HYDROLOGICAL MODELING FOR SIMULATION OF EXTREME FLOW EVENTS IN THE RIVER BASINS OF THE TUBARÃO, SANTA CATARINA (Atena Editora)

Abstract

The simulation of hydrological processes in watersheds has been used as a tool in the management of water resources, due to the possibility of predicting the fluvial regime. This study develops hydrological behavior on a regional scale that integrates rainfall, flow, land type and use, digital terrain model and a model hydrological analysis (HEC-HMS). The study aims to generate project flows to support flood coping procedures and contribute to territorial management. The study area is the basin of Rocinha and Bonito rivers, which form the Tubarão river located in the south of Santa Catarina. This is a region subject to frequent occurrences of floods due to the geomorphology of the basin being embedded in the escarpments of Serra Geral. The HEC-HMS hydrological model was used applying rainfall-runoff that converts excess precipitation into surface runoff, based on the design hydrographs derived from the hydrological model. Using hydrological data, a hydrological model was developed, generating flows for return periods (T2, T10, T25, T50 and T100) of Rocinha and Bonito river basin and the drainage area of ​​the fluviometric station of Orleans Montante. The results achieved point to design flows for the basin of the rivers Rocinha and Bonito from 73 m³/s (T2) to 202.8 m³/s (T100), while for the area of ​​fluviometric station Orleans Amount of 462 m³/s (T2) to 1297.9 m³/s (T100).