Balanço hídrico em sistema hidrogeológico cárstico, região de Lagoa Santa, Minas Gerais

Paula, Rodrigo Sérgio de; Velásquez, Leila Nunes Menegasse

doi:10.14295/ras.v33i2.29252

Cited by 7 publications

(7 citation statements)

References 5 publications

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“…The results obtained vary between 1.03 × 10 −4 and 2.81 × 10 −2 . It is observed that, in general, the data agree with what was found through pumping tests and have a median value of 3.29 × 10 −3 using De Paula and Velásquez (2019) rc values, and 3.96 × 10 −3 using 4 hydrological years, for all basins.…”

Section: Resultssupporting

confidence: 82%

“…In the study area, typical karst features are observed, associated with the carbonate rocks of the Sete Lagoas Formation. The occurrence of sinkholes, depressions, conduits, caves, poljes, and other morphological features reflects an evolved karst environment (De Paula & Velásquez, 2019). In addition, some of these features indicate the temporal evolution of the relief, with significant dissolution and subsidence, being important controllers of local hydrogeology, affecting recharge and subsurface flow (Pessoa, 2005).…”

Section: Geological and Hydrogeological Contextmentioning

confidence: 99%

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Estimating transmissivity and storativity in a karst aquifer by direct and indirect methods

Pena,

de Paula,

Velasquez

et al. 2024

Hydrological Processes

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The karst aquifer located in the Environmental Protection Area of Lagoa Santa, Minas Gerais, Brazil, exhibits the characteristic morphological features of an evolved karst environment, including large caves, sinkholes, and copious springs. Understanding the hydrogeological characteristics of karst aquifers is crucial for effective management of public resources and prevention of contamination, as these aquifers are highly vulnerable, making it essential to identify and mitigate potential risks. Given the ongoing economic and population growth in this region, the assessment of the hydrogeological parameters that control the dynamics of local flow becomes relevant for the proper evaluation of hydrogeological models and the management of water resources. Four classical pumping test analysis methods were compared to quantify the flow and storativity of the aquifer: Theis (1935), Neuman (1972), Moench (1984), and Agarwal (1980). In addition, indirect estimation methods based on the identification of capture zones and the analysis of recession curves of water courses were employed, since these approaches are cheaper and easier to apply in areas with low information. The statistical analysis of the results suggests that classical solutions can be applied to the karst aquifer to estimate hydrogeological parameters, apart from the Storage Coefficient obtained using the Neuman method. In general, the indirect estimation methods tend to produce values that are consistent with those obtained through direct methods, albeit with some reservations. The transmissivity values obtained from the pumping tests were approximately 3.0 × 10−4 m2/s, while the storage coefficient is estimated to be around 3.7 × 10−3. The indirect estimation methods yield transmissivity values of about 1.8 × 10−4 m2/s using the capture zone method, and storage coefficient values of 4.0 × 10−3 and 3.9 × 10−2 using recession curve analysis.

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Section: Resultssupporting

confidence: 82%

Section: Geological and Hydrogeological Contextmentioning

confidence: 99%

Estimating transmissivity and storativity in a karst aquifer by direct and indirect methods

Pena,

de Paula,

Velasquez

et al. 2024

Hydrological Processes

View full text Add to dashboard Cite

show abstract

“…The analyzed data correspond to the monitoring performed from October 2016 to September 2017, equivalent to a regional hydrological year at Lagoa Santa station, which has more than 50% of influence on the evaluated area (Paula and Velásquez 2019).…”

Section: Methodsmentioning

confidence: 98%

“…This potential is based on the degree of fracture, specific capacity measured in the region's tubular wells, and other parameters. Paula and Velásquez (2019) pointed out the importance of exposed and fractured carbonate massif zones with aquifer recharge, reaching average values for the area of 119 mm for the hydrological year 2016/2017. Ribeiro et al (2019) describe how the groundwater flow of the region is influenced by horizontal planes and eastward fractures.…”

Section: Physical Characteristics Of the Study Areamentioning

confidence: 99%

“…The climatic water balance of the area performed for the same hydrological year of this study (Oct/2016 to Sep/2017) allowed obtaining actual evapotranspiration (AET) of 750 mm (74%), potential evapotranspiration (PET) of 895 mm, water surplus (WS) of 260 mm (26%), and water deficit (WD) of 145 mm, for a precipitation of 1,010 mm recorded at Lagoa Santa station (Paula and Velásquez 2019).…”

Section: Physical Characteristics Of the Study Areamentioning

confidence: 99%

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Method to complete flow rate data in automatic fluviometric stations in the karst system of Lagoa Santa area, MG, Brazil

Paula

Velásquez

2020

Braz. J. Geol.

Self Cite

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Data acquisition by automatic monitoring allows obtaining a large number of data, supporting a better understanding of the monitored region. The use of automated discharge measurement enables a better understanding of floods, the relationship between surface and groundwater flow rate values, and aquifer recharge. However, automatic instruments processing and storage may fail, leading to missing values in some intervals of the recorded time series. These missing values may be replaced by estimates from the regional flow rate or other statistical approximations. For evolved karst systems, however, those techniques may not be adequate due to their rapid discharge responses to rainfall. The aim of this paper is to develop a method able to estimate fluviometric monitoring missing values, based on time series correlation for correlated data. These estimates were obtained from automated monitoring through pressure transducers in 6 streams in a region of approximately 505 km 2 , predominantly covered by the carbonate and metapellitic Neoproterozoic rocks of the Bambuí Group. The proposed method is composed of four sequential steps: computing the streamflow-data autocorrelation and the cross-correlation of pluviometry with the flow rate; calculating the precipitation fraction that directly contributes to the discharge; fitting of a linear relationship between pluviometry and the monitored daily discharge, to calculate discharge values on days when automatic measurements failed; and approximation of the calculated and monitored discharge values, using a number of statistical criteria. The results show the maturity of the karst aquifer system, with fast groundwater flow and low storage, well-calibrated stage-discharge rating curves for the 2016/2017 hydrological year and that the values estimated by proposed methodology present a deviation of less than 9% over the monitored data.

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Environmental Problems in the Lagoa Santa Karst

Pessoa

Atman

Kimura

2020

Cave and Karst Systems of the World

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Balanço hídrico em sistema hidrogeológico cárstico, região de Lagoa Santa, Minas Gerais

Cited by 7 publications

References 5 publications

Estimating transmissivity and storativity in a karst aquifer by direct and indirect methods

Estimating transmissivity and storativity in a karst aquifer by direct and indirect methods

Method to complete flow rate data in automatic fluviometric stations in the karst system of Lagoa Santa area, MG, Brazil

Environmental Problems in the Lagoa Santa Karst

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