Caracterização pluviométrica do Quadrilátero Ferrífero na região do Sinclinal Moeda – Minas Gerais

Abstract

Located in the east portion of the Quadrilátero Ferrífero and south of the metropolitan region of Belo Horizonte, Moeda syncline has water relevance for the region and comprises 9 municipalities. The area rainfall study is necessary to understand its water dynamics, in addition to being an indicator of climate trends and possible anomalies. The data from a historical series of rainfall stations in the hydrological period from 1984/85 to 2018/19 was used. The Double Mass and Multiple Linear Regression methods were used to verify the data homogeneity and complete the missing annual data through the R². The calculation of rainfall averages per season was executed using the arithmetic average method. Then, Thiessen Polygon method enabled the calculation of the areas of influence, the average precipitation of the region, in addition to the most representative station. The centenary rainfall behavior was sketched from the data analysis of the Mineração Morro Velho station, which has more than 130 years of registers, observing 9-year cycles, in addition to a reduction from 2013/14. The rainfall analysis concerning the cycles rainy days indicated a decrease in total rainfall, as it reveals the decay of rainy days.