Drought severity indexes for the Tocantins River Basin, Brazil

Junqueira, Rubens; Viola, Marcelo Ribeiro; Mello, Carlos Rogério de; Vieira-Filho, Marcelo; Alves, Marcos Vinícius Giongo; Amorim, Jhones da Silva

doi:10.1007/s00704-020-03229-w

Cited by 16 publications

(24 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the Euclydes et al [31] classification, the PRB has a high natural regularization capacity once SY 7,10 corresponds to 33% of SY mean , which follows the α value close to zero (0.0073). The α is close to that obtained by Freitas and Bacellar [32] in sub-basins of the upper São Francisco River and by Junqueira et al [12] in the Tocantins river basin. From the flow-duration curve (Figure 2B), Q 90% and Q 95% was equal to 9.7 and 7.7 m 3 s −1 , respectively, which generated SY 90 equal to 3.0 L s −1 km −2 and SY 95 equal to 2.4 L s −1 km −2 , higher than SY 7,10 .…”

Section: Hydrological Behaviorsupporting

confidence: 90%

“…Besides the reduction in precipitation, the increase in temperature and, consequently, in evapotranspiration, contributed to the hydrological drought intensification, as highlighted by Van Loon [7] and Junqueira et al [12]. According to data obtained from the Brazilian National Institute of Meteorology (INMET) using a weather station close to the basin (Januária station), the daily annual average temperature from 1977/78 to 2012/13 was 23.4 • C, however, from 2013/14 to 2017/18 there was an increase of 1.3 • C. Thus, the ETR in this period was equal to 88.4%, higher than the average observed in the studied period (81.4%).…”

Section: Meteorological and Hydrological Droughtsmentioning

confidence: 97%

See 1 more Smart Citation

Hydrological Response to Drought Occurrences in a Brazilian Savanna Basin

et al. 2020

Self Cite

View full text Add to dashboard Cite

The Brazilian savanna is one of the world’s 25 biodiversity hotspots. However, droughts can decrease water availability in this biome. This study aimed to analyze meteorological and hydrological droughts and their influence on the hydrological behavior in a Brazilian savanna basin. For that, hydrological indicators were calculated to analyze the hydrological behavior in the Pandeiros river basin (PRB). The Standardized Precipitation Index (SPI) and Standardized Streamflow Index (SSI) were calculated for the hydrological year and rainy season from 1977 to 2018. The propagation of the meteorological to hydrological drought was studied by means of the Pearson coefficient of correlation between the SSI and SPI with 0, 3, 6, 9, and 12-month lags. A longer meteorological drought was observed from 2014/15 to 2017/18 which caused a reduction in the groundwater recharge, besides potentially reducing the ecological functions of the Brazilian savanna. This drought was intensified by an increase in the average annual temperature, resulting in the increasing of evapotranspiration. Regarding drought propagation, there is no significant difference among the coefficients of correlation from 0 to 6-month lags. For the lags of 9 and 12 months, the correlation decreases, indicating a greater influence of the current rainy season than the past ones.

show abstract

Section: Hydrological Behaviorsupporting

confidence: 90%

Section: Meteorological and Hydrological Droughtsmentioning

confidence: 97%

Hydrological Response to Drought Occurrences in a Brazilian Savanna Basin

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…SSFI is calculated by fitting the gamma probability function (GPF) on the accumulated non-exceedance frequency of the stationarity historical series and then applying the Gauss distribution inverse, thus resulting in the SSFI values. SSFI is classified as extremely dry (ED) (SSFI ≤ −2.0), severely dry (SD) (−2.0 < SFFI ≤ −1.5), moderately dry (MD) (−1.5 < SSFI ≤ -1.0), normal (N) (−1.0 < SSFI ≤ 1), moderately wet (MW) (1.0 < SSFI ≤ 1.5), very wet (VW) (1.5 < SSFI ≤ 2.0), and extremely wet (EW) (SSFI ≥ 2.0) [44].…”

Section: Assessment Of the Hydrological Impactsmentioning

confidence: 99%

“…Table 4 shows the SSFI thresholds followed by the respective classification [44] and the runoff and return period calculated for each class for the GRB-Furnas basin.…”

Section: Hydrological Drought Assessmentmentioning

confidence: 99%

Climate Change Impacts on Water Resources of the Largest Hydropower Plant Reservoir in Southeast Brazil

Mello

Vieira

Guzmán

et al. 2021

Water

Self Cite

View full text Add to dashboard Cite

Approximately 70% of all the electric energy produced in Brazil comes from hydropower plants. In this context, the Grande River Basin (GRB) stands out in Brazil. Some studies have been carried out to investigate the impacts of climate change in tropical regions to support water resources’ management and planning. This study aims to project the changes in the runoff that feed the Furnas Hydropower Plant (FHP) reservoir (GRB-Furnas basin), the largest and most important facility in Southeast Brazil. The lavras simulation of hydrology model (LASH) was used to project the impacts on runoff and hydrological droughts over the century in GRB-Furnas. The regional climate models (RCMs) Eta-HadGEM-ES, Eta-MIROC5, and Eta-CanESM2 forced the LASH model from 2007 to 2099, taking the representative concentration pathways (RCPs) 4.5 and 8.5. LASH simulated the runoff adequately for the baseline period (1961–2005) using the RCMs’ outputs. A noticeable reduction in precipitation was identified in the wet season, especially in the 2007–2040 period for RCP4.5 and in the 2071–2099 period for RCP8.5. As a result, a significant reduction in the runoff, mainly in the baseflow, and an increase in droughts’ severity were projected throughout the XXI Century, which may compromise the water security to the FHP reservoir.

show abstract

“…It is possible to observe that the 95PPU band did not include the recessions that occurred in the years 2015 and 2016 the observed data. In these years, Junqueira et al [77] observed one of the most severe droughts in the basin for the 1987-2017 period, which may have affected SWAT performance.…”

Section: Swat Performance Evaluationmentioning

confidence: 99%

Evaluation of Satellite Precipitation Products for Hydrological Modeling in the Brazilian Cerrado Biome

Amorim

Viola

Junqueira

et al. 2020

Water

Self Cite

View full text Add to dashboard Cite

This study investigates the applicability of Satellite Precipitation Products (SPPs) in streamflow simulations performed in the Brazilian Cerrado biome, which is one of the world’s biodiversity hotspots. Local data from ground observations were used as a reference for evaluating the Tropical Rainfall Measuring Mission (TRMM) Multi-satellite Precipitation Analysis (TMPA) and Integrated Multi-Satellite Retrievals for Global Precipitation Measurement (IMERG). The Soil and Water Assessment Tool (SWAT) was used to simulate the streamflow in a subbasin of the Tocantins river basin. Statistical precision metrics showed that both SPPs presented a satisfactory performance for precipitation monitoring on a monthly scale, in which IMERG performed better than TMPA. The Nash–Sutcliff coefficient and Kling–Gupta efficiency obtained for both calibration and validation period were greater than 0.82 and 0.79, respectively, demonstrating that both SPPs were able to simulate the hydrological regime adequately. However, the bias indicated that the SPPs overestimated the observed streamflow. The r-factor and p-factor values showed that both TMPA and IMERG presented low uncertainty in streamflow simulations. SPPs offer a great alternative for monitoring the precipitation and hydrological studies in the Brazilian Cerrado biome, and presented better simulation results than rain gauges.

show abstract

Drought severity indexes for the Tocantins River Basin, Brazil

Cited by 16 publications

References 58 publications

Hydrological Response to Drought Occurrences in a Brazilian Savanna Basin

Hydrological Response to Drought Occurrences in a Brazilian Savanna Basin

Climate Change Impacts on Water Resources of the Largest Hydropower Plant Reservoir in Southeast Brazil

Evaluation of Satellite Precipitation Products for Hydrological Modeling in the Brazilian Cerrado Biome

Contact Info

Product

Resources

About