Abstract
ABSTRACT The Jaguari River Basin forms the main water supply sources for the Sao Paulo Metropolitan Region and other cities in the state. Since the kinetic energy of rainfall is the driving force of water erosion, the main cause of land and water degradation, we tested the hypothesis of correlation between the erosive potential of rainfall (erosivity) and geographical coordinates and altitude for the purpose of predicting the spatial and temporal distribution of the rainfall erosivity index (EI30) in the [...]
Highlights
The Jaguarí River Basin has a drainage area that forms the main sources of water supply for the metropolitan areas of the state of São Paulo, such as the Cantareira System and the Piracicaba River
Since the kinetic energy of rainfall is the driving force of water erosion, the main cause of land and water degradation, we tested the hypothesis of correlation between the erosive potential of rainfall and geographical coordinates and altitude for the purpose of predicting the spatial and temporal distribution of the rainfall erosivity index (EI30) in the basin
This characteristic is common to all the rainfall stations used in this study, which justifies the use of only one equation to estimate the erosivity index (EI30) in accordance with the average monthly rainfall (Michiels et al, 1992)
Summary
The Jaguarí River Basin has a drainage area that forms the main sources of water supply for the metropolitan areas of the state of São Paulo, such as the Cantareira System and the Piracicaba River. The problems of land use and occupation historically and continuously threaten the quality of surface water, the useful life of reservoirs, and the productive capacity of the soil, and the greatest cause of degradation is water erosion (Telles et al, 2011). Effective control of erosive processes in river basins depends on studies of the spatial and temporal behavior of erosive factors, especially rainfall erosivity (Martins et al, 2010; Silva et al, 2010). The kinetic energy of rainfall is the driving force of water erosion, with a direct effect on detachment of soil particles, breaking the aggregates and transporting particles through surface runoff (Wischmeier and Smith, 1978; Panagos et al, 2015). The kinetic energy of rainfall is the driving force of water erosion, with a direct effect on detachment of soil particles, breaking the aggregates and transporting particles through surface runoff (Wischmeier and Smith, 1978; Panagos et al, 2015). Wischmeier (1959) proposed the EI30, which relates the kinetic energy to the maximum intensity in 30 minutes of rain events, to represent the erosivity or erosive potential of the rains
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