Development of a Sampler for Measurement of Gas Content in Soils

Sandven, Rolf; Husby, Ellen; Husby, J. E.; Jønland, J.; Roksvåg, K. O.; Stæhli, F.; Tellugen, R.

doi:10.1061/(asce)0733-950x(2007)133:1(3)

Cited by 10 publications

(7 citation statements)

References 7 publications

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“…This result further demonstrated that the sand was practically air free, and therefore the measurements of pore pressure gradient was free of air content of the seabed. At this junction, we add that measurements of air/gas content are still a challenge in the field of soil mechanics, and no generally accepted method exists today to measure air/gas content (a comprehensive review can be found in the work of [ Sandven et al , 2007]). Since the subject is beyond the scope of the present study, it will not be pursued further.…”

Section: Methodsmentioning

confidence: 99%

Flow and sediment transport induced by a plunging solitary wave

Sumer¹,

Sen²,

Karagali³

et al. 2011

J. Geophys. Res.

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[1] Two parallel experiments involving the evolution and runup of plunging solitary waves on a sloping bed were conducted: (1) a rigid-bed experiment, allowing direct (hot film) measurements of bed shear stresses and (2) a sediment-bed experiment, allowing for the measurement of pore water pressures and for observation of the morphological changes. The two experimental conditions were kept as similar as possible. The experiments showed that the complete sequence of the plunging solitary wave involves the following processes: shoaling and wave breaking; runup; rundown and hydraulic jump; and trailing wave. The bed shear stress measurements showed that the mean bed shear stress increases tremendously (with respect to that in the approaching wave boundary layer), by as much as a factor of 8, in the runup and rundown stages, and that the RMS value of the fluctuating component of the bed shear stress is also affected, by as much as a factor of 2, in the runup and hydraulic jump stages. The pore water pressure measurements showed that the sediment at (or near) the surface of the bed experiences upward directed pressure gradient forces during the down-rush phase. The magnitude of this force can reach values as much as approximately 30% of the submerged weight of the sediment. The experiments further showed that the sediment transport occurs in the sheet flow regime for a substantial portion of the beach covering the area where the entire sequence of the wave breaking takes place. The bed morphology is explained qualitatively in terms of the measured bed shear stress and the pressure gradient forces.

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Section: Methodsmentioning

confidence: 99%

Flow and sediment transport induced by a plunging solitary wave

Sumer¹,

Sen²,

Karagali³

et al. 2011

J. Geophys. Res.

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“…The gas (most common Hydrogen 858 Sulphid) can stem from deterioration of organic material, and there is nearly always a small fraction of gas 859 as a part of the fluid in the seabed, but it is difficult to measure, see e.g. Sandven (2007). Tørum (2007) 860 suggests that 3% gas content may be enough to introduce liquefaction at the seabed.…”

Section: Spoilers 697mentioning

confidence: 99%

Pipeline–Seabed Interaction

Fredsøe

2016

J. Waterway, Port, Coastal, Ocean Eng.

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“…In addition, sand grain mobility inside the soil has been determined. Due to large amounts of gas content (Sandven and Long, 2005), pressure variations modify the trapped air bubbles size and therefore the sand grain arrangement at great depths.…”

Section: Discussionmentioning

confidence: 99%

An Optical System for Monitoring Seabed Evolutions at a Coastal Structure

Michallet

Barbier-Neyret

Mory

et al. 2006

Coastal Dynamics 2005

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An optical system has been designed for measuring the bed level, sand grain motions inside the soil and the presence of suspension at the toe of a coastal structure exposed to breaking waves. These measurements were conducted in the framework of the LIMAS project. We show that the soil is not strictly stable even at great depths (about 1 m). The generation of pressure differences in the soil is the main mechanism for this instability at the wall facing the waves. At the corner of the structure, the shear induced by large longitudinal velocities enhances the sediment transport and scour.

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Development of a Sampler for Measurement of Gas Content in Soils

Cited by 10 publications

References 7 publications

Flow and sediment transport induced by a plunging solitary wave

Flow and sediment transport induced by a plunging solitary wave

Pipeline–Seabed Interaction

An Optical System for Monitoring Seabed Evolutions at a Coastal Structure

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