Building of a hydrological and hydraulic model (1D/2D) for urban flood analysis in Cucuta, Colombia Construcción de un modelo hidrológico e hidráulico (1D/2D) para el análisis de inundaciones urbanas en Cúcuta, Colombia

Abstract

Understanding the behavior of cities in the face of flood events has become a significant challenge for decision-makers and urban planners worldwide. Nowadays, accurate prediction of surface runoff produced by heavy rainfall allows us to understand the vulnerability of urban environments to future changes in climate and to simulate the effectiveness of different sustainable solutions to reduce urban flood hazards and risk. This research work presents the construction of a hydrological and hydraulic model (1D/2D) for urban flood analysis of a study area in the city of Cucuta, implementing the advanced computational model of rainwater management (PCSWMM) for the dual modeling of the existing urban drainage system. The conceptualization of the model took into account the interaction between the system's collector or channel networks (1D) and the conduction of surface runoff flow (2D), improving the hydraulic representation of flooding. Finally, the proposed model made it possible to know the areas prone to flooding when precipitation occurs, analyzing the velocities and depths of water in the roads for different return periods (10 and 50 years). It also represented the interaction between permeable and impervious areas with the existing urban drainage system to model urban flooding more realistically.