Modelación numérica bidimensional del río Garrapata en la provincia de Manabí aplicando el programa Iber

Abstract

This study is to develop the bi-dimensional numeric modeling of Garrapata River for the transit of maximum flows in different return periods, by means of the use of Iber software package. The purpose of this work is the obtaining of results for the develop of thematic maps containing hydraulic variables which allow the identification of flood areas. The numerical modeling in Iber was developed taking into account some aspects, like sensitivity of the mesh size on the results and in the distortion of the terrain. On the other hand, the calibration of the model was done considering the field records and the variation of the roughness coefficient of Manning that was determined by the Cowan equation by an initial estimation. The result of this study is the numerical modeling of flood flows associated with return periods of 5, 10, 25, 50 and 100 years under permanent and non-permanent flow conditions. In addition, it was obtained a comparison between bi-dimensional and one-dimensional results of numerical modeling in a same section. Thematic maps were generated based on the values obtained in each simulation corresponding with maximum values of variables such us: speed, draft and Froude number, which allow the identification of risk areas.