Characterization of the Pluviometric Regime of the Municipality >/>of Araguaína – TO

Abstract The behavior of rain affects the planning and operation of society’s sectors. One of the ways to know the behavior of the rains of a certain region is through the analysis of the historical series of precipitation. The objective of this work is to analyze and characterize the pluviometric regime of the municipality of Araguaína, based on the historical series of rainfall stations of the National Water Agency. In addition, regional information is presented that can help the management system of the municipality of Araguaína for the sectors that depend on the dynamics of the rainfall in its decisions. Five rain gauges were selected with contributions from direct rain records in the municipality. In general, it was verified that the hydrological year of Araguaína presents well defined seasonality characterized by two periods: the dry period from May to September, and the rainy season from October to April. The average annual precipitation in the entire area of the municipality is 1746.97 mm and, on average, 89% of Araguaína’s total annual rainfall is recorded on the period considered rainy. On the other hand, a little more than 10% of the volume precipitations happens outside the months of October to April.

摘要 降雨特征会影响社会各领域的规划与运行。探究某区域降雨特征的常用方法之一，便是对降水历史序列展开分析。本研究旨在基于国家水务局（National Water Agency）所辖雨量站的降水历史序列，对阿拉瓜伊纳市（Araguaína）的降水情势（pluviometric regime）开展分析与特征刻画。此外，本研究还提供了区域相关数据，可为阿拉瓜伊纳市中依赖降雨动态开展决策的相关领域的管理工作提供支撑。研究选取了5个可提供该市直接降雨观测记录的雨量站。总体而言，研究证实阿拉瓜伊纳市的水文年具有清晰的季节性特征，可划分为两个时段：5月至9月的旱季，以及10月至次年4月的雨季。该市全域年均降水量为1746.97毫米，平均而言，阿拉瓜伊纳市全年总降水量的89%均集中于雨季时段。另一方面，仅有略超10%的降水量出现在10月至次年4月以外的时段。