Variabilidade e regime das chuvas na unidade de planejamento e gerenciamento Ivinhema no período de 1980 a 2010

Abstract

The present study has as a central point and guiding the variability, the rainfall regime and its temporo-spatial spatialization in Ivinhema Planning and Management Unit, over the years classification standard (dry, normal and rainy) and exceptional (very dry and very rainy), present in the time series from 1980 to 2010. The search area is located in the center-south of the State of Mato Grosso do Sul, being an important socioeconomic region and the second largest hydrographic basin, covering an area of 46,085 km², covering 12.5% of the southern territory of Mato Grosso. From a climatic point of view, the search area is influenced by the transition zone where tropical, polar masses and frontal systems act, which determine the pace, the regime, the variability, the amount and characteristics of rainfall that precipitate over the area giving it humid subtropical climate pattern characteristic, with annual rainfall totals between 1,500 and 1,700 mm, and in some years can reach up to 2,000 mm. In order to understand the characteristics and climatic dynamics of the research area it was conducted an initial survey of municipalities with rainfall stations, at UPG-Ivinhema and its surroundings, using the regional weighting method to fill in faults and the Hidro-Plu software.The techniques used to understand the variability and rainfall regime were the construction of histograms and Box Plot graphs, analyzing the rainfall data of each of the sixteen stations within the research area from the Climatic Units determined by Zavattini (2009).The survey revealed that all rainfall stations of UPGIvinhema in 31 years analyzed had predominance of years standard (dry, normal, rainy), with tendency to dry pluviometric regime, leading us to the hypothesis that there may be a new distribution pattern and amount of rainfall, a hypothesis that will require future research.