Water balance of the upper Paraguay basin and its relationship with hydroclimatological dynamics of the Pantanal wetland .
Water balance of the upper Paraguay basin and its relationship with hydroclimatological dynamics of the Pantanal wetland .
Author(s): MACEDO, H. de A.; STEVAUX, J. C.; SILVA, A.; BERGIER, I.
Summary: ABSTRACT: Water storage in a drainage basin determines its water security. The quantity of water retained in the watershed can be measured by means of the water balance calculation. This balance can be defined by the input of water subtracted from the outputs. Howev er, for the Pantanal, the measurements of water inlet and outlet are expensive, which makes the use of remote sensing data a high impact tool with clear socioeconomic advantages. Studies of water availability with orbital sensors are relatively scarce in the Upper Paraguay Basin (BAP). This work is an attempt to estimate the BAP water balance using rainfall and evapotranspiration remote sensing data from the Tropical Rainfall Measuring Mission (TRMM) and the MODIS Global Evapotranspiration Project (MOD16), respectively. The results indicate that BAP had an annual surplus of water between 2000 and 2014, though water parameters seem weakly correlated at annual basis. However, there may be atmospheric-climatic phenomena that maximize the correlation between the hydrological parameters and the temperature anomaly with delays of 2 to 5 years, suggesting lagged teleconnections with QBO and ENSO. RESUMO: O armazenamento de água de uma bacia de drenagem determina a sua segurança hídrica. A quantidade de água retida na bacia pode ser medida por meio do cálculo do balanço hídrico, definido pelas entradas de água subtraída das saídas. As medidas hídricas de entrada e saída em uma bacia de drenagem são onerosas, o que torna o uso de dados de sensoriamento remoto uma ferramenta de grande impacto socioeconômico para fins de gestão. Somado a isto, tem-se que estudos de disponibilidade hídrica com sensores orbitais são relativamente escassos para a Bacia do Alto Paraguai (BAP). Dessa forma, a partir do processamento de dados de precipitação do Tropical Rainfall Measuring Mission (TRMM) e de evapotranspiração do MODIS Global Evapotranspiration Project (MOD16), o presente trabalho traz uma estimativa do balanço hídrico da BAP com sensores orbitais. Os resultados indicam que a BAP apresentou um superávit hídrico anual entre 2000 e 2014, muito embora os parâmetros hídricos anuais sejam pouco correlacionados. No entanto, parece haver fenômenos atmosféricos-climáticos que maximizam a correlação entre os parâmetros hidrológicos e a anomalia de temperatura com atrasos de 2 a 5 anos, presumivelmente via teleconexões climáticas defasadas com QBO e ENSO.
Publication year: 2019
Types of publication: Journal article
Unit: Embrapa Pantanal
Keywords: Bacia Hidrográfica, Balanço Hídrico, Hydrologic factors, Water balance
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