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A substantial expansion of sugarcane area in the central region of São Paulo State (Brazil) occurred in last years. The increase of sugarcane cultivation over other forms of land use implies in several changes in the environment mainly related to the geomorphological and hydrological processes in watersheds. Grounded studies on mathematical models, structured in GIS (Geographic Information System) can assist in understanding environmental changes arising the increase of sugarcane cultivation. This data can assist public and private institutions responsible for management and maintenance agricultural activities in this region. Therefore, this study aimed at evaluating the effects of changes in land use about hydrological and geomorphological processes in Jacaré Guaçú stream basin (São Paulo State Brazil). More precisely, were analyzed the effects of changes in land use between 1987, 2004 and 2013 about laminar erosion process and Jacaré Guaçú river flow. Soil, rainfall and Remote Sensing data were used to structure the mathematical model USLE (Soil Loss Equation Universal) in the GIS (Geographic Information System) and to estimate soil loss by laminar erosion. Statistical techniques were used to evaluate changes in trends from historical data of Jacaré Guaçú river flow. The results confirmed an increase of soil loss by laminar erosion bigger then 15 t. ha year -1 between 1987, 2004 and 2013 within the study area. The increase in local places with temporary culture and exposed soil, both linked to the expansion of sugarcane areas, contributed to these results. Between the same period (1987, 2004 and 2013) there was a decrease in classified locations with soil loss between 0 3 t. ha year -1 because of area reduction with pastures and tree vegetation in hidrographic basin. Soil losses classified between 3-5, 5-10 and 10-15 t. ha year -1 increased between 1987 and 2004 and decreased between 2004 and 2013. Statistical analysis showed no significant variation average, maximum and minimum of Jacaré Guaçú river flow between 1987, 2004 and 2013.

Análise multitemporal das perdas de solo por erosão laminar e do regime de vazão fluvial na bacia do rio Jacaré-Guaçú (SP)