Abstract
The goal is to show the variability of meteorological elements in the catchment area of the river Uruçuí Preto - PI (BHRUP), aimed at contributing to sustainable development in the productive areas of agriculture, grain, fruit growing, fishing, laser and hydrology. Weather elements studied are temperature (maximum, minimum and average) air, and their maximum and minimum fluctuations, temperature range, relative humidity, wind (direction and intensity), total insolation, cloud cover, evaporation, evapotranspiration, rainfall. The data discussed are the series of 1960-1990, acquired by the Northeast Development Superintendency and the Company for Technical Assistance and Rural Extension of Piauí State. The maximum annual air temperature is 32.1 °C, annual minimum is 20 °C and the average annual temperature of 26.1 °C. We used climate classification according Köppen systems, which are distinguished two climatic types in the River basin Uruçuí Preto - PI, Aw, tropical hot and humid, with rains in summer and dry in winter; Bsh, hot semi-arid, with summer rains and dry winter. The variation of the temperature range is from 11.9 to 14.9 °C. The average relative humidity of the air is 47-79%, the average annual rainfall is 937.7 mm, it was observed that the annual march of relative humidity accompanies the annual distribution of rainfall because precipitation is the process of supply of natural sources of water vapor and moisture. The total area of Sunstroke BHRUP ranges between 2520 to 2750 hours. The annual evaporation ranges 100-226 mm and the annual evapotranspiration fluctuates between 1160-1600 mm, the intensity of the annual wind with the following highlights in the area of small wind intensity in the far south and in the central and northern part of the southern region found if higher intensities, moderate winds in the northern sector of the central region and in every area of the northern region. The annual cloud cover ranges from 0.4 to 0.6 tenths.
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