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2021 Vol.26, Issue 6 Preview Page
Quantitative Assessment of Coastal Groundwater Vulnerability to Seawater Intrusion using Density-dependent Groundwater Flow Model

분산형 해수침투 모델을 이용한 양적 지표 기반의 해안지하수 취약성 평가연구

Sun Woo Chang1*
장선우 1*
1 Korea Institute of Civil Engineering and Building Technology, Gyeonggi-Do 10223, Korea
1 한국건설기술연구원
*Corresponding Author
31 December 2021. pp. 95-105
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Abstract

Extensive groundwater abstraction has been recognized as one of the major challenges in management of coastal groundwater. The purpose of this study was to assess potential changes of groundwater distribution of northeastern Jeju Island over 10-year duration, where brackish water have been actively developed. To quantitatively estimate the coastal groundwater resources, numerical simulations using three-dimensional finite-difference density-dependent flow models were performed to describe spatial distribution of the groundwater in the aquifer under various pumping and recharge scenarios. The simulation results showed different spatial distribution of freshwater, brackish, and saline groundwater at varying seawater concentration from 10 to 90%. Volumetric analysis was also performed using three-dimensional concentration distribution of groundwater to calculate the volume of fresh, brackish, and saline groundwater below sea level. Based on the volumetric analysis, a quantitative analysis of future seawater intrusion vulnerability was performed using the volume-based vulnerability index adopted from the existing analytical approaches. The result showed that decrease in recharge can exacerbate vulnerability of coastal groundwater resources by inducing broader saline area as well as increasing brackish water volume of unconfined aquifers.

Keywords
Seawater Intrusion (SWI)
Brackish groundwater
Future Scenarios
Volumetric analysis
SWI Vulnerability
Recharge
References

References

1

Chachadi, A.G. and Lobo-Ferreira, J.P, 2001, Sea water intrusion vulnerability mapping of aquifers using GALDIT method. Proc. Workshop on modelling in hydrogeology, Anna University, Chennai, pp.143-156, and in COASTIN A Coastal Policy Research Newsletter, Number 4, March 2001. New Delhi, TERI, 7-9.

2

Chang, S.W., Nemec, K., Kalin, L., and Clement, T.P., 2016, Impacts of climate change and urbanization on groundwater resources in a barrier island, J. Environ. Eng., 142(12), D4016001

10.1061/(ASCE)EE.1943-7870.0001123
3

Chang, S.W., Chung, I.-M., Kim, M.-G., Tolera, M., and Koh, G.-W., 2019, Application of GALDIT in Assessing the Seawater Intrusion Vulnerability of Jeju Island, South Korea, Water, 11, 1824.

10.3390/w11091824
4

Chang, S.W., Chung, I.-M., Kim, M.-G. and Yifru, B.A., 2020, Vulnerability assessment considering impact of future groundwater exploitation on coastal groundwater resources in northeastern Jeju Island, South Korea, Environ. Earth Sci., 79, 498, doi:10.1007/s12665-020-09254-2.

10.1007/s12665-020-09254-2
5

Chun, J.A., Lim, C., Kim, D., Kim, J.S., 2018, Assessing Impacts of Climate Change and Sea-Level Rise on Seawater Intrusion in a Coastal Aquifer, Water, 10(4), 357.

10.3390/w10040357
6

El-Kadi, A.I., Tillery, S., Whittier, R.B., Hagedorn, B., Mair, A., Ha, K., and Koh, G.-W., 2014, Assessing sustainability of groundwater resources on Jeju Island, South Korea, under climate change, drought, and increased usage, Hydrogeol. J., 22, 625-642, doi:10.1007/s10040-013-1084-y.

10.1007/s10040-013-1084-y
7

Fahs, M., Ataie-Ashtiani, B., Younes, A., Simmons, C.T., and Ackerer, P., 2016, The Henry problem: New semianalytical solution for velocity-dependent dispersion, Water Resour. Res., 52(9), 7382-7407, doi:10.1002/2016wr019288.

10.1002/2016WR019288
8

Giambastiani, B.M.S., Antonellini, M., Oude Essink, G.H.P., and Stuurman, R.J., 2007, Saltwater intrusion in the unconfined coastal aquifer of Ravenna (Italy): A numerical model, J. Hydrol., 340(1-2), 91-104.

10.1016/j.jhydrol.2007.04.001
9

Goswami, R.R. and Clement, T.P., 2007, Laboratory-scale investigation of saltwater intrusion dynamics, Water Resour. Res., 43(4), doi: 10.1029/2006WR005151.

10.1029/2006WR005151
10

Henry, H.R., 1964, Effects of dispersion on salt encroachment in coastal aquifers, U.S. Geological Survey Water-Supply Paper Rep. 1613-C, C71-C84. pp.

11

Guo, W. and Langevin, C.D., 2002, User's Guide to SEWAT: A Computer Program for Simulation of Three-Dimensional Variable-Density Ground-Water Flow, United States Geological Survey.

10.3133/twri06A7
12

Lee, E., Kang, K., Hyun, S.P., Lee, K.‐Y., Yoon, H., Kim, S.H., Kim, Y., Xu, Z., Kim, D., Koh, D. ‐C., and Ha, K., 2016, Submarine groundwater discharge revealed by aerial thermal infrared imagery: a case study on Jeju Island, Korea, Hydrol. Process, 30(19), 3494-3506. doi: 10.1002/hyp.10868.

10.1002/hyp.10868
13

Morgan, L.K. and Werner, A.D., 2015, A national inventory of seawater intrusion vulnerability for Australia, J. Hydrol., 4, 686-698, doi:https://doi.org/10.1016/j.ejrh.2015.10.005.

10.1016/j.ejrh.2015.10.005
14

Oude Essink, G.H.P., van Baaren, E.S., and de Louw, P.G.B., 2010, Effects of climate change on coastal groundwater systems: A modeling study in the Netherlands, Water Resour. Res., 46(10), W00F04, doi:10.1029/2009wr008719

10.1029/2009WR008719
15

Praveena, S.M. and Aris, A.Z., 2009, Groundwater resources assessment using numerical model: A case study in low-lying coastal area, Int. J. Environ. Sci. Technol., 7, 135-146.

10.1007/BF03326125
16

Ranjan, P., Kazama, S., Sawamoto, M., 2006, Effects of climate and land use changes on groundwater resources in coastal aquifers, J. Environ. Manage., 80, 25-35. doi:https://doi.org/10.1016/j.jenvman.2005.08.008.

10.1016/j.jenvman.2005.08.008
17

Shin, J. and Hwang, S., 2020, A borehole-based approach for seawater intrusion in heterogeneous coastal aquifers, eastern part of Jeju Island, Korea, Water, 12(2), 609.

10.3390/w12020609
18

Sulzbacher, H., Wiederhold, H., Siemon, B., Grinat, M., Igel, J., Burschil, T., Günther, T., and Hinsby, K., 2012, Numerical modelling of climate change impacts on freshwater lenses on the North Sea Island of Borkum using hydrological and geophysical methods, Hydrol. Earth Syst. Sci., 16, 3621-3643. doi: 10.5194/hess-16-3621-2012.

10.5194/hess-16-3621-2012
19

Vandenbohede, A. and Lebbe, L., 2002, Numerical modelling and hydrochemical characterisation of a fresh-water lens in the Belgian coastal plain, Hydrogeol. J., 10, 576-586. https://doi.org/10.1007/s10040-002-0209-5

10.1007/s10040-002-0209-5
20

Werner, A.D., Ward, J.D., Morgan, L.K., Simmons, C.T., Robinson, N.I., and Teubner, M.D., 2011, Vulnerability Indicators of Sea Water Intrusion, Ground Water, 50(1), 48-58 doi:10.1111/j.1745-6584.2011.00817.x.

10.1111/j.1745-6584.2011.00817.x
21

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

10.1016/j.advwatres.2012.03.004
Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 26
  • No :6
  • Pages :95-105
  • Received Date : 2021-11-29
  • Revised Date : 2021-12-06
  • Accepted Date : 2021-12-14
  • DOI :https://doi.org/10.7857/JSGE.2021.26.6.095
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