Reduction of saltwater intrusion by modifying hydraulic conductivity

Strack, Otto D. L.; Stoeckl, Leonard; Damm, K. L. Von; Houben, Georg; Ausk, Bonnie; Lange, Willem de

doi:10.1002/2016wr019037

Cited by 58 publications

(37 citation statements)

References 24 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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“…Thus, theoretically, by artificially lowering the TCE in a coastal aquifer, SWI can be reduced. This explains the approach suggested by Strack et al () for reducing SWI by reducing the hydraulic conductivity in the upper part of the aquifer by using a precipitate, which essentially lowers the TCE.…”

Section: Theorymentioning

confidence: 71%

Defining the Effect of Stratification in Coastal Aquifers Using a New Parameter

Rathore

Zhao

et al. 2018

Water Resources Research

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This study, building on the comprehensive discharge potential theory presented by Strack and Ausk (2015) https://doi.org/10.1002/2015WR016887, discovered that the effects of layer arrangements on steady state seawater intrusion and groundwater discharge in stratified confined coastal aquifers can be approximated via transmissivity centroid elevation (TCE), defined as the summation of the product of the transmissivity and elevation (above the aquifer base) of each layer divided by the total aquifer transmissivity. Specifically, a higher TCE in aquifers with high transmissivity layers at high elevations results in a more landward interface‐toe position in both flux‐ and head‐controlled coastal aquifer systems, as well as a higher freshwater discharge rate in head‐controlled systems. Furthermore, the toe position in head‐controlled stratified systems is only a function of the TCE and independent of the total transmissivity. Therefore, we can estimate the upper limit of seawater intrusion, that is, the furthest inland toe position, in stratified aquifers by letting the TCE equal to the elevation of the aquifer top. Another important implication of our results is that the interface toe position in coastal aquifers containing a preferential flow layer is controlled by the elevation of the preferential flow layer. Additionally, effective parameters and homogenization of the interface flow in stratified aquifers were developed to approximate the toe position and discharge rate. The results developed in this study provide significant advances in understanding the effect of aquifer stratification on groundwater flow and seawater intrusion in coastal aquifers.

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“…As a consequence, the models may overestimate the actual penetration length of the seawater wedge [26]. Therefore, the analytical models of variable density flow including mixing between freshwater and seawater were provided considering the realistic condition [24,27]. However, the analytical solutions are often derived based on some hypothetical conditions.…”

Section: Introductionmentioning

confidence: 99%

Experiment and Numerical Simulation of Seawater Intrusion under the Influences of Tidal Fluctuation and Groundwater Exploitation in Coastal Multilayered Aquifers

et al. 2019

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The dynamic behavior of groundwater flow and salt transport is affected by tide and pumping in coastal multilayered aquifers. In this paper, two groups of experiments were conducted considering different constant head inland boundaries. The fluctuation of the groundwater level and the process of seawater intrusion in the multilayered aquifers were observed. A two-dimensional SEAWAT model is developed to simulate the seawater intrusion to coastal aquifers under the influences of tidal fluctuation and groundwater exploitation. The hydrogeological parameters in the model are calibrated by the records of the groundwater level and salinity measurements. The results showed that the simulated groundwater level and salt concentration match the observation well. The groundwater level has the characteristics of periodic fluctuation with tide. The lag time of the groundwater level fluctuation in each monitoring point increases slightly with the increasing distance from the saltwater chamber. For the low tide, the inland freshwater recharge has main effect on groundwater level fluctuation. The rising tide has a negative effect on the drawdown of the groundwater level induced by pumping. For the high tide, the tide plays a major role on groundwater level fluctuation, compared with the inland freshwater recharge. Compared with the condition of high head of inland recharge, larger saltwater intrusion lengths and area have been observed and simulated in the aquifer, which means that faster inland motion of the seawater wedge would occur when the inland recharge is small in the coastal aquifers. It revealed that inland recharge plays a major role in the seawater intrusion for the same pumping rate of groundwater in different seasons. The analysis provides insights into how the tide fluctuation, groundwater pumping, and inland recharge effect on the area and rates of seawater intrusion.

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Reduction of saltwater intrusion by modifying hydraulic conductivity

Cited by 58 publications

References 24 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

Defining the Effect of Stratification in Coastal Aquifers Using a New Parameter

Experiment and Numerical Simulation of Seawater Intrusion under the Influences of Tidal Fluctuation and Groundwater Exploitation in Coastal Multilayered Aquifers

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