It presents the formulation of a one-dimensional numerical model for simulation of flow in the Ucayali river. The model is general and flexible; because it permits to simulate a broad range of flow conditions, such as uniform and non-uniform flow, steady and unsteady. The model does not consider problems of filtration, sediment transport, neither wind. The model is based in the numerical approximation of the governing equations of flow in open channels (Saint Venant’s equations) using the implicit finite difference Preissmann scheme. The dependent variables are the discharge (Q) and the water surface level (Z). The algorithms applied in the segments of the channel plus the boundary conditions compose one system of lineal equations, which is solved using the Double Sweep method. The application is done to a reach of 22 kms of the Ucayali River, near to the Pucallpa city. It presents two...

It presents the formulation of a one-dimensional numerical model for simulation of flow in rivers and channels. The model is general and flexible; because it permits to simulate a broad range of flow conditions, such as uniform and non-uniform flow, steady and unsteady. The model does not consider problems of filtration, sediment transport, rainfall, evaporation, neither wind. The model is based in the numerical approximation of the governing equations of flow in open channels (Saint Venant’s equations) using the implicit finite difference Preissmann scheme. The computation variables are the discharge (Q) and the water surface level (Z). The algorithms applied in the segments of the reach under study plus the boundary conditions compose one system of lineal equations, which is solved using the Double Sweep method. It presents some schematic tests for a prismatic rectangular channel. Th...

The study presents a two dimensional model of dispersion of pollutants built on the basis of a hydrodynamic model developed in a previous work. The coupled model is based on the numerical approach of the two dimensional shallow water flow equations and of the dispersion of substances. Thesc equations are of the continuity of the fluid body, of movement in directions X and Y, and conservation of the concentration of a diluted substance. The dependent variables are the average speeds U and V in directions X and Y respectively, the level of water 1J respect to the mean sea leve!and the concentration C of the diluted substance. The numerical approach is based on the Fischer's explicit finite difference scheme. The model has suitable initial and boundary conditions. The model has been tested under several theoretical experiments, after these tests, it was applied to the Paracas Bay. First, we...