Spatial distribution of areas susceptible to sheet erosion in computing environment

Erosion is the main cause of soil and water degradation, which demands investments for the recovery of such natural resources. The purpose of this paper is to quantify and spatialize soil losses in a municipality with large areas of monoculture of sugarcane.

The Universal Soil Loss Equation was applied for the identification of areas susceptible to erosion in the municipality of Jahu, SP, Brazil. Soil maps, statistical census data from Brazilian Institute of Geography and Statistics, radar images from SRTM, rainfall data from Fatec-Jahu hydrometeorological station and digital satellite images from Landsat 5 TM were used for the analyses. Four basic parameters were evaluated: topography of the terrain, rainfall erosivity, soil erodibility, and soil use and management factors. The analyses were conducted in the Geographic Information System (ArcView software).

The results show most of the municipality (91 percent) consists of areas of erosion potential. However, the remaining 9 percent can potentially produce 40 percent of the sediment load, which indicates the need for conservation practices and environmental recovery for a reduction in the erosion process acceleration.

In view of the expansion of sugarcane culture in the cities of São Paulo, the results show the importance of a master plan for new areas of sugarcane planting and the need for restoration of riparian vegetation in the surrounding streams and springs for the reduction of erosion.