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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 3: Water and Carbon: Climate Change Impact : 3d numerical modelling of sediment deposition and flushing in the angostura reservoir, costa rica
3d numerical modelling of sediment deposition and flushing in the angostura reservoir, costa rica
Author : S. Haun1, L.E. Hoven2, N.R.B. Olsen1, C.R. Rodríguez Meza3 and L. Lizano3
The current study focuses on computing the sediment deposition and the flushing process in a hydropower reservoir with a three-dimensional numerical model. The applied numerical model (SSIIM 2) solves the Reynolds-averaged Navier-Stokes equations in three dimensions. The turbulence is predicted by the standard k-ε model and the pressure is calculated according to the SIMPLE method. An iterative free water surface algorithm is used which makes it possible to use large time steps. The program uses an adaptive and unstructured grid, which moves with the time-dependent changes in the water and bed levels. The model is tested on the basis of the data from the Angostura reservoir in Costa Rica. Results from the numerical simulation of the deposition and the flushing are presented and compared with bathymetry data of the bed level from the prototype. The computations show that the deposition is easier to model than the flushing. The results for the location of deposition agree better with the measured pattern than the prediction of the erosion of the flushing calculation.
File Size : 1,129,030 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 3: Water and Carbon: Climate Change Impact
Date Published : 01/07/2011
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