Groundwater and pore water inputs to the coastal zone

Burnett, William C.; Bokuniewicz, Henry; Huettel, Markus; Moore, Willard S.; Taniguchi, Makoto

doi:10.1023/b:biog.0000006066.21240.53

Cited by 851 publications

(487 citation statements)

References 93 publications

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“…Global water budget and integrated hydrologic-hydrogeological approaches suggest FSGD may account for 0.3 to 16% of the total freshwater discharge to oceans [Zektser and Loaiciga, 1993;Burnett et al, 2003]. FSGD is 11 highly variable at small and large scales, and depends on various geological, hydrological and climate factors.…”

Section: Rechargementioning

confidence: 99%

“…Over the last 30 y, it has become well established that the total flux of water from coastal aquifers to the ocean (termed submarine groundwater discharge, SGD) is an important component of the hydrologic cycle and can be a major pathway for delivering chemicals across the land-ocean interface [Moore, 1996;Burnett et al, 2003;Moore, 2010]. Field investigations around the world have documented coastal settings where SGD is an important source of freshwater Burnett et al, 2006;Stalker et al, 2009;Wang et al, 2015], nutrients Shellenbarger et al, 2006;Lee et al, 2009;Luo et al, 2014], carbon [Cai et al, 2003;Goni and Gardner, 2003] and trace elements Beck et al, 2007;Beck et al, 2010] into the coastal and open ocean.…”

Section: Introductionmentioning

confidence: 99%

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Groundwater dynamics in subterranean estuaries of coastal unconfined aquifers: Controls on submarine groundwater discharge and chemical inputs to the ocean

Robinson¹,

Xin²,

Santos³

et al. 2018

Advances in Water Resources

216

148

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Sustainable coastal resource management requires sound understanding of interactions between coastal unconfined aquifers and the ocean as these interactions influence the flux of chemicals to the coastal ocean and the availability of fresh groundwater resources. The importance of submarine groundwater discharge in delivering chemical fluxes to the coastal ocean and the critical role of the subterranean estuary (STE) in regulating these fluxes is well recognized. STEs are complex and dynamic systems exposed to various physical, hydrological, geological, and chemical conditions that act on disparate spatial and temporal scales. This paper provides a review of the effect of factors that influence flow and salt transport in STEs, evaluates current understanding on the interactions between these influences, and synthesizes understanding of drivers of nutrient, carbon, greenhouse gas, metal and organic contaminant fluxes to the ocean.Based on this review, key research needs are identified. While the effects of density and tides are well understood, episodic and longer-period forces as well as the interactions between multiple influences remain poorly understood. Many studies continue to focus on idealized nearshore aquifer systems and future work needs to consider real world complexities such as geological heterogeneities, and non-uniform and evolving alongshore and cross-shore morphology. There is also a significant need for multidisciplinary research to unravel the interactions between physical and biogeochemical processes in the STE, as most existing studies treat these processes in isolation. Better understanding of this complex and dynamic system can improve sustainable management of coastal water resources under the influence of anthropogenic pressures and climate change.

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Section: Rechargementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Groundwater dynamics in subterranean estuaries of coastal unconfined aquifers: Controls on submarine groundwater discharge and chemical inputs to the ocean

Robinson¹,

Xin²,

Santos³

et al. 2018

Advances in Water Resources

216

148

View full text Add to dashboard Cite

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“…Moore, 1996;Burnett et al, 2003;Moore et al, 2008) and islands (e.g. Cardenas et al, 2010;Huang et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Chemical weathering fluxes from volcanic islands and the importance of groundwater: The Hawaiian example

Schopka

Derry

2012

Earth and Planetary Science Letters

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We investigated the products and rates of chemical weathering on the Hawaiian Islands, sampling streams on Kaua'i and both streams and groundwater wells on the island of Hawai'i. Dissolved silica was used to investigate the flowpaths of water drained into streams. We found that flowpaths exert a major control on the observed chemical weathering rates. A strong link exists between the degree of landscape dissection and flowpaths of water through the landscape, with streams in undissected landscapes receiving water mainly from surface runoff and streams in highly dissected landscapes receiving a considerable fraction of their water from groundwater (springs and/or seepage). Total alkalinity in Hawaiian streams and groundwater is produced exclusively by silicate chemical weathering. We find that fluxes of total alkalinity (often called "CO 2 consumption rate" in the geochemical literature), from the islands are lower than those observed in basaltic regions elsewhere. Groundwater is, overall, the major transport vector for products of chemical weathering from the Hawaiian Islands. On the youngest and largest island, submarine groundwater discharge (SGD) transports more than an order of magnitude more solutes to the ocean than surface water and on the youngest part of the youngest island, SGD is the only link between the terrestrial weathering system and the ocean. These results suggest that groundwater, and particularly SGD, needs to be included in geochemical weathering budgets of volcanic islands.

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“…For example, seawater circulates through a coastal aquifer under the force of gravity (Li et al, 1999;Li and Jiao, 2003), from oceanic forces such as waves and tides (Taniguchi et al, 2002;Burnett et al, 2003), as a result of dispersive circulation along the freshwater-saltwater boundary within the aquifer (Kohout, 1960), and from changes in upland recharge (Michael et al, 2005).…”

Section: Groundwater Flow At the Coastmentioning

confidence: 99%