Determinación de la mancha de inundación variando el coeficiente de Manning–sector del coliseo Jefferson Pérez Quezada

Abstract

Roughness is a fundamental variable in the analysis of hydraulic behavior in one-dimensional open channel models, as it determines the resistance that water flow experiences when moving over various surfaces. In river modeling, this variable is closely linked to the material properties that make up the riverbed. This study aims to evaluate the impact of Manning's roughness coefficient on the extent of the floodplain of the Tomebamba River, specifically in the area adjacent to the Jefferson Pérez Quezada Coliseum in Cuenca, Ecuador. For this purpose, topographic data were collected using a total station, allowing the generation of a terrain surface with adequate resolution for one-dimensional hydraulic modeling. The analysis was conducted using HEC-RAS software, simulating various combinations of flow rates and roughness coefficients. Three representative flow rates, obtained from a prior flow measurement study in the area of interest, were used, along with a range of roughness values based on specialized technical references. The results revealed a positive correlation between the increase in Manning's coefficient and the expansion of the floodplain. Additionally, significant variability in hydraulic behavior was identified along different sections of the river, attributed to the geometric and topographic characteristics of the channel. This study is crucial for improving the accuracy of flood predictions and strengthening risk management in vulnerable areas.