Assessing impacts of sea level rise on seawater intrusion in a coastal aquifer with sloped shoreline boundary

Hussain, Mohammed S.

doi:10.1016/j.jher.2016.01.003

Cited by 35 publications

(16 citation statements)

References 29 publications

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“…So, the increase in permeability is responsible for the increase in the degree of movement of the iso-contours of the seawater wedge. Similar conclusion is achieved by Hussain and Javadi [42].…”

Section: Toe Position In Different Scenariossupporting

confidence: 89%

Numerical investigation on seawater intrusion and water leakage in different types of stratified coastal aquifers

et al. 2019

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Prediction of seawater intrusion (SWI) will increase the proper planning for withdrawal of groundwater, and it will help the freshwater management in the future. Since heterogeneous aquifers are more widespread than homogeneous one, this study aims to use the density-dependent SEAWAT code to investigate the influence of different combinations of hydraulic conductivity (K) on SWI. The effects of numbers and arrangement of layers with different K are examined on (a) toe position, (b) freshwater-seawater mixing zone thickness (W t) and (c) leakage from adjacent layers in a steady-state condition. For this purpose, numerous scenarios with different K were simulated and analyzed. The results of horizontally layered aquifers showed that the streamlines are broken on boundary of layers. It was observed that when K is decreased, especially at the middle layer, the refraction angle is increased and consequently W t is increased. The W t in vertically layered cases was less than horizontally layered aquifers because of less streamline breakage. Also, random arrangement of K directs the saline flow to higher permeability zones. Thus, the SWI extent in this type of aquifer was more tangible than other types. Because of the difference in hydraulic head at layer borders, the seepage rate significantly increases nearby toe position and the dominant direction is upward. However, in the steady-state condition, the type of flow did not differ significantly for boundary cells of layers at the vicinity of toe position.

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Section: Toe Position In Different Scenariossupporting

confidence: 89%

Numerical investigation on seawater intrusion and water leakage in different types of stratified coastal aquifers

et al. 2019

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“…It is often difficult to derive a clear understanding of the mechanisms affecting SWI directly from field-based investigation . The challenge of measuring and quantifying coastal aquifer hydrodynamics and SWI in field sites has promoted the use of laboratory and numerical modelling tools to gain a valuable insight into SWI response to various geological and/or hydrological stresses, such as (a) change in seaward freshwater discharge resulting from fluctuations at the inland head boundary (Abdoulhalik & Ahmed, 2017a; Abdoulhalik & Ahmed, 2017b; Abdoulhalik, Ahmed, & Hamill, 2017; Goswami & Clement, 2007;Robinson, Ahmed, & Hamill, 2016;Robinson, Hamill, & Ahmed, 2015) in head-controlled systems or from variations of the regional freshwater flux (Chang & Clement, 2012;Stoeckl & Houben, 2012;Stoeckl, Houben, & Dose, 2015) in flux-controlled systems and (b) SLR (Hussain & Javadi, 2016;Morgan, Bakker, & Werner, 2015;Morgan, Stoeckl, Werner, & Post, 2013). Goswami and Clement (2007) provided a thorough quantitative analysis of the steady state and transient toe response to freshwater head changes to provide an improved benchmark for numerical models.…”

Section: Introductionmentioning

confidence: 99%

“…The adverse impact of SLR on SWI has been well documented in the literature (Chang, Clement, Simpson, & Lee, 2011;Ketabchi et al, 2016;Ketabchi, Mahmoodzadeh, Ataie-Ashtiani, Werner, & Simmons, 2014;Michael, Russoniello, & Byron, 2013;Watson, Werner, & Simmons, 2010;Werner & Simmons, 2009). Hussain and Javadi (2016) showed that SLR significantly enhances the inland progression of saline water and caused a substantial reduction of the available fresh groundwater resources, particularly for flat-shoreline aquifer systems. The type of inland boundary condition was found to play a major role in determining the vulnerability of a coastal aquifer to SWI induced by SLR.…”

Section: Introductionmentioning

confidence: 99%

Transience of seawater intrusion and retreat in response to incremental water‐level variations

Abdoulhalik

Ahmed

2018

Hydrological Processes

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This paper provides for the first time an experimental study where the impact of sea‐level fluctuations and inland boundary head‐level variations on freshwater–saltwater interface toe motion and transition zone dynamics was quantitatively analysed under transient conditions. The experiments were conducted in a laboratory flow tank where various (inland and coastal) head changes were imposed to the system and the response of the key seawater intrusion parameters was analysed with high spatial and temporal resolution. Two homogeneous aquifer systems of different grain size were tested. The numerical code SEAWAT was used for the validation. The results show that in cases of sea‐level variations, the intruding wedge required up to twice longer time to reach a new steady‐state condition than the receding wedge, which thereby extend the theory of timescale asymmetry between saltwater intrusion and retreat processes in scenarios involving sea‐level fluctuations. The intruding and receding rates of the saltwater wedge were respectively similar in the scenario involving sea‐level and the freshwater‐level changes, despite change in transmissivity. The results show that, during the intrusion phase, the transition zone remains relatively insensitive, regardless of where the boundary head change occurs (i.e., freshwater drop or sea‐level rise) or its magnitude. By contrast, a substantial widening of the transition zone was observed during the receding phase, with almost similar amplitude in the scenario involving a rise of the freshwater level compared with that caused by a drop of the saltwater level, provided that an equivalent absolute head change magnitude was used. This transition zone widening (occurring during saltwater retreat) was greater and extended over longer period in the low hydraulic conductivity aquifer, for both freshwater‐level rise and sea‐level drop scenarios. The concentration maps revealed that the widening mechanism was also enhanced by the presence of some freshwater sliding and into the wedge during saltwater retreat, which was thereafter sucked upward towards the interface because of density difference effects.

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“…In autumn-winter, the intrusion front was landward biased, and in spring-summer season, it moved seawards. Hussain and Javadi (2016) showed that the extent of seawater intrusion in flat-bottomed sloped aquifers is greater than that in steepbottomed sloped aquifers. Furthermore, flat-bottomed sloped aquifers need shorter durations to reach steady state than steep-bottomed sloped aquifers.…”

Section: Salinization/seawater Intrusion Of Coastal Reservoirsmentioning

confidence: 99%

Desalinization and Salinization: A Review of Major Challenges for Coastal Reservoirs

Jin

et al. 2019

Journal of Coastal Research

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Assessing impacts of sea level rise on seawater intrusion in a coastal aquifer with sloped shoreline boundary

Cited by 35 publications

References 29 publications

Numerical investigation on seawater intrusion and water leakage in different types of stratified coastal aquifers

Numerical investigation on seawater intrusion and water leakage in different types of stratified coastal aquifers

Transience of seawater intrusion and retreat in response to incremental water‐level variations

Desalinization and Salinization: A Review of Major Challenges for Coastal Reservoirs

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