Impacto de sistemas meteorológicos no regime hídrico em cidades do semiárido.

Abstract

The period from 2012 to 2016 was a period of below-average rainfall in the semiarid region, droughts cause water deficiency and risks to food, energy and water security in the regions. This study analyzed the meteorological systems that contributed most to the rainy season from the years 2012 to 2016, and among these phenomena that caused the greatest accumulation of precipitation and were fundamental for the basins of the States of Paraíba and Ceará. Precipitation data were analyzed from 170 stations in Paraíba and 150 from Ceará, choosing ten municipalities in which the highest rainfall observed during the study period occurred and NDVI was investigated the vegetation of these municipalities and the level of the reservoirs. The identification of which meteorological systems contributed the most to these accumulations of precipitation was carried out through the analysis of the climatological bulletins of the rainy months. It was noticed that even the ITCZ being out of its normal position was one of the phenomena that contributed the most to the occurrence of these precipitations, besides the fundamental performance of the VCANs, especially in 2014 with the highest accumulated ones, and in Ceará it was highlighted also LI. While the year 2016 was the year that obtained the least rainfall, due to the performance of the phenomenon of El Niño, the strongest in recent years. This impacted the vegetation and the NDVI analysis. It was possible to notice that 2013 presented larger areas of vegetation when compared to the year 2016.