Submarine Groundwater Discharge to a High-Energy Surf Zone at Stinson Beach,California, Estimated Using Radium Isotopes |
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Authors: | Nicholas R de Sieyes Kevan M Yamahara Adina Paytan Alexandria B Boehm |
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Institution: | (1) Environmental Water Studies, Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305, USA;(2) Institute of Marine Sciences, Earth & Planetary Sciences Department, University of California Santa Cruz, Santa Cruz, CA 95064, USA |
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Abstract: | Two 14-day experiments conducted in the dry summer (July 2006) and wet winter (March 2007) seasons, respectively, examined
tidal, wave-driven, and seasonal variability of submarine groundwater discharge (SGD) at Stinson Beach, CA, using natural
radium tracers. Tide stage, tide range, breaker height, and season each explained a significant degree of radium variability
in the surf zone. A mass balance of excess radium in the surf zone was used to estimate SGD for each season, confirming larger
discharge rates during the wet season. Our results indicate median groundwater discharge rates of 6 to 8 L min−1 m−1 in July 2006 and 38 to 43 L min−1 m−1 in March 2007. SGD from 200 m of Stinson Beach in March 2007 contributed a flux of phosphate and dissolved inorganic nitrogen
approximately equal to that associated with all local creeks and streams within 6 km of the study site at that time. |
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