Relação intensidade-duração-frequência para precipitação extrema em Mossoró - RN

Abstract

Water resources have received special attention, rainfall and river flows are among the main factors that exert different effects in agricultural practice. This study aimed to: adjust the cumulative probability function of the Gumbel data and annual maximum daily precipitation obtain the equation of intensity-duration-frequency, through the breakdown of rain 24h for city Mossoró-RN. Data of maximum annual rainfall from 1970 to 2007, we proceeded to fit the theoretical distribution and were applied, the following compliance tests: Chi-Square, Kolmogov-Smirnov and AndersonDarling, there was also a breakdown of rain a day rains smaller durations, and obtained the equation that represents the relationship intensity-duration-frequency. We observed good fit of the model series, being significant for all tests, the equation generated allowed calculating the maximum intensity of rainfall with different durations and return periods. For example, every ten years (T = 10) the rain is expected maximum 60 minutes (t = 60) is equaled or exceeded by 55.68 mm/h.