EFEITOS DE CENÁRIOS DE USO DA TERRA NA PRODUÇÃO DE SEDIMENTOS NO SEMIÁRIDO DO NORDESTE: O CASO DA BACIA DO RIO DO PEIXE - PB

Código

PAP100

Autores

Jennifer Marinho do Nascimento, Tatiane Gomes Frade, Clara Tavares Gadelha, Richarde Marques da Silva

Tema

MEDIÇÃO, MODELAGEM, TÉCNICAS E TECNOLOGIAS NO CONTEXTO DA HIDROSSEDIMENTOLOGIA

Resumo

The objective of this work was to simulate different scenarios of land use in the Peixe river basin, located in semi-arid of Paraíba State, Brazil, and to analyze the effects of changes in stream flow and sediment yield, making comparisons with the present land use classification. In this study, the SWAT - Soil and Water Assessment Tool was used to perform the hydrological simulation. For this purpose, daily data of temperature, humidity and wind speed of the São Gonçalo meteorological station and precipitation data from 2002?2014 were used. In addition, maps of land use and occupation, soil types and digital elevation model were used. The calibration period was from 2005 to 2007 and the validation period from 2009 to 2014 for Aparecida streamflow gauge. The calibration period was from 2005 to 2008 and the validation period from 2009 to 2013 for Antenor Navarro streamflow gauge. The results showed that the observed and calculated flows were 13.01 m³/s and 2.82 m³/s, respectively. The calibration performance values were considered very good (R² = 0.90 and NS = 0.87), showing a good fit between the observed and estimated data, while for the validation the results of R² and NS were 0.75 and 0.73, respectively. Agriculture produced the highest sediment loads, approximately 3 times larger than the present scenario. It was observed that changes in land use can impact the regime and water availability in the basin.