Abstract
The objective of this work was to analyze the temporal variability of precipitation in the city of Petrolândia - PE, which is located in the physiographic region Submedium São Francisco. Was used Rainfall Anomaly Index (RAI) to analysis of the variability of precipitation in the region. The highest monthly values of precipitation occurred between the months of December to April, with the highest rainfall in March, while that from August to October was the quarter of less rainfall. From the RAI noted that there was great variability between dry and rainy, with a total of 29 and 34 years, respectively. The RAI presented a amplitude of -4.2 to +6.8, with maxima occurring in, 1974 and 1985, being classified as extremely humid. While the smallest occurred in 1993 and 1998 being classified as very dry. It was found that implementation of the RAI worked as a fundamental tool for the study of seasonal rainfall, yet, through this monitoring and one can generate predictions about the climatological regional variation. For the region dry periods are considered to be more damaging to the economy than the flood periods, despite the damage caused by floods.
Highlights
The climate is one of the elements that characterizes the landscape and higher restlessness, currently promotes his change impacts on health, comfort and daily activities
The observed data are in agreement with study of Silva et al (2011) to physiographic region of the Submedium São Francisco, demonstrating for such a region the same rainy and dry periods, the rainfall season influenced by the meteorological system Intertropical Convergence Zone (ITCZ)
The humid period in the city of PetrolândiaPE includes the months from December to April, being March the month of maximum contribution to the water supply in the basin River São Francisco in the region, the dry semester occurs between August to October, being August the driest month of the period
Summary
The climate is one of the elements that characterizes the landscape and higher restlessness, currently promotes his change impacts on health, comfort and daily activities. In this context, the climatology in the urban space is presented as a research field essential to the management of cities, with a view to improving the quality of life of population, in this case, planning is fundamental, due to the fact that reduces the impacts and maximizes the positive aspects of climate change (Zanella and Moura, 2013). The quantity of water of the watersheds is conditioned the action of various weather systems, it is necessary to implement adequate management, that considers the hydric resources for multiple uses, of which depends on the integrate operation and maintenance of human activities and the preservation of the environment (Santos et al, 2015)
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