Saltwater upconing zone of influence

Jakovovic, Danica; Werner, Adrian D.; Louw, P. G. B. de; Post, Vincent; Morgan, Leanne K.

doi:10.1016/j.advwatres.2016.05.003

Cited by 40 publications

(22 citation statements)

References 26 publications

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“…Few researches recently simulated the upconing phenomena based on field data (LlopisAlbert and Pulido-Velazquez 2014Mehdizadeh et al 2015;Strack et al 2016;De Filippis et al 2016;Jakovovic et al 2016). It could be concluded from these studies that the applicability of the sharp-interface approach in field-scale strongly depends on well location and pumping rate.…”

Section: Introductionmentioning

confidence: 99%

Transient Investigation of the Critical Abstraction Rates in Coastal Aquifers: Numerical and Experimental Study

Abdelgawad

Abdoulhalik

Ahmed

et al. 2018

Water Resour Manage

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This research investigated the transient saltwater upconing in response to pumping from a well in a laboratory-scale coastal aquifer. Laboratory experiments were completed in a 2D flow tank for a homogeneous aquifer where the time evolution of the saltwater wedge was analysed during the upconing and the receding phase. The SEAWAT code was used for validation purposes and to thereafter examine the sensitivity of the critical pumping rate and the critical time (the time needed for the saltwater to reach the well) to the well design and hydrogeological parameters. Results showed that the critical pumping rate and the critical time were more sensitive to the variations of the well location than the well depth. The critical time increased with increasing the location and depth ratios following a relatively linear equation. For all the configurations tested, the lowest critical pumping rate was found for the lower hydraulic conductivity, which reflects the vulnerability of low permeability aquifers to salinization of pumping wells. In addition, higher saltwater densities led to smaller critical pumping rate and shorter critical time. The influence of the saltwater density on the critical time was more significant for wells located farther away from the initial position of the interface. Moreover, increasing the dispersivity induced negligible effects on the critical pumping rate, but reduced the critical time for a fixed pumping rate.

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Section: Introductionmentioning

confidence: 99%

Transient Investigation of the Critical Abstraction Rates in Coastal Aquifers: Numerical and Experimental Study

Abdelgawad

Abdoulhalik

Ahmed

et al. 2018

Water Resour Manage

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“…These analytical studies all assume a sharp boundary between fresh and salt groundwater, which generally results in optimistic estimates of the effects of pumping on salinization. If hydrodynamic dispersion is taken into account, a brackish transition zone will develop that has a larger area of influence of brackish upconing then a sharp interface (Reilly and Goodman 1987, Zhou et al 2005, Jakovovic et al 2016 and creates a gradual increase in concentrations of pumped groundwater Goodman 1987, Werner et al 2009). Also, the development of a brackish transition zone makes the decay of salinity after pumping has stopped much slower.…”

Section: Groundwater Salinizationmentioning

confidence: 99%

Non-renewable groundwater use and groundwater depletion: a review

Bierkens

Wada

2019

Environ. Res. Lett.

356

191

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Population growth, economic development, and dietary changes have drastically increased the demand for food and water. The resulting expansion of irrigated agriculture into semi-arid areas with limited precipitation and surface water has greatly increased the dependence of irrigated crops on groundwater withdrawal. Also, the increasing number of people living in mega-cities without access to clean surface water or piped drinking water has drastically increased urban groundwater use. The result of these trends has been the steady increase of the use of non-renewable groundwater resources and associated high rates of aquifer depletion around the globe. We present a comprehensive review of the state-ofthe-art in research on non-renewable groundwater use and groundwater depletion. We start with a section defining the concepts of non-renewable groundwater, fossil groundwater and groundwater depletion and place these concepts in a hydrogeological perspective. We pay particular attention to the interaction between groundwater withdrawal, recharge and surface water which is critical to understanding sustainable groundwater withdrawal. We provide an overview of methods that have been used to estimate groundwater depletion, followed by an extensive review of global and regional depletion estimates, the adverse impacts of groundwater depletion and the hydroeconomics of groundwater use. We end this review with an outlook for future research based on main research gaps and challenges identified. This review shows that both the estimates of current depletion rates and the future availability of non-renewable groundwater are highly uncertain and that considerable data and research challenges need to be overcome if we hope to reduce this uncertainty in the near future.

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“…Note also that λ > 5 in our model, being the largest cell size within a 200 m wide region along the coast. A model satisfying this condition has the benefit of (a) yielding a proper reconstruction of the spatial correlation structure of Y and (b) limiting the occurrence of excessive variations between values of aquifer properties across neigh-boring cells (Kerrou and Renard, 2010) in the region where SWI takes place.…”

Section: Parametermentioning

confidence: 99%

“…Abarca et al (2007) introduced a modified Henry problem to account for dispersive solute transport and anisotropy in hydraulic conductivity. Kerrou and Renard (2010) analyzed the dispersive Henry problem within two-and three-dimensional randomly heterogeneous aquifer systems. These authors relied on computational analyses performed on a single threedimensional realization, invoking ergodicity assumptions.…”

Section: Introductionmentioning

confidence: 99%

Groundwater withdrawal in randomly heterogeneous coastal aquifers

Siena

Riva

2018

Hydrol. Earth Syst. Sci.

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Abstract. We analyze the combined effects of aquifer heterogeneity and pumping operations on seawater intrusion (SWI), a phenomenon which is threatening coastal aquifers worldwide. Our investigation is set within a probabilistic framework and relies on a numerical Monte Carlo approach targeting transient variable-density flow and solute transport in a three-dimensional randomly heterogeneous porous domain. The geological setting is patterned after the Argentona river basin, in the Maresme region of Catalonia (Spain). Our numerical study is concerned with exploring the effects of (a) random heterogeneity of the domain on SWI in combination with (b) a variety of groundwater withdrawal schemes. The latter have been designed by varying the screen location along the vertical direction and the distance of the wellbore from the coastline and from the location of the freshwater–saltwater mixing zone which is in place prior to pumping. For each random realization of the aquifer permeability field and for each pumping scheme, a quantitative depiction of SWI phenomena is inferred from an original set of metrics characterizing (a) the inland penetration of the saltwater wedge and (b) the width of the mixing zone across the whole three-dimensional system. Our results indicate that the stochastic nature of the system heterogeneity significantly affects the statistical description of the main features of the seawater wedge either in the presence or in the absence of pumping, yielding a general reduction of toe penetration and an increase of the width of the mixing zone. Simultaneous extraction of fresh and saltwater from two screens along the same wellbore located, prior to pumping, within the freshwater–saltwater mixing zone is effective in limiting SWI in the context of groundwater resources exploitation.

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Saltwater upconing zone of influence

Cited by 40 publications

References 26 publications

Transient Investigation of the Critical Abstraction Rates in Coastal Aquifers: Numerical and Experimental Study

Transient Investigation of the Critical Abstraction Rates in Coastal Aquifers: Numerical and Experimental Study

Non-renewable groundwater use and groundwater depletion: a review

Groundwater withdrawal in randomly heterogeneous coastal aquifers

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