Details
| Original language | English |
|---|---|
| Pages (from-to) | 423-434 |
| Number of pages | 12 |
| Journal | Advances in water resources |
| Volume | 111 |
| Early online date | 20 Nov 2017 |
| Publication status | Published - Jan 2018 |
Abstract
Ocean surges cause seawater inundation of coastal inland areas. Subsequently, seawater infiltrates into coastal aquifers and threatens the fresh groundwater resource. The severity of resulting salinization can be affected by hydrogeological factors including aquifer properties and hydrologic conditions, however, little research has been done to assess these effects. To understand the impacts of hydrogeological factors on groundwater salinization, we numerically simulated an ocean-surge inundation event on a two-dimensional conceptual coastal aquifer using a coupled surface-subsurface approach. We varied model permeability (including anisotropy), inland hydraulic gradient, and recharge rate. Three salinization-assessment indicators were developed, based on flushing time, depth of salt penetration, and a combination of the two, weighted flushing time, with which the impact of hydrogeological factors on groundwater vulnerability to salinization were quantitatively assessed. The vulnerability of coastal aquifers increases with increasing isotropic permeability. Low horizontal permeability (kx) and high vertical permeability (kz) lead to high aquifer vulnerability, and high kx and low kz lead to low aquifer vulnerability. Vulnerability decreases with increasing groundwater hydraulic gradient and increasing recharge rate. Additionally, coastal aquifers with a low recharge rate (R ≤ 300 mm yr−1) may be highly vulnerable to ocean-surge inundation. This study shows how the newly introduced indicators can be used to quantitatively assess coastal aquifer vulnerability. The results are important for global vulnerability assessment of coastal aquifers to ocean-surge inundation.
Keywords
- Coastal aquifer, Hydrogeological characteristics, Ocean surge, Salinization
ASJC Scopus subject areas
- Environmental Science(all)
- Water Science and Technology
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In: Advances in water resources, Vol. 111, 01.2018, p. 423-434.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Impact of hydrogeological factors on groundwater salinization due to ocean-surge inundation
AU - Yang, Jie
AU - Zhang, Huichen
AU - Yu, Xuan
AU - Graf, Thomas
AU - Michael, Holly A.
N1 - Funding information: This research was supported by the Deutsche Forschungsgemeinschaft (DFG) under grant number GR 3463/2-1 and by the US National Science Foundation (NSF) EPSCoR grant IIA-1301765. This research was initiated while Jie Yang was a visiting scholar at the University of Delaware and completed at Leibniz Universität Hannover. Assistance from these institutes is appreciated.
PY - 2018/1
Y1 - 2018/1
N2 - Ocean surges cause seawater inundation of coastal inland areas. Subsequently, seawater infiltrates into coastal aquifers and threatens the fresh groundwater resource. The severity of resulting salinization can be affected by hydrogeological factors including aquifer properties and hydrologic conditions, however, little research has been done to assess these effects. To understand the impacts of hydrogeological factors on groundwater salinization, we numerically simulated an ocean-surge inundation event on a two-dimensional conceptual coastal aquifer using a coupled surface-subsurface approach. We varied model permeability (including anisotropy), inland hydraulic gradient, and recharge rate. Three salinization-assessment indicators were developed, based on flushing time, depth of salt penetration, and a combination of the two, weighted flushing time, with which the impact of hydrogeological factors on groundwater vulnerability to salinization were quantitatively assessed. The vulnerability of coastal aquifers increases with increasing isotropic permeability. Low horizontal permeability (kx) and high vertical permeability (kz) lead to high aquifer vulnerability, and high kx and low kz lead to low aquifer vulnerability. Vulnerability decreases with increasing groundwater hydraulic gradient and increasing recharge rate. Additionally, coastal aquifers with a low recharge rate (R ≤ 300 mm yr−1) may be highly vulnerable to ocean-surge inundation. This study shows how the newly introduced indicators can be used to quantitatively assess coastal aquifer vulnerability. The results are important for global vulnerability assessment of coastal aquifers to ocean-surge inundation.
AB - Ocean surges cause seawater inundation of coastal inland areas. Subsequently, seawater infiltrates into coastal aquifers and threatens the fresh groundwater resource. The severity of resulting salinization can be affected by hydrogeological factors including aquifer properties and hydrologic conditions, however, little research has been done to assess these effects. To understand the impacts of hydrogeological factors on groundwater salinization, we numerically simulated an ocean-surge inundation event on a two-dimensional conceptual coastal aquifer using a coupled surface-subsurface approach. We varied model permeability (including anisotropy), inland hydraulic gradient, and recharge rate. Three salinization-assessment indicators were developed, based on flushing time, depth of salt penetration, and a combination of the two, weighted flushing time, with which the impact of hydrogeological factors on groundwater vulnerability to salinization were quantitatively assessed. The vulnerability of coastal aquifers increases with increasing isotropic permeability. Low horizontal permeability (kx) and high vertical permeability (kz) lead to high aquifer vulnerability, and high kx and low kz lead to low aquifer vulnerability. Vulnerability decreases with increasing groundwater hydraulic gradient and increasing recharge rate. Additionally, coastal aquifers with a low recharge rate (R ≤ 300 mm yr−1) may be highly vulnerable to ocean-surge inundation. This study shows how the newly introduced indicators can be used to quantitatively assess coastal aquifer vulnerability. The results are important for global vulnerability assessment of coastal aquifers to ocean-surge inundation.
KW - Coastal aquifer
KW - Hydrogeological characteristics
KW - Ocean surge
KW - Salinization
UR - http://www.scopus.com/inward/record.url?scp=85036468035&partnerID=8YFLogxK
U2 - 10.1016/j.advwatres.2017.11.017
DO - 10.1016/j.advwatres.2017.11.017
M3 - Article
AN - SCOPUS:85036468035
VL - 111
SP - 423
EP - 434
JO - Advances in water resources
JF - Advances in water resources
SN - 0309-1708
ER -