Simulación hidrodinámica bidimensional del Río Tomebamba en el tramo de la captación PTAP del Cebollar

Abstract

This research analyzes the two-dimensional hydrodynamic modeling of the Tomebamba River at the Cebollar Waste-Water Treatment Plant (WWTP), in the section between the Mazán and Sayausí areas. Hydrodynamic variables were presented using the HEC-RAS and IBER modeling tools over an approximate length of 2.6 km. The input data for these computational tools included a digital elevation model obtained through drone surveying and using a Real-Time Kinematic (RTK) instrument. Hydrographs and a discharge curve corresponding to a 10-year return period were used as boundary conditions for the model. These conditions were obtained from hydrological data provided by readings from hydrological stations near the study area, monitored by the Municipal Communication, Water, and Sewage Company (ETAPA by its Spanish acronym) and National Institute of Meteorology and Hydrology (INAMHI by its Spanish acronym) institutions. To validate the models, a comparison was made with observed water levels for similar events, and the NSE, R², and ECM statistical indices, reflecting good modeling quality. The representations of the flow variables in the intake showed values associated with the characteristics of the hydraulic structure, suggesting an acceptable representation of the flow in this area. Velocities of up to 6.19 m/s were observed, producing shear stresses of up to 177.16 N/m², potentially causing wear on the intake's structural elements and reducing their functionality and lifespan.