The driving forces of porewater and groundwater flow in permeable coastal sediments: A review

Santos, Isaac R.; Eyre, Bradley D.; Huettel, Markus

doi:10.1016/j.ecss.2011.10.024

Cited by 503 publications

(373 citation statements)

References 159 publications

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“…Many physical and biological factors influence the level of nutrient enrichment, as well as the type and severity of consequences to an ecosystem's functioning. Nutrient cycling and efflux from the sediments are influenced by the sedimentary environment (Blackburn and Henriksen, 1983;Glud, 2008;Santos et al, 2012), benthic macrofauna (Bertics et al, 2010;Laverock et al, 2011), and macrophyte communities (Kenworthy et al, 1982). Our results show that primary consideration should be given to benthic macrofauna and sediment properties when estimating potential enrichment levels of experiments.…”

Section: Discussionmentioning

confidence: 85%

“…Surface sediments are more likely to be influenced by water column hydrodynamics and pore water advection processes (review by Santos et al, 2012) which may speed up nutrient release from the fertiliser. Our method enriched the sediment profile at least from 0 to 7 cm depth, and is likely to elevate NH 4 + availability at the sediment water interface.…”

Section: Discussionmentioning

confidence: 99%

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In situ soft sediment nutrient enrichment: A unified approach to eutrophication field experiments

Douglas

Pilditch

Hines

et al. 2016

Marine Pollution Bulletin

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Adding fertiliser to sediments is an established way of studying the effects of eutrophication but a lack of consistent methodology, reporting on enrichment levels, or guidance on application rates precludes rigorous synthesis and meta-analysis. We developed a simple enrichment technique then applied it to 28 sites across an intertidal sandflat. Fertiliser application rates of 150 and 600 g N m −2 resulted in pore water ammonium concentrations respectively 1-110 and 4-580 × ambient, with greater elevations observed in deeper (5-7 cm) than surface (0-2 cm) sediments. These enrichment levels were similar to eutrophic estuaries and were maintained for at least seven weeks. The high between-site variability could be partially explained by the sedimentary environment and macrofaunal community (42%), but only at the high application rate. We suggest future enrichment studies should be conducted in situ across large environmental gradients to incorporate real world complexity and increase generality of conclusions.

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Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

In situ soft sediment nutrient enrichment: A unified approach to eutrophication field experiments

Douglas

Pilditch

Hines

et al. 2016

Marine Pollution Bulletin

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“…Reviews are available that focus on SGD including the underlying mechanisms (i.e., driving forces) Santos et al, 2012b], associated chemical fluxes to the ocean [Slomp and Van Cappellen, 2004;Moore, 2010;Knee and Paytan, 2012] and measurement techniques [Burnett et al, 2001;Taniguchi et al, 2003]. Similarly, reviews that provide a synthesis of the growing number of SGD field studies are available Kwon et al, 2014;Cho and Kim, 2016].…”

Section: Introductionmentioning

confidence: 99%

“…8 Smaller-scale water exchange processes including exchange induced by current-bedform interactions, bioirrigation and ripple migration are also not included. Santos et al [2012b] recently reviewed these physical drivers for SGD.…”

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

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198

138

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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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“…In some cases, deep aquifers may have fractures in confined upper layers -such as ruptures triggered by the depressions found along the shelf -which makes an exchange of fluids across the sediment-water interface possible. Santos et al (2012b) have shown that various physical processes may control submarine groundwater discharge in areas on the continental shelf.…”

Section: Introductionmentioning

confidence: 99%

Submarine groundwater discharge revealed by radium isotopes (Ra-223 and Ra-224) near a paleochannel on the Southern Brazilian continental shelf

et al. 2013

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A B S T R A C TSubmarine Groundwater Discharge (SGD) has been recognized as an important component of the ocean-continent interface. The few previous studies in Brazil have focused on nearshore areas. This paper explores SGD on the Southern Brazilian Continental Shelf using multiple lines of evidence that include radium isotopes, dissolved nutrients, and water mass observations. The results indicated that SGD may be occurring on the Continental Shelf in the Albardão region, near a paleochannel located 50 km offshore. This paleochannel may thus be a preferential pathway for the delivery of nutrientand metal-enriched groundwater and porewater into continental shelf waters. R E S U M OA descarga de água subterrânea ("Submarine Groundwater Discharge"; SGD) é um importante elo entre continente-oceano. No Brasil, embora haja um crescente interesse em estudos sobre este tema, eles ainda são raros e se restringem às zonas costeiras. A presente investigação explora as evidências SGD na Plataforma Continental do Sul do Brasil, as quais incluem isótopos de rádio, nutrientes dissolvidos e distribuição das massas d'água. Os resultados indicam que a SGD pode ocorrer na Plataforma Continental na região do Albardão, próximo a um paleocanal localizado a 50 km da costa. Esse paleocanal pode, assim, ser o caminho preferencial de entrada de nutrientes e de águas subterrâneas ricas em metais na plataforma continental.

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The driving forces of porewater and groundwater flow in permeable coastal sediments: A review

Cited by 503 publications

References 159 publications

In situ soft sediment nutrient enrichment: A unified approach to eutrophication field experiments

In situ soft sediment nutrient enrichment: A unified approach to eutrophication field experiments

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

Submarine groundwater discharge revealed by radium isotopes (Ra-223 and Ra-224) near a paleochannel on the Southern Brazilian continental shelf

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