Numerical Investigation of Seawater Intrusion and Retreat in Coastal Aquifers

Document Type : Research Article

Authors

1 Ph.D. Student, Department of Civil engineering, Shahrood University of Technology

2 Associate Professor, Department of Civil engineering, Shahrood University of Technology

Abstract

Seawater intrusion is a transient process, but the transient behavior of this phenomenon has received less attention due to human limitations to acquire numerical and experimental results. The influence of decreasing and increasing of the freshwater head on the saltwater wedge and the mixing zone movement was simulated using SUTRA code. To acquire and analysis simulated resulting, automated algorithm was planned in MATLAB. In order to more study the saltwater movement, changes in the three indicators of wedge toe length, wedge area and wedge height were measured over the time. The results demonstrated that the wedge area behavior is similar to the wedge toe length under transient condition. In the case of seawater intrusion, the wedge height reaches the steady state conditions sooner than the two other indicators, while in the retreating case, all the three indicators are stopped almost together. Also, the results showed that the mixing zone expanded at the primary stages of the retreating, but whit passage of time condensed again until it finally reaches its original state at the beginning of the intruding case. Sensitivity analyzes demonstrated that the rate of seawater intrusion and retreat does not affect the mixing zone thickness in the steady condition.

Keywords

Main Subjects

References

[1].Chang S.W, Clement T.P, Simpson M.J, Lee K.K. Does sea-level rise have an impact on saltwater intrusion? Advances in Water Resources. 2011; 34:1283–91. http://dx.doi.org/ 10.1016/j.advwatres.2011.06.006
[2]. Chang S.W, Clement, T. P., Experimental and numerical investigation of saltwater intrusion dynamics in flux-controlled groundwater systems. 2012. 48(March), 1–10. https://doi.org/10.1029/2012WR012134
[3]. Bear J, Cheng A.H.D. Modeling Groundwater Flow and Contaminant Transport. Volume 23. Library of Congress Control Number: 2009938711. Springer Science+Business Media B.V. 2010
[4]. Werner A. D, Bakker M, Post V. E. A, Vandenbohede A, Lu C, Ataie-Ashtiani B, Simmons C.T, Barty D.A. Seawater intrusion processes, investigation and management: Recent advances and future challenges. Advances in Water Resources. 2013. 51, 3–26. https://doi.org/10.1016/j.advwatres.
 
[5]. Abarca E, Clement T.P. A novel approach for characterizing the mixing zone of a saltwater wedge. Geophysical Research Letters. 2009.36(6), 1–5. https://doi.org/10.1029/2008GL036995
[6]. Bear J. Dynamics of fluids in porous media. Amsterdam: Elsevier; 1972.
[7]. Bruggeman GA. Analytical solutions of geohydrological problems. Developments in water science, vol. 46. Amsterdam: Elsevier; 1999.
[8]. Strack ODL. A single-potential solution for regional interface problems in coastal aquifers. Water Resour Res 1976;12:1165–74.
[9]. Dagan G, Zeitoun D.G. Seawater–freshwater interface in a stratified aquifer of random permeability distribution. J Contam Hydrol 1998;29:185–203.
[10]. Bakker M. Transient Dupuit interface flow with partially penetrating features.Water Resour Res 1998;34:2911–8.
[11]. Bakker M. Analytic solutions for interface flow in combined confined and semi-confined, coastal aquifers. Adv Water Resour 2006;29:417–25.
[12]. Watson TA, Werner AD, Simmons CT. Transience of seawater intrusion in response to sea level rise. Water Resour Res 2010;46:W12533. http://dx.doi.org/10.1029/2010WR00956
[13]. Mehdizadeh S.S, Werner A. D, Vafaie F, Badaruddin S. Vertical leakage in sharp-interface seawater intrusion models of layered coastal aquifers. Journal of Hydrology;2014. https://doi.org/10.1016/j.jhydrol.2014.08.027
[14]. Abarca E, Carrera J, Sánchez-Vila X, Dentz M. Anisotropic dispersive Henry problem. Advances in Water Resources; 2007.30(4), 913–926. https://doi.org/10.1016/j.advwatres.2006.08.005
[15]. Simpson MJ, Clement TP. Improving the worthiness of the Henry problem as a benchmark for density-dependent groundwater flow models. Water Resour Res 2004;40:W01504. http://dx.doi.org/10.1029/2003WR00219
[16]. Held R, Attinger S, Kinzelbach W. Homogenization and effective parameters for the Henry problem in heterogeneous formations. Water Resour Res 2005;41:1–14.
[17]. Paster A, Dagan G. Mixing at the interface between two fluids in porous media: a boundary-layer solution. J Fluid Mech 2007;584:455–72.
[18]. Werner AD, Simmons CT. Impact of sea-level rise on seawater intrusion in coastal aquifers. Ground Water 2009;47:197–204.
[19]. Ataie-Ashtiani B, Werner A.D, Simmons C.T, Morgan L.K, Lu C. How important is the impact of land-surface inundation on seawater intrusion caused by sea-level rise?. Hydrogeology Journal. 2013; 21: 1673–1677. DOI 10.1007/s10040-013-1021-0
[20]. Carretero S, Rapaglia J, Bokuniewicz H, Kruse E. Impact of sea-level rise on saltwater intrusion length into the coastal aquifer, partido dela costa, Argentina. 2013. Cont. Shelf Res. 61–62, 62–70.
[21]. Hussain M.S, Javasi A.A. Assessing impacts of sea level rise on seawater intrusion in a coastal aquifer with sloped shoreline boundary. Journal of Hydro-environment Research. 2016; 11: 29–41
[22]. Morgan L.K, Stoeckl L, Werner A.D, Post V.E.A. An assessment of seawater intrusion overshoot using physical and numerical modeling. Water Resour. Res. 2013. 49 (10), 6522–6526
[23]. Morgan L.K, Bakker M, Werner A.D. Occurrence of seawater intrusion overshoot. Water Resour. Res. 2015: 51 (4), 1989–1999.
[24]. Ketabchi H, Mahmoodzadeh D, Ataie-Ashtiani B, Simmons C.T. Sea-level rise impacts on seawater intrusion in coastal aquifers: Review and integration. Journal of Hydrology.2016: 535; 235–255
[25]. Werner A.D. On the classification of seawater intrusion. Journal of Hydrology. 2017; http://dx.doi.org/10.1016/j.jhydrol.2016.12.012
[26]. Lu C, Werner A.D. Timescales of seawater intrusion and retreat. Advances in Water Resources. 2013; 59, 39–51. https://doi.org/10.1016/j.advwatres
[27]. Voss C, Provost,A. SUTRA—a Model for Saturated–unsaturated, Variabledensity Ground-water Flow with Solute or Energy Transport. US Geological Survey Water-Resources Investigations Report, 2010. 02-4231
[28]. Robinson G, Hamill G, Ahmed A.AAutomated image analysis for experimental investigations of salt water intrusion in coastal aquifers. J. Hydrol. 2015; 530. 350–360
Iranian journal of Ecohydrology
Volume 5, Issue 4
January 2019
Pages 1091-1102

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History

  • Receive Date: 20 February 2018
  • Revise Date: 11 March 2018
  • Accept Date: 21 April 2018
  • First Publish Date: 22 December 2018
  • Publish Date: 22 December 2018

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