DANTAS, I. A. M.; http://lattes.cnpq.br/4702438880544717; DANTAS, Iury Araújo Macedo.
Abstract:
The water shortage in the Brazilian semiarid often became a limiting factor for urban,
agricultural and industrial development, directly interfering with life and income of
people. This study aimed to determine the dry recognition index in northeastern
semiarid region, with reference to the daily potential evapotranspiration obtained by
the Penman-Monteith method (FAO) and meteorological data observed in the basin
of Piancó-Piranhas-Açu for a period 23, these data were acquired in the
meteorological station of INMET located in the Irrigated Perimeter of São Gonçalo,
Sousa-PB, with this was compared with the methods of Thornthwaite, Hargreaves
and Blaney-Criddle, for annual, semi-annual, quarterly and monthly periods . Where
its impacts were calculated using statistical methods of Mean Square Error Root and
Bias Error Ages. Where nine of the 23 years were detected with dry, semi-annually
the most severe drought occurred in the second half, being classified as dry extreme
classes, separated by a quarter the last two were more severe droughts, while
monthly its contents are very close in their Most of the results equivalent to more
years of severe drought, starting in May. The Thornthwaite method was the one
closest to the reference method, the most suitable for use in the region, where it is
easy pet needing only meteorological data (temperature).