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231224s2015 xx |||||o 00| ||eng c |
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|a 10.1111/gwat.12168
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|a eng
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|a Wood, Cameron
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|4 aut
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|a Influence of seasonal variations in sea level on the salinity regime of a coastal groundwater-fed wetland
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|c 2015
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|a Text
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|a ƒaComputermedien
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|a Date Completed 07.10.2015
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|a Date Revised 06.01.2015
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2014, National Ground Water Association.
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|a Seasonal variations in sea level are often neglected in studies of coastal aquifers; however, they may have important controls on processes such as submarine groundwater discharge, sea water intrusion, and groundwater discharge to coastal springs and wetlands. We investigated seasonal variations in salinity in a groundwater-fed coastal wetland (the RAMSAR listed Piccaninnie Ponds in South Australia) and found that salinity peaked during winter, coincident with seasonal sea level peaks. Closer examination of salinity variations revealed a relationship between changes in sea level and changes in salinity, indicating that sea level-driven movement of the fresh water-sea water interface influences the salinity of discharging groundwater in the wetland. Moreover, the seasonal control of sea level on wetland salinity seems to override the influence of seasonal recharge. A two-dimensional variable density model helped validate this conceptual model of coastal groundwater discharge by showing that fluctuations in groundwater salinity in a coastal aquifer can be driven by a seasonal coastal boundary condition in spite of seasonal recharge/discharge dynamics. Because seasonal variations in sea level and coastal wetlands are ubiquitous throughout the world, these findings have important implications for monitoring and management of coastal groundwater-dependent ecosystems
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Harrington, Glenn A
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