The SIVI index: a comprehensive approach for investigating seawater intrusion vulnerability for island and coastal aquifers

Zeynolabedin, Amin; Ghiassi, Reza

doi:10.1007/s12665-019-8651-z

Cited by 8 publications

(13 citation statements)

References 17 publications

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“…e tool also helps to analyze the vulnerability to seawater intrusion at aquifer scale. In the literature, we find different methods to assess groundwater vulnerability depending on the drivers of pollution (Aller et al, Vias et al, and Baena-Ruiz and Pulido-Velazquez [40][41][42]), pumping (Pulido-Velazquez et al [43,44]), and SWI [12,16]. Userfriendly tools have appeared to assist in this assessment; some of them were developed in a GIS environment [45].…”

Section: Discussionmentioning

confidence: 99%

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GIS-SWIAS: Tool to Summarize Seawater Intrusion Status and Vulnerability at Aquifer Scale

Baena-Ruíz

Pulido-Velázquez

2021

Scientific Programming

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In this paper, we introduce GIS-SWIAS, a novel generalized ArcGIS ArcToolbox that helps to analyze seawater intrusion (SWI) status and vulnerability at aquifer scale (SWIAS). It is a user-friendly tool that can be applied to any aquifer and is fully integrated in the ArcGIS environment, which is a widely available software tool. It is the first ArcGIS tool with these characteristics focusing on SWI analyses that we can find in the literature. GIS-SWIAS is able to deal with georeferenced information; it is easy to introduce the required data (inputs) and to efficiently perform the demanding computational operations required. Its outputs are in the form of shapes, reports, and images (maps, conceptual cross sections, and time series of lumped indices) to summarize the magnitude, intensity, and temporal evolution of SWI within an aquifer for specific dates or by showing statistics for a chosen time period. It can be applied to assess historical SWI dynamic in cases where there is no groundwater flow model. In those cases, the spatial distribution is assessed by applying simple interpolation techniques. Nevertheless, if we want a rational quantitative analysis of the sustainability of alternative management scenarios to the SWI problem, the GIS-SWIAS tool requires that information on hydraulic head and chloride concentration distribution is generated from simulations of their impacts by a calibrated density-dependent flow model. In such cases, adaptation strategies to potential future scenarios—whose distributed impacts have to be propagated within the previously calibrated models—could usefully be analyzed and compared using this tool. Given all these ways that the GIS-SWIAS tool can be applied, it provides a valuable tool for both the researcher and technician to assess SWI dynamics and aquifer resilience under different scenarios. It can support the decision-making process by helping to make a rational selection of sustainable management strategies. Its performance for the analyses of historical and potential future scenarios has been tested and confirmed in two case studies described in previous research works.

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Section: Discussionmentioning

confidence: 99%

“…Based on the salinity or chloride concentration maps at different dates, some authors have defined indices to summarize SWI [9][10][11][12]. ese indices provide an overview of the intensity and spatial distribution or percentage SWI at aquifer scale.…”

Section: Introductionmentioning

confidence: 99%

GIS-SWIAS: Tool to Summarize Seawater Intrusion Status and Vulnerability at Aquifer Scale

Baena-Ruíz

Pulido-Velázquez

2021

Scientific Programming

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“…Two well-known indices are called GALDIT and SITE, which would serve as the foundation for the creation of the seawater intrusion vulnerability index (SIVI), a new index designed to address some of these deficiencies [9]. Each of these two indices has benefits and drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Groundwater Vulnerability to Seawater Intrusion Using GALDIT, SITE and SIVI Methods in Laspias River Coastal Aquifer System, NE Greece

Pliaka,

Gkiougkis,

Karasogiannidis

et al. 2024

Water

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This paper presents the investigation of groundwater vulnerability to seawater intrusion of the aquifer system in the coastal area of Laspias River, NE Greece, for the year 2023, by applying the GALDIT, SITE and SIVI methods, in the context of the groundwater management of the area. The relevant research works include the collection and analysis of data and information regarding the geological and geomorphological environment, as well as the hydrogeological system of the area. The calculation of the GALDIT, SITE and SIVI indices values is described, and the results from the application of the methods are presented, as well as the design of relevant groundwater vulnerability maps of the study area. This paper concludes with findings and proposals useful for the reliable assessment of the hydrogeological regime of the wider study area.

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“…Thus, freshwater aquifers have significant value to those cities particularly in drought-prone areas. A major threat to water supply from coastal aquifers is seawater intrusion (SWI) [1][2][3][4]. Under normal circumstances, the seawater level will have a lower elevation than the groundwater (GW) table, thereby allowing seaward GW flow.…”

Section: Introductionmentioning

confidence: 99%

“…Under normal circumstances, the seawater level will have a lower elevation than the groundwater (GW) table, thereby allowing seaward GW flow. In the face of GW overexploitation or rising sea levels, this flow direction may change, rendering coastal aquifers vulnerable to salinization [1,3,[5][6][7]. GW salinization has a negative impact on fresh water supply, environmental health, coastal infrastructure, and tourism.…”

Section: Introductionmentioning

confidence: 99%

Vulnerability of a Tunisian Coastal Aquifer to Seawater Intrusion: Insights from the GALDIT Model

Zghibi

Merzougui

Mansaray

et al. 2022

Water

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The Korba region in northwestern Tunisia has a coastal aquifer that is impacted by intensive irrigation, urban expansion, and sensitivity to SWI. We assessed the vulnerability extent of Korba’s GW to SWI. We utilized a parametric model for GW vulnerability assessment, the GALDIT, which considers six parameters to determine SWI effects. The GALDIT map has four rating categories (≥7.5, 7.5–5, 5–2.5, and <2.5), representing very high, high, moderate, and low vulnerability, respectively. Most of the region was found to be highly vulnerable (44.2% of the surface area), followed by areas characterized by very high (20.3%) and moderate (19.3%) vulnerability. Only 16.2% was found to have low vulnerability. A parameter sensitivity analysis showed that distance from shore and depth of GW represent the determining factors for SWI with variation index values of 24.12 and 18.02%, respectively. Inland advancement of seawater is causing GW salinity to rise, as indicated by a strong Pearson correlation coefficient of 0.75 between SWI indices and the electrical conductivity. Suitable areas for artificial recharge were mainly distributed in the alluvial plains, with a total area of 32.85 km2. Inhibiting SWI requires about 11.31 MCM of artificial recharge in the two most suitable recharge zones in the region.

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The SIVI index: a comprehensive approach for investigating seawater intrusion vulnerability for island and coastal aquifers

Cited by 8 publications

References 17 publications

GIS-SWIAS: Tool to Summarize Seawater Intrusion Status and Vulnerability at Aquifer Scale

GIS-SWIAS: Tool to Summarize Seawater Intrusion Status and Vulnerability at Aquifer Scale

Assessment of Groundwater Vulnerability to Seawater Intrusion Using GALDIT, SITE and SIVI Methods in Laspias River Coastal Aquifer System, NE Greece

Vulnerability of a Tunisian Coastal Aquifer to Seawater Intrusion: Insights from the GALDIT Model

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