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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Numerical simulation of flow and sediment transport dynamics on the magdalena river section of barra...
Numerical simulation of flow and sediment transport dynamics on the magdalena river section of barrancabermeja-la coquera (colombia).
Author : JOSE OLIVEROS-ACOSTA(1), JORGE ESCOBAR-VARGAS(2), MOHAMED YOSSEF(3),JORGE SANCHEZ(4), CESAR CARDONA(5),
ABSTRACT
Due to the strategic importance of river transportation on the Magdalena River at the current Colombia´s development
plan, Cormagdalena, as managing entity of the Magdalena river basin in Colombia, is building an unsteady numerical
model for the flow and sediment transport dynamics for the Magdalena River (Colombia). This work shows the recent
advances of a case of study on the river section (Barrancabermeja - La Coquera). The numerical platform is the computer
program DELFT 3D which solves the shallow water equations, and the sediment transport equation with a finite difference
approximation in three dimensions XYZ. The model is constrained by four boundary conditions, one at the beginning of the
computational domain, where a flow discharge is imposed, a second one being an outlet condition, where a free surface
elevation is enforced, and two additional flow discharge conditions are imposed, as inlet conditions, to take into account
the Sogamoso River, which acts as a tributary. On each case a hydrograph of ten years was developed based on field
measurements of climatologic stations in Magdalena and Sogamoso Rivers. Two modeling scenarios, for flow and
sediment transport, were established: the first scenario is the modeling of the river natural dynamics, and a second
scenario involves the modeling of groynes for the future maintenance of the waterway. From the hydrodynamic results a
morphological model was developed based on the Engelund & Hansen, and the Meyer-Peter-Müller equations. A grid
independence test was done for each of the simulations, ensuring an optimum distribution of the cells within the
computational domain. Results showed that the numerical model approximates qualitatively the current natural conditions
for three different flow scenarios given by the flow duration curve, and additionally shows the hydrodynamic and
morphological evolution of the river when groynes are present within it. Additional analysis are presented where the
efficiency of the civil works on the river are assessed to ensure the navigability on that section of the Magdalena River.
File Size : 1,965,000 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 19/08/2015
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