scholarly journals Submarine Groundwater Discharge and Stream Baseflow Sustain Pesticide and Nutrient Fluxes in Faga'alu Bay, American Samoa

2019 ◽  
Vol 7 ◽  
Author(s):  
Eric M. Welch ◽  
Henrietta Dulai ◽  
Aly El-Kadi ◽  
Christopher K. Shuler
Keyword(s):  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
American Samoa ◽  
Nutrient Fluxes ◽  
Submarine Groundwater

scholarly journals Submarine groundwater discharge to Tampa Bay: Nutrient fluxes and biogeochemistry of the coastal aquifer

2007 ◽  
Vol 104 (1-2) ◽  
pp. 85-97 ◽  
Author(s):  
Kevin D. Kroeger ◽  
Peter W. Swarzenski ◽  
Wm. Jason Greenwood ◽  
Christopher Reich
Keyword(s):  
Coastal Aquifer ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Tampa Bay ◽  
Nutrient Fluxes ◽  
Submarine Groundwater

scholarly journals Storm-Driven Fresh Submarine Groundwater Discharge and Nutrient Fluxes From a Barrier Island

2021 ◽  
Vol 8 ◽  
Author(s):  
Dini Adyasari ◽  
Daniel Montiel ◽  
Behzad Mortazavi ◽  
Natasha Dimova
Keyword(s):  
Spatial Variability ◽  
Groundwater Flow ◽  
Coastal Area ◽  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Barrier Island ◽  
Barrier Islands ◽  
Nutrient Fluxes ◽  
Storm Events ◽  
Submarine Groundwater

Quantifying and characterizing groundwater flow and discharge from barrier islands to coastal waters is crucial for assessing freshwater resources and contaminant transport to the ocean. In this study, we examined the groundwater hydrological response, discharge, and associated nutrient fluxes in Dauphin Island, a barrier island located in the northeastern Gulf of Mexico. We employed radon (222Rn) and radium (Ra) isotopes as tracers to evaluate the temporal and spatial variability of fresh and recirculated submarine groundwater discharge (SGD) in the nearshore waters. The results from a 40-day continuous 222Rn time series conducted during a rainy season suggest that the coastal area surrounding Dauphin Island was river-dominated in the days after storm events. Groundwater response was detected about 1 week after the precipitation and peak river discharge. During the period when SGD was a factor in the nutrient budget of the coastal area, the total SGD rates were as high as 1.36 m day–1, or almost three times higher than detected fluxes during the river-dominated period. We found from a three-endmember Ra mixing model that most of the SGD from the barrier island was composed of fresh groundwater. SGD was driven by marine and terrestrial forces, and focused on the southeastern part of the island. We observed spatial variability of nutrients in the subterranean estuary across this part of the island. Reduced nitrogen (i.e., NH4+ and dissolved organic nitrogen) fluxes dominated the eastern shore with average rates of 4.88 and 5.20 mmol m–2 day–1, respectively. In contrast, NO3– was prevalent along the south-central shore, which has significant tourism developments. The contrasting nutrient dynamics resulted in N- and P-limited coastal water in the different parts of the island. This study emphasizes the importance of understanding groundwater flow and dynamics in barrier islands, particularly those urbanized, prone to storm events, or located near large estuaries.

Estimation of submarine groundwater discharge and associated nutrient fluxes in eastern Laizhou Bay, China using 222Rn

2016 ◽  
Vol 533 ◽  
pp. 103-113 ◽  
Author(s):  
Yan Zhang ◽  
Hailong Li ◽  
Xuejing Wang ◽  
Chunmiao Zheng ◽  
Chaoyue Wang ◽  
...  
Keyword(s):  
Submarine Groundwater Discharge ◽  
Groundwater Discharge ◽  
Laizhou Bay ◽  
Nutrient Fluxes ◽  
Submarine Groundwater
Sign in / Sign up

Export Citation Format

Share Document