Abstract
ABSTRACT The Climatic Water Balance (CLIMWB) is very used in the climatic characterization and can also offer important contribution in the identification of the water demand for irrigation of a region. For this, reliable precipitation data with good spatial coverage is required. The Tropical Rainfall Measuring Mission satellite -TRMM-3B43-v7 is a partnership between NASA (National Aeronautics and Space Administration) and Japan's Aerospace Exploration Agency (JAXA), which estimates rainfall data for the tropics region. The aim of this study is to evaluate the CLIMWB obtained by the Thornthwaite & Mather method (1955), with estimated rainfall data with the 3B43 product versus those generated with rainfall data and to map pixel-by-pixel water availability with good spatial coverage for the Doce River basin, located in the Atlantic Hydrographic Region, Southeastern Brazil, between the states of Minas Gerais and Espirito Santo. The CLIMWB variables generated with 3B43, together with the precipitation, showed a good correlation with those fed with surface rainfall data. The largest differences between the two datasets were found in some stations in the southeast and northeast of the basin. The CLIMWB variables presented a good correlation, with the best water excess (0.94), followed by water deficit (0.88), water availability (0.84) and real evapotranspiration (0.82). With TRMM - 3B43, we can characterize the CLIMWB in a similar way to that obtained with data observed by the gauges, providing much more extensive coverage. The use of the TRMM - 3B43 precipitation data allows a consistent characterization of the regional water availability, contributing to the agricultural planning and management, mainly to fill the gaps left due to the absence of rain gauges and to possible failures in the rain gauges' data series.
Highlights
The water basin area of the Doce River (WBDR) is of great importance for the agricultural sector covering an area of 86.711 km2 (82% - MG and 18% - ES) and contributes to the generation of expressive borders generated by coffee exports in the states of Minas Gerais and Espírito Santo, and fruit pulp in the state of Espírito Santo, as well as by forestry and livestock
The aim of this study is to compare the climatic water balance obtained by the method of Thornthwaite & Mather (1955), with precipitation data estimated by the 3B43 product versus rainfall data, and to generate the pixel-by-pixel water availability mapping with good spatial coverage for the water basin of the Doce river
The results of the statistical analyzes between the Climatic Water Balance (CLIMWB) and the data estimated by the TRMM satellite product 3B43-v7 versus observed data (OBS) of the rainfall gauges for WBDR are shown in Figure 3 and Table 1, along with the maximum and minimum values of each variable
Summary
The water basin area of the Doce River (WBDR) is of great importance for the agricultural sector covering an area of 86.711 km (82% - MG and 18% - ES) and contributes to the generation of expressive borders generated by coffee exports in the states of Minas Gerais and Espírito Santo, and fruit pulp in the state of Espírito Santo, as well as by forestry and livestock.In the WBDR, especially in the areas of the state of Espírito Santo, there is a great demand for freshwater, and a large number of allocations are registered for the irrigation of monocultures with capture in the Doce river, mainly in the municipalities of Linhares and Colatina (ANA, 2016).The knowledge of rainfall is of great relevance for the management of the water resources of a river basin.The rain gauges are distributed on the terrestrial surface and collect information only for a small area located in its surroundings. The water basin area of the Doce River (WBDR) is of great importance for the agricultural sector covering an area of 86.711 km (82% - MG and 18% - ES) and contributes to the generation of expressive borders generated by coffee exports in the states of Minas Gerais and Espírito Santo, and fruit pulp in the state of Espírito Santo, as well as by forestry and livestock. In the WBDR, especially in the areas of the state of Espírito Santo, there is a great demand for freshwater, and a large number of allocations are registered for the irrigation of monocultures with capture in the Doce river, mainly in the municipalities of Linhares and Colatina (ANA, 2016). This satellite is a partnership between the National Aeronautics and Space Administration (NASA) and the Japan Aerospace Exploration Agency, to monitor and to study the rainfall in the tropics (Kummerow et al, 2000)
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