Experimental and numerical investigation on seawater intrusion into unconfined coastal aquifers under instantaneous head changes at the boundaries

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Mehdizadeh SEYED SADJAD; Dini Amir Mohsen; Ghoroqi Milad

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Journal: JOURNAL OF HYDRAULICS Year:2019 | Volume:14 | Issue:2 (142) Page(s): 129-143

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Title

Experimental and numerical investigation on seawater intrusion into unconfined coastal aquifers under instantaneous head changes at the boundaries

Author(s)

Mehdizadeh SEYED SADJAD | Dini Amir Mohsen | Ghoroqi Milad | Issue Writer Certificate

Keywords

Seawater intrusionQ1

Head changeQ1

Coastal aquiferQ2

Laboratory modelQ2

Numerical modelQ2

Sea and land boundariesQ1

Abstract

Sea level rise and groundwater extrapolation lead to freshwater Head changes at the boundaries of the Coastal aquifers and causes further intrusion of seawater into the aquifers. In the present study, the behavior of unconfined Coastal aquifer to instantaneous sea level rise and freshwater head decline is investigated by physical and mathematical dispersive modellings. Three Laboratory models have been conducted in a sand tank and salt wedge shape has been photographed over time. Salt wedge toe position, area of transition zone and volume of intruded seawater are measured for this purpose. The numerical results are in a good agreement with the experimental observations. The outputs derived by both modellings indicate that the instantaneous rise of head in sea boundary or significant decline of freshwater head in land-side deforms the wedge shape of saline water, so that the seawater encroachment velocity at its tip will be faster than other regions. Moreover, establishment of an inverse hydraulic gradient (hydraulic gradient from sea to land) causes significant seawater delivery from sea into the aquifer. As a result, the salt wedge can even be stretched up to land boundary. Results of dispersive simulations demonstrate that when the velocity of saline water rises inside the aquifer, the advection role will be highlighted rather than dispersion. However, the longitudinal and transverse dispersivity will also increase which consequently will widen the transition zone. Nevertheless, the increase rate of saline water volume has been achieved much higher than the growth rate of toe position and transition zone area.

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APA: Copy

Mehdizadeh, SEYED SADJAD, Dini, Amir Mohsen, & Ghoroqi, Milad. (2019). Experimental and numerical investigation on seawater intrusion into unconfined coastal aquifers under instantaneous head changes at the boundaries. JOURNAL OF HYDRAULICS, 14(2 (142) ), 129-143. SID. https://sid.ir/paper/124174/en

Vancouver: Copy

Mehdizadeh SEYED SADJAD, Dini Amir Mohsen, Ghoroqi Milad. Experimental and numerical investigation on seawater intrusion into unconfined coastal aquifers under instantaneous head changes at the boundaries. JOURNAL OF HYDRAULICS[Internet]. 2019;14(2 (142) ):129-143. Available from: https://sid.ir/paper/124174/en

IEEE: Copy

SEYED SADJAD Mehdizadeh, Amir Mohsen Dini, and Milad Ghoroqi, “Experimental and numerical investigation on seawater intrusion into unconfined coastal aquifers under instantaneous head changes at the boundaries,” JOURNAL OF HYDRAULICS, vol. 14, no. 2 (142) , pp. 129–143, 2019, [Online]. Available: https://sid.ir/paper/124174/en

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