Erosive rainfall in the Rio do Peixe Valley: Part III - Risk of extreme events

Abstract

Understanding the risks of extreme events related to soil erosion is important for adequate dimensioning of erosion and runoff control structures. The objective of this study was to determine the rainfall erosivity with different return periods for the Valley of the Rio do Peixe in Santa Catarina state, Brazil. Daily pluviographic data series from 1984 to 2014 from the Campos Novos, and Videira meteorological stations and from 1986 to 2014 from the Caçador station were used. The data series of maximum annual rainfall intensity in 30 min, maximum annual erosive rainfall, and total annual erosivity were analyzed for each station. The Gumbel-Chow distributions were adjusted and their adhesions were evaluated by the Kolmogorov-Smirnov test at a significance level of 5%. The Gumbel-Chow distribution was adequate for the estimation of all studied variables. The mean annual erosivity corresponds to the return period of 2.25 years. The data series of the annual maximum individual rainfall erosivity coefficients varied from 47 to 50%.

Produção de água com a aplicação de práticas mecânicas e vegetativas de conservação do solo e água em área de pastagem degradada

“…É importante ressaltar que, via de regra, a região possui períodos de chuva e de estiagem bem definidos, sendo o período chuvoso nos meses de novembro a março e o período de estiagem ocorre nos meses abril a outubro. Estudos de período de retorno e eventos extremos de chuvas são fundamentais para fins de compreensão do comportamento hídrico (Back et al, 2018), ainda mais em áreas sob intervenção de práticas mecânicas.…”