Determinação do índice de disponibilidade de umidade para a região oeste do Paraná.

Abstract

This current study aims at determining the humidity availability index (Índice de Disponibilidade de Umidade – IDU) for the western region of the State of Paraná. Monthly temperature average data in ºC from 12 regional stations, gotten from IAPAR (Instituto Agronômico do Paraná) and from SIMEPAR (Sistema Meteorológico do Paraná) were used. Besides this data, monthly precipitation data in mm were also utilized. Through temperature registers, referential evapotranspiration (Eto) values were worked out through the Camargo method. The estimated Eto values with a 75% occurrence level and the adjustments in the Gama and Lognormal probability models were made with the help of the 6.0 version of the MATLAB R12 software. Kolmogorov- Smirnov adherence tests were used to validate these adjustments, with a 5% probability. After all probability model adjustments, the IDU was worked out. The monthly Eto series from the western region of Parána were well represented by the Gama and Lognormal distributions. In relation to the IDU, none of the assessed stations presented hydric deficit and 10 out of 12 stations presented hydric excess in a certain month of the year.