ONE-DIMENSIONAL SEDIMENT TRANSPORT MODEL FOR THE TAIACUPEBA RESERVOIR BASIN

Código

PAP032

Autores

SAMUEL BARSANELLI COSTA, PAOLO ALFREDINI, Carlos Lloret Ramos

Tema

PROCESSOS HIDROSSEDIMENTOLÓGICOS E MORFOLÓGICOS: FLUVIAIS, LACUSTRES E COSTEIROS

Resumo

One-dimensional modeling has been successfully adopted since the 1980s in the engineering practice to estimate long-term sediment transport. It is also an important tool for understanding the sediment dynamics in watersheds and for managing sediments in reservoirs. This paper aims to present a one-dimensional HEC-RAS sediment transport modeling for the Taiacupeba reservoir basin, located in Sao Paulo, Brazil, focused to estimate long-term total loads into the reservoir. The results were skewed low because of drought-like conditions, as data collection period overlapped with the 2013-2015 drought in Southeastern Brazil. Such condition contributed to the critical analysis of the results highlighting the use of one-dimensional sediment modeling as an effective tool for validating sediment rating curves. The Laursen-Copeland and Toffaleti transport capacity functions have been shown to be applicable to this river system, as well as the Active Layer and Exner 7 bed sorting and armoring methods from HEC-RAS. Both the sediment rating curves and Manning coefficients were considered preliminary and additional field sampling at higher discharges are encouraged to enhance model accuracy and better estimate loads.