Groundwater travel times for unconfined island aquifers bounded by freshwater or seawater

Chesnaux, Romain; Allen, D. M.

doi:10.1007/s10040-007-0241-6

Cited by 31 publications

(39 citation statements)

References 13 publications

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“…Dune areas as freshwater reservoirs with regard to problems of salinization, freshening, decalcification, atmospheric pollution and artificial recharge have been studied intensely by Stuyfzand (1993). Moreover, analytical solutions exist on the geometry of a freshwater lens (Vacher, 1988;Van der Veer, 1977;Fetter, 1972) as well as travel times within the lens (Vacher et al, 1990;Chesnaux and Allen, 2008. Still, not much is known about the groundwater ages, recharge rates and hydrogeochemical evolution of Spiekeroogs or similar barrier island freshwater reservoirs. This study combines age dating with 3 H- 3 He, stable isotope and major ion analysis of precipitation, surface water and groundwater in order to generate a compact overview of the hydrological system of a barrier island.…”

Section: Introductionmentioning

confidence: 99%

Groundwater ages, recharge conditions and hydrochemical evolution of a barrier island freshwater lens (Spiekeroog, Northern Germany)

Röper

Kröger

Meyer

et al. 2012

Journal of Hydrology

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Section: Introductionmentioning

confidence: 99%

Groundwater ages, recharge conditions and hydrochemical evolution of a barrier island freshwater lens (Spiekeroog, Northern Germany)

Röper

Kröger

Meyer

et al. 2012

Journal of Hydrology

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“…In this manner, the travel time between two positions located along the flow line may be calculated, r i and x i being the initial position (time = 0), and r and x, the position of the water particle at time t. For circular lenses, the problem is solved between r i = 0 to r = R, whereas for the longitudinal ones it is between x i = 0 to x = L. The thickness of the freshwater lens is given by the addition of the height of the water table (h) and the depth of the interface (z) (Chesnaux & Allen, 2008). Abbreviations ccp and scp indicate circular and strip lenses, respectively, discharging to the coastal plain.…”

Section: Estimation Of Travel Timementioning

confidence: 99%

“…The travel time of the groundwater flow through the freshwater lenses was calculated according to the solutions proposed by Chesnaux & Allen (2008) for oceanic and inland islands.…”

Section: Estimation Of Travel Timementioning

confidence: 99%

“…Analytical solutions to estimate the travel time of groundwater flow have been developed by several authors for confined aquifers with regional flow (Bear & Jacobs, 1965;Grubb, 1993), unconfined aquifers with pumping conditions and without recharge (Simpson et al, 2003;Chapuis & Chesnaux, 2006), unconfined aquifers without pumping conditions and with recharge by infiltration (Chesnaux et al, 2005), and unconfined aquifers without pumping and with recharge by infiltration in oceanic islands and inland islands with both circular and strip morphology (Chesnaux & Allen, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this work is to estimate the groundwater travel time in these freshwater lenses by using the model developed by Chesnaux & Allen (2008) for oceanic and inland islands. The use of this analytical method is suggested in order to describe the hydrological dynamics in the actual system studied.…”

Section: Introductionmentioning

confidence: 99%

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Groundwater travel time in the freshwater lenses of Samborombón Bay, Argentina

Carol

Kruse

Roig

2010

Hydrological Sciences Journal

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The Samborombón Bay area (Argentina) is a coastal plain environment that contains groundwater resources with high salinity. In addition, there are local freshwater lenses associated with shell ridges and sand sheets in the region. In this work, the groundwater travel time in these freshwater lenses is estimated based on their geological conditions, which include hydraulic conductivity, recharge, morphology and discharge to surface freshwater or to saline groundwater. Groundwater travel times in the freshwater lenses were calculated from the equations developed by Chesnaux and Allen. The travel times estimated for the different scenarios were relatively short. The results indicate that the groundwater flow tends to be strongly dependent on the recharge conditions, with an excess of water in the water balance. The results can be applied to help design sustainable management methods to exploit this water resource system and also to assess the impact of contaminant plumes on this groundwater resource.Key words groundwater flow; freshwater resource; Argentina Temps de transfert hydrogéologique dans les lentilles d'eau douce de la Baie de Samborombón, Argentine Résumé La zone de la Baie de Samborombón (Argentine) est un environnement de plaine côtière qui contient des ressources en eaux souterraines dont la salinité est élevée. En outre, il existe des lentilles d'eau douce locales associées aux crêtes de coquillages et feuilles de sable dans la région. Dans ce travail, le temps de transfert des eaux souterraines dans ces lentilles d'eau douce est estimé en fonction de leurs conditions géologiques, notamment la conductivité hydraulique, la recharge, la morphologie et la décharge vers les eaux de surface ou vers les eaux souterraines salines. Les temps de transfert des eaux souterraines dans les lentilles d'eau douce ont été calculés à partir des équations développées par Chesnaux et Allen. Les temps de transfert estimés pour les différents scénarios sont relativement faibles. Les résultats indiquent que l'écoulement des eaux souterraines a tendance à être fortement dépendant des conditions de recharge, avec un excès d'eau dans le bilan hydrologique. Les résultats peuvent être appliqués pour aider à concevoir des méthodes de gestion durable pour l'exploitation de ce système de ressources en eau et aussi pour évaluer l'impact de panaches de contaminants sur cette ressource en eaux souterraines.

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Sea‐level rise impact on fresh groundwater lenses in two‐layer small islands

Ketabchi

Mahmoodzadeh

Ataie-Ashtiani

et al. 2013

Hydrological Processes

104

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The fresh groundwater lenses (FGLs) of small islands can be highly vulnerable to climate change impacts, including sea-level rise (SLR). Many real cases of atoll or sandy islands involve two-layer hydrogeological conceptualizations. In this paper, the influential factors that affect FGLs in two-layer small islands subject to SLR are investigated. An analytical solution describing FGLs in circular islands, composed of two geological layers, is developed for the simplified case of steady-state and sharp-interface conditions. An application of the developed model is demonstrated to estimate the FGL thickness of some real-world islands by comparison with existing FGL thickness data. Furthermore, numerical modelling is applied to extend the analysis to consider dispersion effects and to confirm comparable results for both cases. Sensitivity analyses are used to assess the importance of landsurface inundation caused by SLR, relative to other parameters (i.e. thickness of aquifer layers, hydraulic conductivity, recharge rate and land-surface slope) that influence the FGL. Dimensionless parameters are used to generalize the findings. The results demonstrate that land-surface inundation has a considerable impact on a FGL influenced by SLR, as expected, although the FGL volume is more sensitive to recharge, aquifer thickness and hydraulic conductivity than SLR impacts, considering typical parameter ranges. The methodology presented in this study provides water resource managers with a rapid-assessment tool for evaluating the likely impacts of SLR and accompanying LSI on FGLs.

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Groundwater travel times for unconfined island aquifers bounded by freshwater or seawater

Cited by 31 publications

References 13 publications

Groundwater ages, recharge conditions and hydrochemical evolution of a barrier island freshwater lens (Spiekeroog, Northern Germany)

Groundwater ages, recharge conditions and hydrochemical evolution of a barrier island freshwater lens (Spiekeroog, Northern Germany)

Groundwater travel time in the freshwater lenses of Samborombón Bay, Argentina

Sea‐level rise impact on fresh groundwater lenses in two‐layer small islands

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