Laboratory investigation of water extraction effects on saltwater wedge displacement

Noorabadi, S.; Nazemi, A.H.; Sadraddini, A.A.; Delirhasannia, R.

doi:10.22034/gjesm.2017.03.01.003

Document Type : ORIGINAL RESEARCH ARTICLE

Authors

Department of Water Engineering, Faculty of agriculture, University of Tabriz, Tabriz, Iran

https://doi.org/10.22034/gjesm.2017.03.01.003

Abstract

There is a close connection between saltwater intrusion into aquifers and groundwater extraction. Freshwater extraction in coastal aquifers is one of the most important reasons for the saltwater intrusion into these aquifers. Condition of extraction system such as well depth, discharge rate, saltwater concentration and etc. could affect this process widely. Thus, investigating different extraction conditions comprises many management advantages. In the present study, the effects of freshwater extraction on saltwater interface displacement have been investigated in a laboratory box. Three different well depths (H) were considered with combinations of 3 different extraction rates (Q) and 3 saltwater concentrations (C) for detailed investigation of the effects of these factors variations on saltwater displacement. SEAWAT model has been used to simulate all the scenarios to numerically study of the process. The experimental and numerical results showed that when the C and Q rates were small and the well depth was shallow, the saltwater interface wouldn’t reach the extraction well, so the extracted water remained uncontaminated. When the C and Q rates were increased and the well was deepened, the salinity of the extracted water became higher. When the Q and C rates were high enough, in the shallow well depth, the final concentration of the extracted water was low but a huge part of the porous media was contaminated by the saltwater, furthermore when the well was deepened enough, the final concentration of the extracted water was increased but a small part of the porous media was contaminated by the saltwater. Finally, the results showed that when the Q and H rates were high enough, the extraction well behaved like a barrier and didn’t allow the advancing saltwater wedge toe to be intruded beyond the wells.

Graphical Abstract

Highlights

A laboratory model was a suitable method to the coastal aquifer study
The computer code, SEAWAT was a precise and reliable tool to investigate the salt movement in porous media
Seawater concentration and water extraction through a well and the depth of the extracted well were some important factors which have considerable effect on saltwater interface movement
The risk of salinization of the extracted water from a well was mainly depended on the extraction rate, well depth and saltwater concentration

Keywords

Main Subjects

Hydrology and water resources

References

Abarca, E.; Clement, T.P., (2009). A novel approach for characterizing the mixing zone of a saltwater wedge. Geophys. Res. Lett., 36(6): pp. L06402 (5 pages).

Abdollahi-Nasab, A.; Boufadel, M.C.; Li, H.; Weaver, J.W., (2010). Saltwater flushing by freshwater in a laboratory beach. J. Hydrol., 386 (1-4): 1-12 (12 pages).

Ataie-Ashtiani, B.; Ketabchi, H., (2011). Elitist continuous ant colony optimization algorithm for optimal management of coastal aquifers. Water Resour. Manage., 25(1): 165-190 (25 pages).

Chang, S.W.; Clement, T.P., (2012). Experimental and numerical investigation of saltwater intrusion dynamics in flux-controlled groundwater systems. Water Resour. Res., 48(9), W09527 (10 pages).

Chang, S.W.; Clement, T.P., (2013). Laboratory and numerical investigation of transport processes occurring above and within a saltwater wedge. J. Contam. Hydrol., 147(1): 14-24 (11 pages).

Cheng, A.H.D.; Halhal, D.; Naji, A.; Ouazar, D., (2000). Pumping optimization in saltwater-intruded coastal aquifers. Water Resour. Res., 36(8): 2155-2165 (11 pages).

Duarte, T.K.; Minciardi, R.; Robba, M.; Sacile, R., (2015). Optimal control of coastal aquifer pumping towards the sustainability of water supply and salinity. Sustainability Water Qual. Ecol., 6(1): 88-100 (13 pages).

Gorelick, S.M.; Zheng, C., (2015). Global change and the groundwater management challenge. Water Resour. Res., 51(1): 3031-3051 (21 pages).

Goswami, R.R.; Clement, T.P., (2007). Laboratory-scale investigation of saltwater intrusion dynamics. Water Resour. Res., 43(4), W04418 (11 pages).

Green, N.R.; MacQuarrie, K.T.B., (2014). An evaluation of the relative importance of the effects of climate change and groundwater extraction on seawater intrusion in coastal aquifers in Atlantic Canada. Hydrogeol. J., 22(3): 609-623 (25 pages).

Johannsen, K.; Kinzelbach, W.; Oswald, S.; Wittum, G., (2002). The salt-pool benchmark problem – numerical simulation of saltwater upconing in a porous medium. Adv. Water Resour., 25(3): 335-348 (14 pages).

Kalejaiye, B. O.; Cardoso, S.S.S., (2005). Specification of the dispersion coefficient in the modeling of gravity-driven flow in porous media. Water Resour. Res., 41(10), W10407 (11 pages).

Ketabchi, H.; Ataie-Ashtiani, B., (2015). Assessment of a parallel evolutionary optimization approach for efficient management of coastal aquifers. Environ. Model. Software, 74(1): 21-38 (18 pages).

Ketabchi, H.; Mahmoodzadeh, D.; Ataie-Ashtiani, B.; Simmons, C.T., (2016). Sea-level rise impact on seawater intrusion in coastal aquifers: Review and integration. J. Hydrol., 535(1): 235-255 (21 pages).

Konz, M.; Younes, A.; Ackerer, P.; Fahs, M.; Huggenberger, P. Zechner, E., (2009). Variable-density flow in heterogeneous porous media – Laboratory experiments and numerical simulations. J. Contam. Hydrol., 108 (3-4): 168-175 (8 pages).

Langevin, C. D.; Thorne, D.; Dausman, A. M.; Sukop, M. C.; Guo, W., (2008). SEAWAT Version 4: A Computer Program for Simulation of Multi- Species Solute and Heat Transport, USGS Tech. Methods, Book 6, chap. A22, U.S. Geol. Surv, Reston, Va.

Luyun, R.J.; Momii, K.; Nakagawa, K., (2009). Laboratory-scale saltwater behavior due to subsurface cutoff wall. J. Hydrol., 377(3-4): 227-236 (10 pages).

Mahesha, A.; Lakshmikant, P., (2014). Saltwater Intrusion in Coastal Aquifers Subjected to Freshwater Pumping. J. Hydrol. Eng., 19(2): 448-456 (9 pages).

Mantoglou, A., (2003). Pumping management of coastal aquifers using analytical models of saltwater intrusion. Water Resour. Res., 39(12), 1335 (12 pages).

Mantoglou, A.; Papantoniou, M., (2008). Optimal design of pumping networks in coastal aquifers using sharp interface models. J. Hydrol., 361(1-2): 52-63 (12 pages).

Morgan, L.K.; Stoeckle, L.; Werner, A.D.; Post, V.E.A., (2013). An assessment of seawater intrusion overshoot using physical and numerical modeling. Water Resour. Res., 49(1): 6522-6526 (5 pages).

Oostrom, M.; Hayworth, J.S.; Dane, J.H.; Guven, O., (1992). Behavior of dense aqueous phase leachate plumes in homogenous porous media. Water Resour. Res., 28(8): 2123– 2134 (12 pages).

Oswald, S.E.; Kinzelbach, W. (2004). Three-dimensional physical benchmark experiments to test variable-density flow models. J. Hydrol., 290(1-2): 22-42 (21 pages).

Park, C.H.; Aral, M.M., (2004). Multi-objective optimization of pumping rates and well placement in coastal aquifers. J. Hydrol., 290(1-2): 80–99 (20 pages).

Rasmussen, P.; Sonnenborg, T.O.; Goncear, G.; Hinsby, K., (2013). Assessing impacts of climate change, sea level rise, and drainage canals on saltwater intrusion to coastal aquifer. Hydrol. Earth Syst. Sci., 17(1): 421-443 (23 pages).

Schincariol, R.A.; Schwartz, F.W., (1990). An experimental investigation of variable density flow and mixing in homogeneous and heterogeneous media. Water Resour. Res., 26(10): 2317– 2329 (13 pages).

Shitu, A.; Izhar, S.; Tahir, T.M., (2015). Sub-critical water as a green solvent for production of valuable materials from agricultural waste biomass: A review of recent work. Global J. Environ. Sci. Manage., 1(3): 255-264 (10 pages).

Simmons, C.T.; Pierini, M.L.; Hutson, J.L., (2002). Laboratory Investigation of Variable-Density Flow and Solute Transport in Unsaturated–Saturated Porous Media. Transp. Porous Media, 47(2): 215-244 (30 pages).

Singh, A., (2014). Managing the environmental problem of seawater intrusion in costal aquifers through simulation-optimization modeling. Ecol. Indic., 48(1): 498-504 (7 pages).

Werner, A.D.; Bakker, M.; Post, V.E.A.; Vandenbohede, A.; Lu, C.; Ataie-Ashtiani, B.; Simmons, C.T.; Barry, D.A., (2013). Seawater intrusion processes, investigation and management: recent advances and future challenges. Adv. Water Resour., 51(1): 3-26 (24 pages).

Zhang, Q.; Volker, R.E.; Lockington, D.A., (2001). Influence of seaward boundary condition on contaminant transport in unconfined coastal aquifers. J. Contaminant Hydrol., 49 (3-4): 201-215 (5 pages).

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