One dimensional simulation of flushing sediment through reservoirs
Subject Areas : Irrigation and Drainage
روزبه
آقامجیدی
1
(گروه سازه‌های آبی، دانشگاه آزاد اسلامی واحد علوم و تحقیقات خوزستان.)
Keywords: Numerical model, مخزن, مدل عددی, سد, Dam, Sediment Flushing, Reservoir and Sediment, آبشویی رسوب, مدل HEC-6,
Abstract :
Control of sedimentation in reservoirs of dams is considered to be one of the most important issues in exploitation of dams and increasing their useful life. Reservoirs act as traps for sediments and prevent transport of sediments to the river. The deposited sediments will decrease the capacity of the reservoirs so that they cannot be in use any more. Various methods are discussed in this study to remove a part of the deposited sediments, but Flushing is the method, which has been used extensively in many projects all over the world due to the fact that the flow energy is utilized and there is no need to employ an external source of energy. In this study a one-dimensional model is developed in which continuity equation of sediment is solved by the finite difference method using the Cranck-Nickolson method. The developed model is capable to compute the variation of the reservoir bed with time. Also , the accumulated flushed sediment volume and reservoir water volume are calculated at different time steps.The Fotran language used for programming of the model was based on the results obtained from physical models employed by several investigators. And comparisonwas done with HEC-6 Model.The verification of the model was done using data from the natural reservoir of Dashidaira dam in Japan. The results were compared with the actual measurements. A good agrement was observed between them but the Hec-6 doesn’t show a good verification.
- جعفری، م .(1380). بررسی آزمایشکاهی وعددی آبشویی رسوبات در مخازن سدها. پایانامه کارشناسی ارشد. دانشکده کشاورزی ، دانشگاه شهیدباهنر کرمان ،146ص.
- زاور، ع. (1381). بررسی ریاضی تخلیه رسوبات از دریچه تحتانی سد پایانامه کارشناسی ارشد. دانشکده مهندسی عمران، دانشگاه شهید چمران اهواز،120ص.
- نقشینه، ا. (1382). بررسی آزمایشگاهی تخلیه رسوبات درمخازن سدها و مقایسه آن با مدل های آزمایشگاهی. پایانامه کارشناسی ارشد. دانشکده مهندسی عمران ، دانشگاه شیراز ،187ص.
-Atkinson, E. (1996). Flushing sediment from Reservoir: REFLUSH User Manual: HR walling ford, UK Report OD ITM 54, March.
-Cheng, X.M. (1992). Reservoir sedimentation in Chinese Hydro scheme:. Int. water Power, &Dam construction, pp. 44-47.
-Fan, J and Jiang Rujin, N. (1980). On methods of desolation of Reservoir. Int Seminar of experts on Reservoir Desalting, Tunis.
-Guan, Y., Rong, F and Wang, H. (1991). A Numerical Model for Sedimentation in Fenhe Reservoir and adjoining Research. International Journal Research IRTECH, Vol.36, No.4, April.
- Hsieh, w and Shen, H. (1999) Flushing Sediment through Reservoirs. ًJournal of Hydraulic Engineering. Vol. 37.
- Ju, J.(1990). Computational methods of Head water erosion and its Application. Journal of sediments Research, Vol.1, pp.33-39.
- Kokobo, T., Ltakura, M and Harada, M. (1997). ً Predicting Methods and Actual Rasults on Flushing of Accumulate Deposits from Dashidaira Reservoirsً, 18th ICOLD, Q75, R, Florence, Conference, San Francisco, California, July26-30.
- Lai, D. and Hseh, W and Shen, H. (1996).ً Flushing Sediment through Reservoirsً. Journal of Hydraulic Research, Vol 34 No. 2, PP. 243-256.
-Lai, J.s. (1994). Hydraulic Flushing for Reservoir Desolation., Dissertation Presented to the University of California at Berkeley, in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy.
-Olsen, n.r. b. (1991). A three dimensional numerical model for simulation of sediment Movement in the water intake. Dr.eng. Degree, The Norwegian Institute of Technology, Division of Hydraulic Engineering, University of Trondheim.
- Olsen, N.B. (1996). Two –Dimensional Numerical Modeling of Flushing. Processes in Water Research., Vol 37 No.1.
- Olsen, N.B. (2003). Three –Dimentional Numerical Modelling of Flushing. Processes in Water Research., Vol 32 No.2.
- Peng, R and Niu, J. (1987). Numerical Model for head ward Erosion on Bed Load ً. Journal of Sediment Research, Vol, 3, Proceeding Conference IAHR, in Grazz, Austria.
- Scherlin, H. (1987). Sediment Sluicing in the Mountain Reservoirs. Proc. IAHR of the Int.Work Shop on Fluvial Hydraulics of Mountain Regions, Trend, Italy, Oct.3-6, pp.B77-B88.
- Stoesser, T. (1999). On the Use of A3D CFD Model to Simulate Reservoir Sedimentation Process. Proceeding Conference, IAHR. 14.
- Tetsuro Tsujimoto, Koichi Fujita. (2008). On Scenario-Driven Research and Development toward the Integrated Management of the River-Basin-Scale Sediment Transport System, Kasen Gijutsu Ronbunshu, Vol.10, June.
- White, W.R and Betts, R. (1984). The feasibility of flushing sediment through Reservoir of the Harare Symposium. Challenges in Africa Hydrology and Water resource: July 1984.IAHR .Pubi.No144.
- Williams, G.P and Wolman, M.G. (2007). Downstream effects of dams on Alluvial Rivers. US Geological Survey Professional Paper 1286.