Recharge contribution to the Guarani Aquifer System estimated from the water balance method in a representative watershed

Wendland, Edson; Gomes, Luís H.; Troeger, Uwe

doi:10.1590/0001-3765201520140062

Cited by 34 publications

(23 citation statements)

References 27 publications

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“…; Wendland et al. ). The low runoff (Qs) values are related to the predominantly sandy soil texture in the area, allowing high infiltration rates.…”

Section: Resultsmentioning

confidence: 98%

Aquifer Responses to Rainfall through Spectral and Correlation Analysis

Gómez¹,

Melo²,

Rodrigues

et al. 2018

J American Water Resour Assoc

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The response time of hydrological components is an important feature for establishing the connections within a hydrological system and for characterizing it. This study proposes a quantitative and qualitative assessment on the response times of river discharge components, especially the baseflow, regarding the impulse provided by precipitation, using time series analyses of time and frequency domains. To this end, a set of complementary methods including correlation and spectral approaches was used, which are: autocorrelation, cross correlation, continuous wavelet transform, and cross wavelet transform. Such framework was applied in multiple and nested basin scales (53, 1,867, and 3,519 km2), located in the Jacaré‐Guaçu River Basin (Southeastern Brazil). Based on a digital filtering technique, it was found the baseflow contributes more than 80% of the annual streamflow, revealing a major role of the aquifer in regulating the river discharge in all three studied basins. In addition, we found baseflow represents a range of 24%–27% of the annual precipitation. The uniform results are mainly due to the similar physical characteristics found in those areas. Overall, our framework indicates a baseflow response time for a precipitation of approximately two years for the smaller basins and three years for the biggest one. Such results can support the water allocation in conjunctive water management, by providing estimates of future surface water availability.

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“…; Wendland et al. ). The low runoff (Qs) values are related to the predominantly sandy soil texture in the area, allowing high infiltration rates.…”

Section: Resultsmentioning

confidence: 98%

Aquifer Responses to Rainfall through Spectral and Correlation Analysis

Gómez¹,

Melo²,

Rodrigues

et al. 2018

J American Water Resour Assoc

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“…The specific yield (S y ) at the Onça Creek watershed (Table 1) was determined during campaigns to collect undisturbed soil samples at five locations and at 10 different depths that correspond to the watertable fluctuation (Wendland et al 2015). The undisturbed samples were analyzed using the Haines funnel technique (Haines 1930) as described by Wendland et al (2015).…”

Section: Ground Datamentioning

confidence: 99%

Evaluation of remotely sensed data for estimating recharge to an outcrop zone of the Guarani Aquifer System (South America)

et al. 2015

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The Guarani Aquifer System (GAS) is the largest transboundary groundwater reservoir in South America, yet recharge in the GAS outcrop zones is one of the least known hydrological variables. The objective of this study was to assess the suitability of using remote sensing data in the water-budget equation for estimating recharge inter-annual patterns in a representative GAS outcropping area. Data were obtained from remotely sensed estimates of precipitation (P) and evapotranspiration (ET) using TRMM 3B42 V7 and MOD16, respectively, in the Onça Creek watershed in Brazil over the 2004-2012 period. This is an upland flat watershed (slope steepness <1 %) dominated by sandy soils and representative of the GAS outcrop zones. The remote sensing approach was compared to the water-table fluctuation (WTF) method and another water-budget equation using ground-based measurements. On a monthly basis, the TRMM P estimate showed significant agreement with the ground-based P data (r=0.93 and RMSE=41 mm). Mean(±SD) satellite-based recharge (R sat ) was 537(±224) mm year −1 . Mean ground-based recharge using the waterbudget (R gr ) and the WTF (R wtf ) methods were 469 mm year −1 and 311(±75) mm year −1 , respectively. Results show that 440 mm year −1 is a mean (between R sat , R gr and R wtf ) recharge for the study area over the 2004-2012 period. The latter mean recharge estimate is about 29 % of the mean historical P (1,514 mm year −1 ). These results are useful for future studies on assessing recharge in the GAS outcrop zones where data are scarce or nonexistent.

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“…However, the recharge estimates and flow simulation must be validated for the effective conditions of the Guarani Aquifer System. For this validation, data measured in situ in one of the areas with representative characteristics of the GAS recharge zone were used: Ribeirão da Onça watershed (ROW), in which the research group of the Computational Hydraulics Laboratory (Laboratório de Hidráulica Computacional -LHC) continually performs biweekly monitoring of the levels in the unconfined aquifer (Wendland et al, 2007;Lucas et al, 2012;Wendland et al, 2014), and the data can be used to quantify these processes.…”

Section: Introductionmentioning

confidence: 99%

Estimate of Groundwater Recharge Based on Water Balance in The Unsaturated Soil Zone

Melo

Wendland

Guanabara

2015

Rev. Bras. Ciênc. Solo

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Groundwater management depends on the knowledge on recharge rates and water fluxes within aquifers. The recharge is one of the water cycle components most difficult to estimate. as a result, despite the chosen method, the estimates are subject to uncertainties that can be identified by means of comparison with other approaches. In this study, groundwater recharge estimates based on the water balance in the unsaturated zone is assessed. firstly, the approach is evaluated by comparing the results with those of another method. then, the estimates are used as inputs in a transient groundwater flow model in order to assess how the water table would respond to the obtained recharges rates compared to measured levels. the results suggest a good performance of the adopted approach and, despite some inherent limitations, it has advantages over other methods since the data required are easier to obtain. Keywords

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Recharge contribution to the Guarani Aquifer System estimated from the water balance method in a representative watershed

Cited by 34 publications

References 27 publications

Aquifer Responses to Rainfall through Spectral and Correlation Analysis

Aquifer Responses to Rainfall through Spectral and Correlation Analysis

Evaluation of remotely sensed data for estimating recharge to an outcrop zone of the Guarani Aquifer System (South America)

Estimate of Groundwater Recharge Based on Water Balance in The Unsaturated Soil Zone

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