Assessment of sharp-interface approach for saltwater intrusion prediction in an unconfined coastal aquifer exposed to pumping

Mehdizadeh, S. Sadjad; Vafaie, Freydoon; Abolghasemi, Hosein

doi:10.1007/s12665-014-3996-9

Cited by 28 publications

(17 citation statements)

References 33 publications

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“…Mehdizadeh et al 2015;Noorabadi et al 2017). In most of the previous upconing laboratory studies, the variation of salt concentration within the freshwater-saltwater transition zone during the upconing was not explored mostly because measurements were only through visual observations.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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%

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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“…The sharp interface approach is applicable considering the pumping rate. Based on [19] the sharp interface is more compatible to the realistic case when the pumping rate is higher than 0.07 m 3 per day and up to 0.15 m 3 per day also when the wells are relatively deep. This is the case in the lower Tripoli aquifer where the wells are deep (about 100 m) and the pumping rate is about 33,600 m 3 per day justifying the application of the sharp interface approximation.…”

Section: Mathematical Formulationmentioning

confidence: 80%

“…This approximation need to be carefully verified before application. Its validity has been discussed in [18,19]. This approach has been used by [20] in Batinah aquifer of Oman, where explicit expressions for the water table, sharp interface location and stored volume of fresh water are obtained.…”

Section: Introductionmentioning

confidence: 99%

Impact of Demographic Growth on Seawater Intrusion: Case of the Tripoli Aquifer, Lebanon

Kalaoun

Bitar

Gastellu-Etchegorry

et al. 2016

Water

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Water resources in Mediterranean coastal aquifers are subject to overexploitation leading to an increase in seawater intrusion. Based on the United Nations Environment Program, "UNEP" 75% of people in the world will live in coastal cities by 2020. This is having a major impact on the salinization process. This paper deals with the impact of demographic evolution on seawater intrusion and considers the case of the lower Tripoli aquifer in Lebanon. A numerical model based on the sharp interface approach is implemented using "Freefem++" to access the seawater intrusion. The model is verified against an analytic and a numerical solution. It is calibrated and validated against hydraulic head observations (RMSD = 0.819 m). Then several scenarios of pumping are applied based on available demographic growth rates to quantify the impact on seawater intrusion. The projection scenarios show that if the current pumping rates are maintained while maintaining the demographic evolution, the pumping wells will be salinized within 2 decades in the highly populated areas.

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“…The results show that the groundwater level fluctuates with a periodicity similar to tide periodicity, and the fresh saline water interface itself fluctuates due to sea level oscillations. However, the dynamic behavior of groundwater flow in a coastal aquifer is complex when considering the effect of groundwater exploitation [12,16,[40][41][42]. Due to overpumping groundwater in coastal areas, the depression cones of the groundwater level can exacerbate seawater intrusion by reducing the hydraulic pressure of the freshwater.…”

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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Assessment of sharp-interface approach for saltwater intrusion prediction in an unconfined coastal aquifer exposed to pumping

Cited by 28 publications

References 33 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

Impact of Demographic Growth on Seawater Intrusion: Case of the Tripoli Aquifer, Lebanon

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

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