Assessment of seawater intrusion in an arid coastal aquifer, south-eastern Tunisia, using multivariate statistical analysis and chloride mass balance

Telahigue, Faten; Agoubi, Belgaçem; Souid, Faiza; Kharroubi, Adel

doi:10.1016/j.pce.2018.05.001

Cited by 36 publications

(10 citation statements)

References 22 publications

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“…Seawater salinity is not uniformly distributed throughout the world, whereas, the majority of seawater has a salinity of between 31 g/kg and 38 g/kg [29]. The most dominant dissolved ions in seawater are sodium, chloride, magnesium, sulphate, and calcium [30]. The compositions of the total salt component are: Cl − 55%, Na + 30.6%, 4 −2 7.7%, Mg 2+ 3.7%, Ca 2+ 1.2%, K + 1.1%, other 0.7% [31].…”

Section: Methods and Setting Experimentsmentioning

confidence: 99%

Evidence of Improved Seawater Quality using a Slow Sand Filtration

Abushandi¹

2021

Adv. sci. technol. eng. syst. j.

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In recent years water treatment methods under pressurized systems have been considered as the optimum high-rate filtration techniques. Unpressurized-slow sand filtration can be the cheapest and most efficient method, among others. This research aims to test the performance of a reliable seawater filtration system, using three different iterations. The filters have been designed considering many types of filtration layers such as sand, gravel, palm chlorophyll and other layers. The results of routine tests showed that the seawater pH, and TSS, and conductivity in the Gulf of Oman are relatively high. The pH values were decreased from 9.4 to 8.4 (filter 1), 9.0 (filter 2), and 8.7 (filter 3). Filter three has a reduced value of conductivity from 13.06 to 12.81 Ms/cm while a slight increase in filters 1 and 2. The TSS values were significantly reduced from 12.42 mg/L to 1.682 mg/L (filter 1), 2.478 mg/L (filter 2), and 1.200 mg/L (filter 3). This reflects the efficiency for each filter for this parameter is 86.5% for filter 1, 80% for filter 2, while 90.3% for filter three. Water velocity through each layer was monitored using Darcy law where the water of filter three has the longest residence time and slowest flow per time. The fastest flow was in filter one with an average of 0.5 L/minutes, filter two has an average flow of 0.088 L/minutes, while filter 3 has a flow rate of 0.026 L/minutes. The third filter has provided the best performance according to the results. Statistical analysis was conducted to understand the correlation between different parameters. As per Pearson correlation, there is a significant correlation between pH and conductivity values for 19 samples (0.989), while the correlation with TSS is relatively weak (0.364).

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Section: Methods and Setting Experimentsmentioning

confidence: 99%

Evidence of Improved Seawater Quality using a Slow Sand Filtration

Abushandi¹

2021

Adv. sci. technol. eng. syst. j.

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“…A widely applied approach to evaluate GW salinization, is surely the one that employed geostatistical methodologies such as multivariate statistical analysis [118][119][120][121][122][123][124][125][126]. In a recent study, Slama and Bouhlila have strengthened this approach by adding hydrogeochemical modelling to further constrain seawater-freshwater mixing [127].…”

Section: Data Handling Techniquesmentioning

confidence: 99%

The Issue of Groundwater Salinization in Coastal Areas of the Mediterranean Region: A Review

Mastrocicco

Colombani

2021

Water

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The Mediterranean area is undergoing intensive demographic, social, cultural, economic, and environmental changes. This generates multiple environmental pressures such as increased demand for water resources, generation of pollution related to wastewater discharge, and land consumption. In the Mediterranean area, recent climate change studies forecast large impacts on the hydrologic cycle. Thus, in the next years, surface and ground-water resources will be gradually more stressed, especially in coastal areas. In this review paper, the historical and geographical distribution of peer-review studies and the main mechanisms that promote aquifer salinization in the Mediterranean area are critically discussed, providing the state of the art on topics such as actual saltwater wedge characterization, paleo-salinities in coastal areas, water-rock interactions, geophysical techniques aimed at delineating the areal and vertical extent of saltwater intrusion, management of groundwater overexploitation using numerical models and GIS mapping techniques for aquifer vulnerability to salinization. Each of the above-mentioned approaches has potential advantages and drawbacks; thus, the best tactic to tackle coastal aquifer management is to employ a combination of approaches. Finally, the number of studies focusing on predictions of climate change effects on coastal aquifers are growing but are still very limited and surely need further research.

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“…Researchers have employed multivariate statistical analysis of physical and chemical GW data to evaluate the effect of SWI on coastal aquifers [ 20 , 22 , 23 ]. Principal component analysis (PCA) and factor analysis are the most used multivariate statistical techniques in SWI studies [ 19 , 24 , 25 ]. Telahigue et al [ 25 ] utilized PCA as a multivariate statistical technique to identify the main hydrochemical processes affecting the GW chemistry and quality in the southeastern region of Tunisia.…”

Section: Introductionmentioning

confidence: 99%

“…Principal component analysis (PCA) and factor analysis are the most used multivariate statistical techniques in SWI studies [ 19 , 24 , 25 ]. Telahigue et al [ 25 ] utilized PCA as a multivariate statistical technique to identify the main hydrochemical processes affecting the GW chemistry and quality in the southeastern region of Tunisia. Sae-Ju et al [ 19 ] implemented a PCA with hydrochemical facies evolution (HFE) diagram to understand the freshening and intrusion processes in a coastal aquifer in Thailand.…”

Section: Introductionmentioning

confidence: 99%

Integrated clustering analysis for delineating seawater intrusion and heavy metals in Arabian Gulf Coastal groundwater of Saudi Arabia

Benaafi,

Abba,

Tawabini

et al. 2023

Heliyon

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Assessment of seawater intrusion in an arid coastal aquifer, south-eastern Tunisia, using multivariate statistical analysis and chloride mass balance

Cited by 36 publications

References 22 publications

Evidence of Improved Seawater Quality using a Slow Sand Filtration

Evidence of Improved Seawater Quality using a Slow Sand Filtration

The Issue of Groundwater Salinization in Coastal Areas of the Mediterranean Region: A Review

Integrated clustering analysis for delineating seawater intrusion and heavy metals in Arabian Gulf Coastal groundwater of Saudi Arabia

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