivadivel, R. 1972. Sediment transport through a porous column, In: Shen, H. W., (Ed.) Sedimentation.
9- Samani, H. M. V., Samani, J. M. V. and Shaiannejad, M. 2003. Reservoir routing using steady and unsteady flow through rockfill dams. J. of Hydraulic Eng. 129 (6), 448-454.
10- Schachli, U. 1995. Basic equation for siltation of riverbed. J. ofHydraulic Eng. 121 (3), 274-287.
11- Stephansen, D. 1976. Rockfill in hydraulic engineering. Elsevier Science Publisher, New York, USA.
12- Ward, J. C. 1964. Turbulent flow in porous media. J. of Hydraulic Eng. 92 (4), 1-12.
13- Wu, F. C. 1993. Stochastic modeling of sediment intrusion into gravel bed. PhD thesis, University of California. Berkeley. California.
14- Wu, F. C. and Huang, H. T. 2000. Hydraulic resistance induced by deposition of sedimentation in porous medium. J. of Hydraulic Eng. 126 (7), 547-551. | ||
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