Hydrological Response to Drought Occurrences in a Brazilian Savanna Basin

Junqueira, Rubens; Viola, Marcelo Ribeiro; Amorim, Jhones da Silva; Mello, Carlos Rogério de

doi:10.3390/resources9100123

Cited by 13 publications

(9 citation statements)

References 36 publications

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“…It can be observed that the environmental protection areas are greater water producers than the other parts of basin, they represent 55% of the total area of the basin and have an average of REmlt of 17 L s -1 km -2 . SRB headwater REmlt is high when compared to others obtained for Cerrado biome basins such as by Rodrigues et al (2016) in the Manuel Alves da Natividade river basin, neighboring to the SRB, which obtained an average REmlt equal to 13.8 L s -1 km -2 , and by Junqueira et al (2020) in the Pandeiros river basin, located in the Minas Gerais State, which obtained an average REmlt equal to 6.46 L s -1 km -2 . Although they are in the same biome, the higher REmlt values obtained in SRB headwater are associated with greater environmental protection in this basin.…”

Section: Swat Calibration and Validationmentioning

confidence: 45%

“…It can be observed that the environmental protection areas have a high minimum water production, showed an average of REmin of 4.95 L s -1 km -2 while the other parts of basin showed an average of REmin of 3.85 L s -1 km -2 . Junqueira et al (2020) found an average of REmin equal to 3.6 L s -1 km-2 for the Pandeiros river basin, also located in the Cerrado biome, which highlight the importance of environmental protection areas in maintaining the higher REmin value obtained in SRB headwater.…”

Section: Swat Calibration and Validationmentioning

confidence: 70%

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Hydrological modeling in the Sono river basin, environmental protection region of the Jalapão, Brazilian savanna

Rodrigues

Junqueira

Amorim

et al. 2021

Rev. Bras. Geog. Fis.

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The Sono river basin (SRB) is an important ecological area located at the Cerrado biome, which encompasses several environmental protection units, highlighting the Jalapão State Parque. In order to assist the water resource management, this paper developed a hydrological simulation of the SRB, delineated at the Jatobá station (drainage area of 16,862 km²), using the SWAT model, and determined the spatial distribution of the mean, maximum, and minimum specific yields (REmlt, REmin, and REmax) in the basin. The performance of the model was evaluated using Nash-Sutcliffe efficiency (NSE) and percentage bias (PBIAS). For the monthly calibration and validation periods, respectively, NSE values of 0.55 and 0.56 and PBIAS values of 8.2% and -10.2% were obtained. For daily calibration and validation periods, respectively, NSE values of 0.40 and 0.41 and PBIAS values of 8.2% and -11.2% were obtained. These results indicate that the SWAT was able to model the monthly and daily streamflows of the SRB. In addition, the REmlt, REmin and REmax maps showed that the environmental protection areas are the biggest water producers compared with the other parts of the basin. Therefore, the results achieved in this study are fundamental tools for the water resources management at this important ecological region. Keywords: soil and water assessment tool; Cerrado biome; Tocantins-Araguaia river basin. Modelagem hidrológica na bacia do rio Sono, região de proteção ambiental do Jalapão, savana brasileira R E S U M OA bacia do rio Sono (SRB) é uma importante área ecológica localizada no Cerrado, a qual engloba diversas unidades de proteção ambiental, com destaque para o Parque Estadual do Jalapão. Visando auxiliar a gestão dos recursos hídricos, este trabalho desenvolveu uma simulação hidrológica da SRB, delineada na estação Jatobá (área de drenagem de 16.862 km²), utilizando o modelo SWAT, e determinou a distribuição espacial dos rendimentos específicos médio, máximo e mínimo (REmlt, REmin e REmax) na bacia. O desempenho do modelo foi avaliado por meio do coeficiente de Nash-Sutcliffe (NSE) e do percentual de viés (PBIAS). Para os períodos mensais de calibração e validação, respectivamente, foram obtidos valores de NSE de 0,55 e 0,56 e valores de PBIAS de 8,2% e -10,2%. Para os períodos diários de calibração e validação, respectivamente, foram obtidos valores de NSE de 0,40 e 0,41 e valores de PBIAS de 8,2% e -11,2%. Esses resultados indicam que o SWAT foi capaz de modelar as vazões mensais e diárias da SRB. Além disso, os mapas REmlt, REmin e REmax mostraram que as áreas de proteção ambiental são as maiores produtoras de água em comparação com as demais partes da bacia. Portanto, os resultados alcançados neste estudo são ferramentas fundamentais para a gestão dos recursos hídricos nesta importante região ecológica. Palavras-chave: soil and water assessment tool; bioma Cerrado; bacia hidrográfica dos rios Tocantins-Araguaia.

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Section: Swat Calibration and Validationmentioning

confidence: 45%

Section: Swat Calibration and Validationmentioning

confidence: 70%

Hydrological modeling in the Sono river basin, environmental protection region of the Jalapão, Brazilian savanna

Rodrigues

Junqueira

Amorim

et al. 2021

Rev. Bras. Geog. Fis.

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“…For this study, seven meteorological drought categories were considered according to the criteria proposed by McKee et al [82], as shown in Table 2. 1 The cumulative probability of non-exceedance for each SPEI/SSI drought category according to Junqueira et al [83].…”

Section: Methodsmentioning

confidence: 99%

Drought Assessment in the São Francisco River Basin Using Satellite-Based and Ground-Based Indices

Paredes‐Trejo¹,

Barbosa²,

Giovannettone³

et al. 2021

Remote Sensing

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The São Francisco River Basin (SFRB) plays a key role for the agricultural and hydropower sectors in Northeast Brazil (NEB). Historically, in the low part of the SFRB, people have to cope with strong periods of drought. However, there are incipient signs of increasing drought conditions in the upper and middle parts of the SFRB, where its main reservoirs (i.e., Três Marias, Sobradinho, and Luiz Gonzaga) and croplands are located. Therefore, the assessment of the impacts of extreme drought events in the SFRB is of vital importance to develop appropriate drought mitigation strategies. These events are characterized by widespread and persistent dry conditions with long-term impacts on water resources and rain-fed agriculture. The purpose of this study is to provide a comprehensive evaluation of extreme drought events in terms of occurrence, persistence, spatial extent, severity, and impacts on streamflow and soil moisture over different time windows between 1980 and 2020. The Standardized Precipitation-Evapotranspiration Index (SPEI) and Standardized Streamflow Index (SSI) at 3- and 12-month time scales derived from ground data were used as benchmark drought indices. The self-calibrating Palmer Drought Severity Index (scPDSI) and the Soil Moisture and Ocean Salinity-based Soil Water Deficit Index (SWDIS) were used to assess the agricultural drought. The Water Storage Deficit Index (WSDI) and the Groundwater Drought Index (GGDI) both derived from the Gravity Recovery and Climate Experiment (GRACE) were used to assess the hydrological drought. The SWDISa and WSDI showed the best performance in assessing agricultural and hydrological droughts across the whole SFRB. A drying trend at an annual time scale in the middle and south regions of the SFRB was evidenced. An expansion of the area under drought conditions was observed only during the southern hemisphere winter months (i.e., JJA). A marked depletion of groundwater levels concurrent with an increase in soil moisture content was observed during the most severe drought conditions, indicating an intensification of groundwater abstraction for irrigation. These results could be useful to guide social, economic, and water resource policy decision-making processes.

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“…The precipitation in the Brazilian savanna is significantly influenced by the South Atlantic Convergence Zone (SACZ), which is characterized by the coupling of the convergent winds and moisture to transient vortices from higher latitudes and remains quasi-stationary for several days, mainly in the austral summer (December to February) [34,35]. In addition, other climatic phenomena, such as the El Niño-Southern Oscillation (ENSO), can influence precipitation in the basin [33].…”

Section: Study Areamentioning

confidence: 99%

“…SWAT is based on the water balance in each of the HRUs, according to Equation (1) [39]. The average annual precipitation in the PRB is 1085 mm, of which 92% occurs during the rainy period (October to March), and evapotranspiration corresponds to 81.4% of rainfall [33]. The precipitation in the Brazilian savanna is significantly influenced by the South Atlantic Convergence Zone (SACZ), which is characterized by the coupling of the convergent winds and moisture to transient vortices from higher latitudes and remains quasi-stationary for several days, mainly in the austral summer (December to February) [34,35].…”

Section: Swat Modelmentioning

confidence: 99%

Hydrological Retrospective and Historical Drought Analysis in a Brazilian Savanna Basin

Junqueira

Viola

Amorim

et al. 2022

Water

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Analyzing historical droughts is essential to improve the assessment of future hydrological risks and to understand the effects of climate variability on streamflow. However, prolonged and consistent hydrological time series are scarce in the Brazilian savanna region. This study aimed to analyze the performance of climate reanalysis products in precipitation estimation, hydrological modeling, and historical drought analysis in a Brazilian savanna basin. For this purpose, precipitation data from the twentieth-century atmospheric model ensemble (ERA-20CM) and the land component of the fifth generation of European ReAnalysis (ERA5-Land) with bias correction were used. The weather variables were obtained from the Climatic Research Unit (CRU) and the hydrological modeling was performed using the Soil and Water Assessment Tool (SWAT). The Standardized Streamflow Index (SSI) was used to calculate hydrological drought in the basin. Overall, ERA5-Land performed satisfactorily in precipitation estimation, mainly on the monthly time scale, hydrological modeling, and drought prediction. Since ERA-20CM showed unsatisfactory values for the performance statistics in all analyses, the hydrologic drought (1950 to 2018) was performed with ERA5-Land. The results showed both an increase in the number of dry months and a decrease in wet months in recent decades.

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Hydrological Response to Drought Occurrences in a Brazilian Savanna Basin

Cited by 13 publications

References 36 publications

Hydrological modeling in the Sono river basin, environmental protection region of the Jalapão, Brazilian savanna

Hydrological modeling in the Sono river basin, environmental protection region of the Jalapão, Brazilian savanna

Drought Assessment in the São Francisco River Basin Using Satellite-Based and Ground-Based Indices

Hydrological Retrospective and Historical Drought Analysis in a Brazilian Savanna Basin

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