Montagem de pluviômetros vetoriais de PVC e um ensaio da direção da chuva em Barra do Garças - MT

Abstract

The seasonal variability of precipitation in the Central-West Region is mainly influenced by variations in wind direction and atmospheric circulation associated with the conditions of the Atlantic Ocean. This work had as main objective to demonstrate the assembly of PVC vector rain gauges and to carry out a rain direction test in Barra do Garças-MT. After assembling the battery of PVC vector rain gauges, they were installed in the ground at 1.50 cm and oriented in the North, South, East, West and horizontal directions, with collecting areas inclined at 45°. The research in the study area began on 03/01/2023 and ended on 04/30/2024, thus the monthly rainfall accumulation for the referred year of 2023 was 1,731.8 mm. Subsequently, for the year 2024, from January to March, the rainfall accumulation was 2,179.2 mm. Therefore, the rainfall amounts recorded behaved irregularly during the months analyzed, with the months of March, January and February standing out with the highest rainfall volumes, and for the other months the values decreased significantly. Preferably, rainfall occurred from the S-South; E-East; W West; N-North portion in the year 2024, being predominant in the month of March. In the year 2023, it followed the sequence of E-East; S-South; W-West; N-North, also in the month of March. A striking characteristic of the Central-West Region is the spatial distribution of precipitation, which always behaved irregularly with several oscillations in the monthly amounts.