Groundwater ages in coastal aquifers

Post, Vincent; Vandenbohede, Alexander; Werner, Adrian D.; Maimun,; Teubner, Michael

doi:10.1016/j.advwatres.2013.03.011

Cited by 72 publications

(38 citation statements)

References 36 publications

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“…This agrees with the findings by Post et al (2013) based on simulation of synthetic groundwater age patterns in coastal aquifers using density-driven flow.…”

supporting

confidence: 82%

“…Similarly, sea level changes that were disregarded in this study would have an effect on the groundwater age distribution in the coastal areas. Prescribing a vertical coastal age boundary of zero years is another simplification that neglects the vertical mixing and dispersion, which would result in an increase of age with depth (Post et al 2013). However, since these physical processes were difficult to quantify, estimating age at this boundary would be highly uncertain.…”

Section: Boundary Conditionsmentioning

confidence: 99%

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Estimation of effective porosity in large-scale groundwater models by combining particle tracking, auto-calibration and <sup>14</sup>C dating

Meyer¹,

Engesgaard²,

Hinsby³

et al. 2018

Preprint

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Abstract. Effective porosity plays an important role in contaminant management. However, the effective porosity is often assumed constant in space and hence either neglected or simplified in transport model calibration. Based on a calibrated highly parametrized flow model, a three-dimensional advective transport model (MODPATH) of a 1300 km is improved significantly by the calibration of seven porosity units by a reduction of ME of 99% and RMS of 82% compared to a uniform porosity approach. Groundwater ages range from a few hundred years in the Pleistocene to several thousand years in Miocene aquifers. The advective age distributions derived from particle tracking at each sampling well show unimodal (for 10 younger ages) to multimodal (for older ages) shapes and thus reflect the heterogeneity that particles encounter along their travel path. The estimated effective porosity field, with values ranging between 4.3% in clay and 45% in sand formations, is used in a direct simulation of distributed mean groundwater ages. Although the absolute ages are affected by various uncertainties, a unique insight into the complex three-dimensional age distribution pattern and potential advance of young contaminated groundwater in the investigated regional aquifer system is provided, highlighting the importance of estimating effective porosity 15 in groundwater transport modelling and the implications for groundwater quantity and quality assessment and management.

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“…This agrees with the findings by Post et al (2013) based on simulation of synthetic groundwater age patterns in coastal aquifers using density-driven flow.…”

supporting

confidence: 82%

Section: Boundary Conditionsmentioning

confidence: 99%

Estimation of effective porosity in large-scale groundwater models by combining particle tracking, auto-calibration and <sup>14</sup>C dating

Meyer¹,

Engesgaard²,

Hinsby³

et al. 2018

Preprint

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show abstract

“…The travel pathway and residence times for density-driven recirculation depends on the hydrogeology of the CUA but they are generally long with residences times varying from an order of 100 d to over tens of thousands of years [Robinson et al, 2007b;Post et al, 2013]. This provides significant time for reactions to occur including aquifer sediment transformations such as carbonate diagenesis [Back et al, 1979].…”

Section: Densitymentioning

confidence: 99%

Groundwater dynamics in subterranean estuaries of coastal unconfined aquifers: Controls on submarine groundwater discharge and chemical inputs to the ocean

Robinson¹,

Xin²,

Santos³

et al. 2018

Advances in Water Resources

216

148

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Sustainable coastal resource management requires sound understanding of interactions between coastal unconfined aquifers and the ocean as these interactions influence the flux of chemicals to the coastal ocean and the availability of fresh groundwater resources. The importance of submarine groundwater discharge in delivering chemical fluxes to the coastal ocean and the critical role of the subterranean estuary (STE) in regulating these fluxes is well recognized. STEs are complex and dynamic systems exposed to various physical, hydrological, geological, and chemical conditions that act on disparate spatial and temporal scales. This paper provides a review of the effect of factors that influence flow and salt transport in STEs, evaluates current understanding on the interactions between these influences, and synthesizes understanding of drivers of nutrient, carbon, greenhouse gas, metal and organic contaminant fluxes to the ocean.Based on this review, key research needs are identified. While the effects of density and tides are well understood, episodic and longer-period forces as well as the interactions between multiple influences remain poorly understood. Many studies continue to focus on idealized nearshore aquifer systems and future work needs to consider real world complexities such as geological heterogeneities, and non-uniform and evolving alongshore and cross-shore morphology. There is also a significant need for multidisciplinary research to unravel the interactions between physical and biogeochemical processes in the STE, as most existing studies treat these processes in isolation. Better understanding of this complex and dynamic system can improve sustainable management of coastal water resources under the influence of anthropogenic pressures and climate change.

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“…It is also a powerful integrative approach of groundwater origin and flow path organisation within aquifers (Anders et al, 2014;Bertrand et al, 2010;Gooddy et al, 2006;Jaunat et al, 2012;Kamtchueng et al, 2015). Furthermore, groundwater residence time provides information to constrain recharge area, discharge rate, flow directions and velocities, all necessary to either quantitatively validate a numerical or conceptual hydrogeological model Post et al, 2013;Turnadge and Smerdon, 2014;Zuber et al, 2005). When groundwater residence times are over timescale of 0-70 years, dating tools such as tritium, chlorofluorocarbons (CFCs) or sulphur hexafluoride (SF 6 ) may be used (Aeschbach-Hertig et al, 1998;Alvarado et al, 2005;Cook and Solomon, 1997;Corcho Alvarado et al, 2007;Delbart et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Santoni

Huneau

Garel

et al. 2016

Journal of Hydrology

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Groundwater ages in coastal aquifers

Cited by 72 publications

References 36 publications

Estimation of effective porosity in large-scale groundwater models by combining particle tracking, auto-calibration and <sup>14</sup>C dating

Estimation of effective porosity in large-scale groundwater models by combining particle tracking, auto-calibration and <sup>14</sup>C dating

Groundwater dynamics in subterranean estuaries of coastal unconfined aquifers: Controls on submarine groundwater discharge and chemical inputs to the ocean

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

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Groundwater ages in coastal aquifers

Cited by 72 publications

References 36 publications

Estimation of effective porosity in large-scale groundwater models by combining particle tracking, auto-calibration and &lt;sup&gt;14&lt;/sup&gt;C dating

Estimation of effective porosity in large-scale groundwater models by combining particle tracking, auto-calibration and &lt;sup&gt;14&lt;/sup&gt;C dating

Groundwater dynamics in subterranean estuaries of coastal unconfined aquifers: Controls on submarine groundwater discharge and chemical inputs to the ocean

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Contact Info

Product

Resources

About

Estimation of effective porosity in large-scale groundwater models by combining particle tracking, auto-calibration and <sup>14</sup>C dating

Estimation of effective porosity in large-scale groundwater models by combining particle tracking, auto-calibration and <sup>14</sup>C dating