BALSEQ — A Model for the Estimation of Water Balances, Including Aquifer Recharges, Requiring Scarce Hydrologic Data

Ferreira, J.P. Lobo; Rodrigues, J. Delgado

doi:10.1007/978-94-015-7780-9_19

Cited by 3 publications

(3 citation statements)

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“…For calculating water recharge, we selected a numerical model which estimates the potential groundwater by means of the daily water balance calculation in the soil layer above the saturated zone. The model, BALSEQ, was developed by Lobo-Ferreira (1981) and used to estimate the recharge of unconfined aquifers in several areas in Europe (Lobo-Ferreira, 1981;Lobo-Ferreira and Delgado-Rodrigues, 1998;Paralta et al, 2003;Oliveira, 2004). The BALSEQ with modifications, developed by Oliveira (2004), was later used by Lobo-Ferreira et al (2015) and Hugman et al (2017).…”

Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Potential Groundwater Recharge: the Case of the Doce River Basin, Brazil

Souza

Pontes

Filho

et al. 2019

Rev. Bras. Ciênc. Solo

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Section: Introductionmentioning

confidence: 99%

Spatial and Temporal Potential Groundwater Recharge: the Case of the Doce River Basin, Brazil

Souza

Pontes

Filho

et al. 2019

Rev. Bras. Ciênc. Solo

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“…1. In four of these basins (São Vicente, Socorridos, Brava e Machico), a total of 11 precipitation records were available from meteorological stations, and water balances have been calculated (Novo et al, 1994) from these data using the BALSEQ method of Ferreira and Rodrigues (1987). The results of the water balances of the basins were then used as proxies of the balances at the scale Fig.…”

Section: Hydrologymentioning

confidence: 99%

Hydrochemistry, weathering and weathering rates on Madeira island

Weijden

Pacheco

2003

Journal of Hydrology

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Madeira island consists of Miocene to Pleistocene lavas and pyroclasts. Major rock types are alkali-basalts, basanites and hawaiites; principal soil types are leptosols, andosols and cambisols. Our main objective was to link the chemistry of ground waters to weathering reactions and rates. We collected 40 shallow groundwater samples, remote from human activities. With a few exceptions, the ranges of electrical conductivities were 29 -176 mS/cm and of pH 5.8-8.5. The calculated P CO 2 was generally higher than the atmospheric value. The contribution of sea salt to the water chemistry was 30^9%. Corrected for sea salt, the cation concentrations (in meq/l) decrease in the order CaThe concentrations of SO 4 22 and NO 3 2 are very low. We calculated that the total annual chemical denudation rate in the studied area amounts to 37^12 g/m 2 , consuming 0.86^0.38 mol CO 2 /m 2 . To achieve our main objective, a set of mole balance equations-ðAX ¼ BÞ-was used, where A is a composite matrix of coefficients, including ratios between stoichiometric coefficients as determined by the weathering reactions and coefficients accounting for unconstrained contributions, B is the vector with a water composition, and X is the set of mole fractions of dissolved primary minerals plus the residual concentrations of the unconstrained contributions. Olivine (Ol), pyroxene (Py) and plagioclase (Pl) were considered to be the major primary minerals, and smectite, vermiculite, halloysite, allophane, gibbsite and hematite the secondary minerals in the weathering reactions. Using iterative procedures, whereby mixtures of secondary products as well as the composition of plagioclase are allowed to change, we selected one best-fit set of weathering reactions for each spring by checking all possible solutions of the mole balances against predefined boundary conditions. At odds with Goldich (1938) sequence, our model results indicate-for most best -fit sets-a weathering rate sequence of Pl . Ol . Py, but such reverse order is not unique. On average, the annual weathering rates (in mol/(ha y vol% mineral)) are 44^19 (Pl), 29^14 (Ol) and 22^13 (Py). q

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“…The pollution vulnerability can be defined as 'the sensitivity of groundwater quality to an imposed contaminant load' depending only on the 'proper characteristic of the aquifer'. The vulnerability is relatively static, excluding some variation over time due, e.g., to the piezometric level changes [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Variability of Intrinsic Groundwater Vulnerability to Pollution in River Valley due to Groundwater Depth and Recharge Changes

2019

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Groundwater management can be effectively implemented by assessment of groundwater vulnerability to pollution. The research was carried out in the Vistula River valley (Poland) in an area of shallow groundwater occurrence, defined as a Groundwater-Dependent Ecosystem area. The goal of this study was to identify the average, maximum, and minimum depths of the groundwater table for variant assessment of groundwater vulnerability to contamination. The variants correspond to the average vulnerability, the vulnerability during hydrogeological drought, and the vulnerability during the flood risk period. Theoretical and effective weights of vulnerability parameters were calculated using the DRASTIC method. Vulnerability maps constructed for the various vulnerability variants and by using different parameter weights show the spatial variability of the individual vulnerability classes. Due to the specifics of this protected area, the expected dependency between vulnerability index and chloride concentrations in the monitoring points was not found. Comparison showed strong dependency of water chemistry and the value of recharge, lithology of aquifer, and unsaturated zone. The research results confirm the need for variant vulnerability assessment to protect against floods or predict the effects of climate change.

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BALSEQ — A Model for the Estimation of Water Balances, Including Aquifer Recharges, Requiring Scarce Hydrologic Data

Cited by 3 publications

References 0 publications

Spatial and Temporal Potential Groundwater Recharge: the Case of the Doce River Basin, Brazil

Spatial and Temporal Potential Groundwater Recharge: the Case of the Doce River Basin, Brazil

Hydrochemistry, weathering and weathering rates on Madeira island

Variability of Intrinsic Groundwater Vulnerability to Pollution in River Valley due to Groundwater Depth and Recharge Changes

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