THE ROLE OF RASTER RESOLUTION INTO OVERLAND FLOW AND TOTAL SUSPENDED SOLIDS MODELING IN SMALL URBAN CATCHMENTS

Código

XXIV-SBRH0842

Autores

Marcus Nóbrega Gomes Júnior, Marcio Hofheinz Giacomoni, Eduardo Mário Mendiondo

Tema

SE05.A - Abordagem integrada e inovações para prevenção/mitigação de efeitos da urbanização sobre os recursos hídricos

Resumo

Parallel computing and high-resolution available geographical information data allow the use of complex hydrological models to perform spatial analysis of flow and pollutant spatial distribution. In this paper, we applied a fully distributed model based on the methods of Green-Ampt for infiltration loss, non-linear reservoir for flow routing and build-up and wash-off approach for total suspended solids (TSS) accumulation to investigate the role of raster resolution in water quantity and quality. The model was applied in a parking lot catchment (7.85 ha) at the University of Texas at San Antonio. We compared the results for TSS and overland flow for resolutions of 1-m, 2-m and 5-m. Results indicate that for calibration purposes, a 5-m resolution is suitable to match the observed hydrograph and pollutograph at the outlet, however, might not present accurate spatial distribution of TSS and water surface elevation.