Dynamics of submarine groundwater discharge and freshwater‐seawater interface

Taniguchi, Makoto; Ishitobi, Tomotoshi; Shimada, Jun

doi:10.1029/2005jc002924

Cited by 82 publications

(64 citation statements)

References 30 publications

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“…Corbett et al, 1999;de Sieyes et al, 2008;Knee et al, 2010;Paytan et al, 2006;Slomp and Van Cappellen, 2004). Many studies have documented the impact of SGD in different environments (Burnett et al, 2003;Moore, 2010;Taniguchi et al, 2006), however SGD in karst environments may be particularly important due to rapid recharge and channelized flow pathways through fractures and cave systems. Specifically two types of flows may be present in karst systems: (1) focused fracture flow (conduits), and (2) diffuse flow through porous medium (Fleury et al, 2007;Moore et al, 1993;Perry et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Composition and fluxes of submarine groundwater along the Caribbean coast of the Yucatan Peninsula

Null

Knee

Crook

et al. 2014

Continental Shelf Research

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a b s t r a c tSubmarine groundwater discharge (SGD) to the coastal environment along the eastern Yucatan Peninsula, Quintana Roo, Mexico was investigated using a combination of tracer mass balances and analytical solutions. Two distinct submarine groundwater sources including water from the unconfined surficial aquifer discharging at the beach face and water from a deeper aquifer discharging nearshore through submarine springs (ojos) were identified. The groundwater of nearshore ojos was saline and significantly enriched in short-lived radium isotopes ( 223 Ra, 224 Ra) relative to the unconfined aquifer beach face groundwater. We estimated SGD from ojos using 223 Ra and used a salinity mass balance to estimate the freshwater discharge at the beach face. Analytical calculations were also used to estimate wave set-up and tidally driven saline seepage into the surf zone and were compared to the salinity-based freshwater discharge estimates. ). Discharge at the beach face was in the range of 3.3-8.5 m 3 d À 1 m À 1 for freshwater and 2.7 m 3 d À 1 m À 1 for saline water based on the salinity mass balance and wave-and tidally-driven discharge, respectively. Although discharge from the ojos was larger in volume than discharge from the unconfined aquifer at the beach face, dissolved inorganic nitrogen (DIN) was significantly higher in beach groundwater; thus, discharge of this unconfined beach aquifer groundwater contributed significantly to total DIN loading to the coast. DIN fluxes were up to 9.9 mol d À 1 m À 1 from ojos and 2.1 mol d À 1 m À 1 from beach discharge and varied regionally along the 500 km coastline sampled. These results demonstrate the importance of considering the beach zone as a significant nutrient source to coastal waters for future management strategies regarding nutrient loading to reef environments and coastal development. This study also identifies the importance of understanding the connectivity of submarine spring discharge to the nearshore coastal environment and the impact of inland anthropogenic activities may have on coastal health.

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Section: Introductionmentioning

confidence: 99%

Composition and fluxes of submarine groundwater along the Caribbean coast of the Yucatan Peninsula

Null

Knee

Crook

et al. 2014

Continental Shelf Research

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“…Between these two plumes forms a freshwater discharge path, through which fresh groundwater discharges near the low tide mark. This actually explains the field observations that the major portion of the seaward groundwater seepage usually occurs in the shallow part of the submerged beach [56][57][58][59][60]. The salt plume hanging beneath the beach surface forms a small scale seawater-groundwater circulation: seawater infiltrates into the beach in the upper intertidal zone and exits near the low tide mark.…”

Section: Tidal Effects On Salinity Distributions In Coastal Aquifersmentioning

confidence: 95%

Quantifying tidal contribution to submarine groundwater discharges: A review

Jiao

2013

Chin. Sci. Bull.

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Submarine groundwater discharges (SGD), consisting of groundwater flow from both terrestrial and marine origins, is an important source of nutrients, contaminants, and other chemicals to the coastal waters, and has significant impacts and implications on coastal environment and ecology. This paper reviews the recent advances in quantifying the tide-induced SGD in various beach aquifers around the world by means of mathematical modeling, laboratory experiments, and field observations or their combinations. Numerous studies have shown that (1) the order of magnitude of SGD around the world estimated by radium isotope tracers typically ranges from 10 2 to 10 3 m 3 d 1 m 1 of the shoreline, (2) SGD is mainly of marine origin, i.e. the re-circulated seawater across the aquifer-sea interface, and (3) tide is one of the major forces driving seawater-groundwater circulation. The order of magnitude of the tidal contributions to SGD from beach aquifers reported in the literature is only 10 m 3 d 1 m 1 length of shoreline, at least one order of magnitude smaller than the total SGD estimated by radium isotope tracers. This is obviously in contradiction with (3). The possible reasons for this contradiction may include (1) underestimation of the shoreline length due to neglecting many headlands, bays and banks of tidal rivers, and (2) negligence of the seawater-groundwater exchange from the seabed ranging from the nearshore areas to the continental shelf. Further research is needed to understand more about the contradiction.submarine groundwater discharges (SGD), radium isotope tracer method, numerical model of beach aquifer, densitydependent flow, tide-induced SGD Citation: Li H L, Jiao J J. Quantifying tidal contribution to submarine groundwater discharges: A review.

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“…At many sites worldwide, particularly in arid or semi-arid locations where freshwater recharge is limited or groundwater is overdrawn, recirculated seawater may account for a significant component of SGD Shellenbarger et al 2006;Taniguchi et al 2006Taniguchi et al , 2007Swarzenski and Izbicki 2009). Although the volume contribution of SGD to coastal and estuarine systems is typically much smaller than that of surface runoff (rivers, streams, etc.…”

Section: Introductionmentioning

confidence: 99%

“…SGD to the coastal ocean includes both terrestrially derived freshwater and recirculated seawater from tidal and wave pumping, density differences, and bioirrigation Michael et al 2005;Taniguchi et al 2006). At many sites worldwide, particularly in arid or semi-arid locations where freshwater recharge is limited or groundwater is overdrawn, recirculated seawater may account for a significant component of SGD Shellenbarger et al 2006;Taniguchi et al 2006Taniguchi et al , 2007Swarzenski and Izbicki 2009).…”

Section: Introductionmentioning

confidence: 99%

Submarine Groundwater Discharge-Derived Nutrient Loads to San Francisco Bay: Implications to Future Ecosystem Changes

Null

Dimova

Knee

et al. 2012

Estuaries and Coasts

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Submarine groundwater discharge (SGD) was quantified at select sites in San Francisco Bay (SFB) from radium ( 223 Ra and 224 Ra) and radon ( 222 Rn) activities measured in groundwater and surface water using simple mass balance box models. Based on these models, discharge rates in South and Central Bays were 0.3-7. − to NH 4 + available to phytoplankton with implications to bay productivity, phytoplankton species distribution, and nutrient uptake rates. This assessment of nutrient delivery via groundwater discharge in SFB may provide vital information for future bay ecological wellbeing and sensitivity to future environmental stressors.

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Dynamics of submarine groundwater discharge and freshwater‐seawater interface

Cited by 82 publications

References 30 publications

Composition and fluxes of submarine groundwater along the Caribbean coast of the Yucatan Peninsula

Composition and fluxes of submarine groundwater along the Caribbean coast of the Yucatan Peninsula

Quantifying tidal contribution to submarine groundwater discharges: A review

Submarine Groundwater Discharge-Derived Nutrient Loads to San Francisco Bay: Implications to Future Ecosystem Changes

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