Erosividade, coeficiente de chuva, padrões e período de retorno das chuvas de Quaraí, RS

摘要: The planning of agricultural and civil engineering activities must be based on knowledge rainfall erosion potential. For Quarai, RS, Brazil, the erosivity its relationship with precipitation coefficient, patterns return period were determined. Daily data from 1966-2003 used. each erosive segments chart same intensity separated recorded in a worksheet. mean estimated, as well monthly annual by EI30 index (International System Units), using software Chuveros. coefficient was calculated. Pearson correlations linear regressions between (Rc) performed. maximum calculated method extreme distribution type I for different durations (1/6, 1/3, 1/2, 1, 2, 4, 8, 12, 24 48 h) periods (2, 5, 10, 20, 50 100 years). Equations adjusted that relate duration to all periods, simple regression, characteristics related graph. values (R factor USLE) determined 9,292 MJ mm ha-1 h -1 year-1. following equations obtained: = -754.37 + 13.50 p (r2 0.85) -47.35 82.72 Rc 0.84). In relation total studied, 44 % number rainfalls 90 volume erosive. Of evaluated, events, 51 had an advanced, 25 intermediate, delayed hydrological pattern. rainfalls, 57 showed advanced pattern, 18