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- Title
High-resolution observations of submarine groundwater discharge reveal the fine spatial and temporal scales of nutrient exposure on a coral reef: Faga'alu, AS.
- Authors
Oberle, Ferdinand K. J.; Prouty, Nancy G.; Swarzenski, Peter W.; Storlazzi, Curt D.
- Abstract
Submarine groundwater discharge (SGD) can deliver substantial nutrient and contaminant loads to nearshore coral reefs. Correctly scaling SGD rates from a point source to a reef is generally a linear process involving simplified assumptions on the hydrogeology, bathymetry, and nearshore hydrodynamics that are essential to properly assess SGD scale and impact to individual coral heads. Here, we apply high-resolution SGD techniques to provide information at the scale of individual coral heads in Faga'alu Bay, American Samoa, where focused SGD delivers a plume of freshened and nutrient-rich water directly to the adjacent coral reef. Unoccupied Aerial System-based measurements were used to acquire remotely sensed, calibrated, high-resolution thermal infrared imagery that were coupled with traditional in-situ SGD observations. This approach permits a detailed assessment of SGD and associated nutrient loadings to individual coral heads as a function of time and enables a more realistic method to quantify SGD impact.
- Subjects
AMERICAN Samoa; CORAL reef conservation; CORALS; CORAL reefs &; islands; GROUNDWATER; HYDROGEOLOGY; REEFS; HYDRODYNAMICS
- Publication
Coral Reefs, 2022, Vol 41, Issue 4, p849
- ISSN
0722-4028
- Publication type
Article
- DOI
10.1007/s00338-022-02245-8