Influencia de la morfología, parámetros hidráulicos e hidrológicos para la determinación de áreas de inundación en la subcuenca del río Tomebamba. Tramo: Calle Los Cedros-Avenida Unidad Nacional

Abstract

The analysis of hydrological and hydraulic parameters of rivers is essential to identify the areas most vulnerable to flooding. The sub-basin of the Tomebamba River, located in the province of Azuay in southern Ecuador, has experienced several floods over time. The floods in the subbasin have caused serious economic losses in the lower part, flooding areas such as Puertas del Sol, Jefferson Perez Coliseum, Vicente Corral Moscoso Hospital, among others. For this reason, it is necessary to analyze the influence of this type of parameters, as well as the influence of the DEM and DTM, in order to identify areas sensitive to flooding in the sub-basin of the Tomebamba River. The area analyzed includes the lower part of the sub-basin (Los Cedros Street to Unidad Nacional Avenue). The methodology focused on hydrological and hydraulic modeling using HECHMS and HEC-RAS software, respectively, for return periods of 5, 10, 25, 50, 75 and 100 years. The hydraulic modeling results showed that Manning's Number is the most influential parameter with a value of 0.035 and significantly affects the channel flow dynamics. In addition, the spatial resolution was found to have a significant influence on the flood stain by overestimating the flood stain in the initial part of the study reach. Finally, it was determined that the Jefferson Perez Coliseum area is the area most prone to flooding, as it overestimates the flood stain in the initial part of the study reach.