Análise espacial e temporal das chuvas médias mensais e anuais na bacia hidrográfica do rio Mucuri
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Revista Engenharia na Agricultura
Abstract
O conhecimento da variabilidade espacial e temporal da precipitação é de fundamental importância para o planejamento industrial, econômico e da agricultura, sobretudo para a
caracterização do clima. Neste sentido, objetivou-se, com este trabalho, realizar análise da precipitação média mensal, dos trimestres mais secos e mais chuvosos, e anual para a bacia
hidrográfica do Mucuri. A partir da espacialização dos dados, foi feita uma interpolação pelo método da Krigagem ordinária com semivariograma esférico, com uso do software ArcGis
versão 10.0. Para isso, adotou-se onze estações no sistema online Hidroweb/ANA, as quais dispunham de uma série de dados com no mínimo 30 anos da região do Vale do Mucuri. Foram excluídos da análise os meses com mais de 5% de falha. De acordo com os resultados obtidos, foi possível observar que os meses de novembro, dezembro e janeiro foram os mais chuvosos e que os meses de junho, julho e agosto os mais secos. O trimestre chuvoso correspondeu com cerca de 40 a 55% da precipitação total anual na cabeceira da bacia hidrográfica, enquanto que o trimestre de estiagem registrou cerca 6 a 10% da precipitação total anual.
The knowledge of the spatial and temporal variability of precipitation is fundamental for the industrial, economic, and agricultural planning, mainly for a climate characterization. Then, the aim of this work was to analyze monthly, from the driest and rainiest quarter, and annual rainfall to Mucuri river basin. From the spatialization of the data, it was developed an interpolation by the ordinary Kriging method with spherical semivariogram using the software ArcGis version 10.0. Eleven stations of the Hidroweb/ANA online system were used, which had a series of data with at least 30 years in Mucuri river basin region. The months with more than 5% of failure were excluded from the analysis. According to the results, it was able to observe that November, December, and January months are the rainiest ones, and that June, July and August months are the driest for the basin. The rainy quarter corresponded from 40 to 55% of the total annual precipitation at the head of the river basin, while for the drought quarter only 6 to 10%.
The knowledge of the spatial and temporal variability of precipitation is fundamental for the industrial, economic, and agricultural planning, mainly for a climate characterization. Then, the aim of this work was to analyze monthly, from the driest and rainiest quarter, and annual rainfall to Mucuri river basin. From the spatialization of the data, it was developed an interpolation by the ordinary Kriging method with spherical semivariogram using the software ArcGis version 10.0. Eleven stations of the Hidroweb/ANA online system were used, which had a series of data with at least 30 years in Mucuri river basin region. The months with more than 5% of failure were excluded from the analysis. According to the results, it was able to observe that November, December, and January months are the rainiest ones, and that June, July and August months are the driest for the basin. The rainy quarter corresponded from 40 to 55% of the total annual precipitation at the head of the river basin, while for the drought quarter only 6 to 10%.