Geotechnical properties and behavior of high-porosity, organic-rich sediments in Eckernförde Bay, Germany

Silva, A.J.; Brandes, Horst G.

doi:10.1016/s0278-4343(98)00063-6

Cited by 21 publications

(17 citation statements)

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“…The amplitude of these oscillations is heavily dependent on the sediment parameters described in such as the size and sphericity of the grains, as represented by Carman‐Kozeny parameter, ɛ, and the diameter of the sediment grains, d in , and the hydraulic conductivity, K . The latter two values were measured and averaged for Eckernförde Bay sediments by Silva and Brandes [1998] (average d = 2 × 10 −4 cm, average K = 5 × 10 −6 cm s −1 ) and can thus be used to make an estimate of ɛ through the Carman‐Kozeny equation used in the model: where η a is the dynamic viscosity of the aqueous phase. The resulting value for ɛ is about seven times lower than the best fit value obtained in the model (Figure 5), which is indicative of the wide range of uncertainties present in the gas transport equation.…”

Section: Resultsmentioning

confidence: 99%

Impact of seasonal temperature and pressure changes on methane gas production, dissolution, and transport in unfractured sediments

et al. 2011

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[1] A one-dimensional reaction-transport model is used to investigate the dynamics of methane gas in coastal sediments in response to intra-annual variations in temperature and pressure. The model is applied to data from two shallow water sites in Eckernförde Bay (Germany) characterized by low and high rates of upward fluid advection. At both sites, organic matter is buried below the sulfate-reducing zone to the methanogenic zone at sufficiently high rates to allow supersaturation of the pore water with dissolved methane and to form a free methane gas phase. The methane solubility concentration varies by similar magnitudes at both study sites in response to bottom water temperature changes and leads to pronounced peaks in the gas volume fraction in autumn when the methanic zone temperature is at a maximum. Yearly hydrostatic pressure variations have comparatively negligible effects on methane solubility. Field data suggest that no free gas escapes to the water column at any time of the year. Although the existence of gas migration cannot be substantiated by direct observation, a speculative mechanism for slow moving gas is proposed here. The model results reveal that free gas migrating upward into the undersaturated pore water will completely dissolve and subsequently be consumed above the free gas depth (FGD) by anaerobic oxidation of methane (AOM). This microbially mediated process maintains methane undersaturation above the FGD. Although the complexities introduced by seasonal changes in temperature lead to different seasonal trends for the depth-integrated AOM rates and the FGD, both sites adhere to previously developed prognostic indicators for methane fluxes based on the FGD.Citation: Mogollón, J. M., A. W. Dale, I. L'Heureux, and P. Regnier (2011), Impact of seasonal temperature and pressure changes on methane gas production, dissolution, and transport in unfractured sediments,

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Section: Resultsmentioning

confidence: 99%

Impact of seasonal temperature and pressure changes on methane gas production, dissolution, and transport in unfractured sediments

et al. 2011

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“…• Sediment bulk density is taken as ρ = 1240 kg m −3 (Silva and Brandes, 1998;Anderson et al, 1998;Richardson and Briggs, 1996), and effective overburden stress as σ z = 1.5 kPa (Silva and Brandes, 1998).…”

Section: Simulation Conditionsmentioning

confidence: 99%

Methane bubble growth in fine-grained muddy aquatic sediment: Insight from modeling

Katsman

Ostrovsky

Makovsky

2013

Earth and Planetary Science Letters

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“…Electrical resistivity and physical properties of marine sediments and rocks are also important variables for understanding the geological events of depositional environments, the effects of mechanical and chemical diagenesis with burial depth after deposition, and seafloor investigation of ocean engineering and naval applications (Hamilton, 1980;Hamilton and Bachman, 1982;Silva and Brandes, 1998). In general, physical properties of marine sediments significantly reflect the variation of sediment texture, but sediments and rocks from Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) drill sites are slightly different due to digenesis (e.g., compaction, consolidation, alteration, and deformation of sediment) after deposition (Hamilton, 1980;Hamilton and Bachman, 1982).…”

Section: Introductionmentioning

confidence: 99%

The relationship between silica diagenesis and physical properties in the East/Japan Sea: ODP Legs 127/128

Kim

Yoo

Lee

et al. 2007

Journal of Asian Earth Sciences

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Geotechnical properties and behavior of high-porosity, organic-rich sediments in Eckernförde Bay, Germany

Cited by 21 publications

References 0 publications

Impact of seasonal temperature and pressure changes on methane gas production, dissolution, and transport in unfractured sediments

Impact of seasonal temperature and pressure changes on methane gas production, dissolution, and transport in unfractured sediments

Methane bubble growth in fine-grained muddy aquatic sediment: Insight from modeling

The relationship between silica diagenesis and physical properties in the East/Japan Sea: ODP Legs 127/128

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