The geochemistry and mixing of leakage in a semi-confined aquifer at a municipal well field, Memphis, Tennessee, USA

Larsen, Daniel; Gentry, Randall W.; Solomon, D. Kip

doi:10.1016/s0883-2927(02)00204-4

Cited by 45 publications

(108 citation statements)

References 23 publications

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“…In order to understand such processes, the 2D cross-sectional potable aquifer model was designed as shown in Figure 3. The potable aquifer was assumed to be relatively deep (300 m with a reducing condition), where the municipal or high-capacity wells produced a large amount of groundwater, which was then distributed for residential purposes [48,49]. In addition, the width and thickness of the potable aquifer were assigned as 200 m and 40 m, respectively, with the size of grid blocks of 2 m; the total number of grid blocks was 2,000 (100 × 20).…”

Section: Model Descriptionmentioning

confidence: 99%

CO₂ Leakage-Induced Contamination in Shallow Potable Aquifer and Associated Health Risk Assessment

et al. 2018

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Leakage of stored CO 2 from a designated deep reservoir could contaminate overlying shallow potable aquifers by dissolution of arsenic-bearing minerals. To elucidate CO 2 leakage-induced arsenic contamination, 2D multispecies reactive transport models were developed and CO 2 leakage processes were simulated in the shallow groundwater aquifer. Throughout a series of numerical simulations, it was revealed that the movement of leaked CO 2 was primarily governed by local flow fields within the shallow potable aquifer. The induced low-pH plume caused dissolution of aquifer minerals and sequentially increased permeabilities of the aquifer; in particular, the most drastic increase in permeability appeared at the rear margin of CO 2 plume where two different types of groundwater mixed. The distribution of total arsenic (∑As) plume was similar to the one for the arsenopyrite dissolution. The breakthrough curve of ∑As monitored at the municipal well was utilized to quantify the human health risk. In addition, sensitivity studies were conducted with different sorption rates of arsenic species, CO 2 leakage rates, and horizontal permeability in the aquifer. In conclusion, the human health risk was influenced by the shape of ∑As plume, which was, in turn, affected by the characteristics of CO 2 plume behavior such as horizontal permeability and CO 2 leakage rate.

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Section: Model Descriptionmentioning

confidence: 99%

CO₂ Leakage-Induced Contamination in Shallow Potable Aquifer and Associated Health Risk Assessment

et al. 2018

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“…During this time, plants were fertilized weekly with 500 ml of 20-20-20 Peter's fertilizer mixed with tap water at 1Ð25 g/l. More information about the geochemistry of the municipal water source is available in Larsen et al (2003). The study was terminated 56 days after treatment initiation.…”

Section: Experimental Designmentioning

confidence: 99%

Hydrology and species‐specific effects of Bacopa monnieri and Leersia oryzoides on soil and water chemistry

et al. 2009

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In an 8-week greenhouse experiment, Bacopa monnieri (water hyssop) and Leersia oryzoides (rice cutgrass) were compared for nutrient assimilation as well as soil and water chemistry under variable flooding regimes using a nutrient solution rich in nitrogen (N) and phosphorus (P). Soil redox potential decreased in flooded treatments; however, mesocosms containing B. monnieri remained aerobic for much of the study, while flooded mesocosms containing L. oryzoides became moderately reduced. Soils containing L. oryzoides were higher in nitrogen. Generally, effluent concentrations of PO 4 3 were higher in B. monnieri mesocosms. B. monnieri immobilization of N and P was significantly less in below-ground tissues than L. oryzoides. P immobilization in L. oryzoides generally increased in response to flooding, while B. monnieri showed no detectable response. Results indicated that species-specific flood responses in plant nutrient status are due to differing interactions of B. monnieri and L. oryzoides with the soil environment. Additionally, L. oryzoides demonstrated greater P uptake than B. monnieri across treatments, resulting in decreased concentrations of PO 4 3 in effluent. Although N was also affected by flooding and species, generalizations on N allocation within the system are difficult to describe due to the changes in species of N in response to oxidation-reduction gradients and biotic assimilation.

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“…Measurements of noble gases, stable isotopes of water, Cl and 14 C provided evidence for localised downward leakage of shallow groundwater in the Upper Floridan aquifer system, USA (Clark et al 1997). He ratios in combination with major ion geochemical reaction modelling were used to determine downward leakage into the Memphis aquifer, USA (Larsen et al 2003). Upward inter-aquifer leakage in the vicinity of faults has been identified by radiogenic 4 He in the Lower Rhine Embayment, Germany (Gumm et al 2016) and by He ratios in the Kazan Basin, Turkey (Arslan et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Detecting inter-aquifer leakage in areas with limited data using hydraulics and multiple environmental tracers, including 4He, 36Cl/Cl, 14C and 87Sr/86Sr

et al. 2017

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The investigation of regionally extensive groundwater systems in remote areas is hindered by a shortage of data due to a sparse observation network, which limits our understanding of the hydrogeological processes in arid regions. The study used a multidisciplinary approach to determine hydraulic connectivity between the Great Artesian Basin (GAB) and the underlying Arckaringa Basin in the desert region of Central Australia. In order to manage the impacts of groundwater abstraction from the Arckaringa Basin, it is vital to understand its connectivity with the GAB (upper aquifer), as the latter supports local pastoral stations and groundwaterdependent springs with unique endemic flora and fauna. The study is based on the collation of available geological information, a detailed analysis of hydraulic data, and data on environmental tracers. Enhanced inter-aquifer leakage in the centre of the study area was identified, as well as recharge to the GAB from ephemeral rivers and waterholes. Throughout the rest of the study area, inter-aquifer leakage is likely controlled by diffuse inter-aquifer leakage, but the coarse spatial resolution means that the presence of additional enhanced inter-aquifer leakage sites cannot be excluded. This study makes the case that a multi-tracer approach along with groundwater hydraulics and geology provides a tool-set to investigate enhanced inter-aquifer leakage even in a groundwater basin with a paucity of data. A particular problem encountered in this study was the ambiguous interpretation of different age tracers, which is attributed to diffusive transport across flow paths caused by low recharge rates.

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The geochemistry and mixing of leakage in a semi-confined aquifer at a municipal well field, Memphis, Tennessee, USA

Cited by 45 publications

References 23 publications

CO₂ Leakage-Induced Contamination in Shallow Potable Aquifer and Associated Health Risk Assessment

CO₂ Leakage-Induced Contamination in Shallow Potable Aquifer and Associated Health Risk Assessment

Hydrology and species‐specific effects of Bacopa monnieri and Leersia oryzoides on soil and water chemistry

Detecting inter-aquifer leakage in areas with limited data using hydraulics and multiple environmental tracers, including 4He, 36Cl/Cl, 14C and 87Sr/86Sr

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The geochemistry and mixing of leakage in a semi-confined aquifer at a municipal well field, Memphis, Tennessee, USA

Cited by 45 publications

References 23 publications

CO2 Leakage-Induced Contamination in Shallow Potable Aquifer and Associated Health Risk Assessment

CO2 Leakage-Induced Contamination in Shallow Potable Aquifer and Associated Health Risk Assessment

Hydrology and species‐specific effects of Bacopa monnieri and Leersia oryzoides on soil and water chemistry

Detecting inter-aquifer leakage in areas with limited data using hydraulics and multiple environmental tracers, including 4He, 36Cl/Cl, 14C and 87Sr/86Sr

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Product

Resources

About

CO₂ Leakage-Induced Contamination in Shallow Potable Aquifer and Associated Health Risk Assessment

CO₂ Leakage-Induced Contamination in Shallow Potable Aquifer and Associated Health Risk Assessment