Field measurement and modeling of near-bed sediment transport processes with fluid mud layer in Tokyo Bay

Nakagawa, Yasuyuki; Nadaoka, Kazuo; Yagi, Hiroshi; Ariji, Ryuichi; Yoneyama, Haruo; Shirai, Kohji

doi:10.1007/s10236-012-0570-4

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…1), for which measured concentrations of cVMS have been determined in sediment. 33 Tokyo Bay is a large semienclosed marine environment with a surface area of approximately 992 km 2 and a mean depth of approximately 15-19 m. 34,35 It receives wastewater from a catchment inhabited by approximately 29 million people. 36 Approximately 8.7 million of these people live in Tokyo itself and the rest live in the surrounding area draining to the Bay.…”

Section: Methodsmentioning

confidence: 99%

Uncertainty and equifinality in environmental modelling of organic pollutants with specific focus on cyclic volatile methyl siloxanes

Whelan

Kim

Suganuma

et al. 2019

Environ. Sci.: Processes Impacts

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Section: Methodsmentioning

confidence: 99%

Uncertainty and equifinality in environmental modelling of organic pollutants with specific focus on cyclic volatile methyl siloxanes

Whelan

Kim

Suganuma

et al. 2019

Environ. Sci.: Processes Impacts

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“…The driving layer having an invariant flow thickness contains the major fraction of suspended grains [8]. Moreover, sediment concentration profiles in turbidity currents exhibit a sharp gradient, called the lutocline [9,10]. In the literature, several mechanisms underlying the initiation of turbidity currents have been documented.…”

Section: Introductionmentioning

confidence: 99%

Stability of longitudinal sediment waves formed by turbidity currents: linear and weakly nonlinear perspectives

Mahato,

Ali,

Dey

2023

Proc. R. Soc. A.

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We perform the linear and weakly nonlinear stability analyses of longitudinal sediment waves triggered by the interaction of turbidity currents with an erodible bed. The mathematical framework is based on the two-dimensional flow equations, advection–diffusion equation for sediment concentration and Exner equation for bed evolution. Using the standard linearization, the linear analysis offers the resonant wavenumber that maximizes the growth rate of sediment waves. We study the influence of the key parameters, such as the gravitational parameter, longitudinal bed slope, Rouse number, shear Reynolds number, relative roughness number and erosion coefficient, on the growth rate, resonant wavenumber and phase velocity. The results reveal that the longitudinal sediment waves migrate both upstream and downstream. By plotting the gravitational parameter against the dimensionless wavenumber, we obtain a stability diagram that accurately captures the experimental data plots within the unstable zone. Additionally, we explore the perturbation fields of velocity components, pressure and sediment concentration. Employing the centre manifold projection, the weakly nonlinear analysis provides the equilibrium amplitude of sediment waves and its sensitivity to the key parameters. The predicted wavelength and amplitude of sediment waves are comparable with field observations in the Atlantic Ocean, the Sea of Japan and the Pacific Ocean.

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“…Above 150-200 g/l, the material settles in a hindered settling regime where segregation is limited or even prevented. Nakagawa et al (2012) describe the persistent existence of fluid mud in Tokyo Bay, with thickness of a few decimeters. This fluid mud may be the result of abundant organic material, formed under eutrophic conditions in the bay.…”

mentioning

confidence: 99%

The 2011 International Conference on Cohesive Sediment Transport (INTERCOH 2011)

Winterwerp

Manning

2015

Ocean Dynamics

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Field measurement and modeling of near-bed sediment transport processes with fluid mud layer in Tokyo Bay

Cited by 7 publications

References 14 publications

Uncertainty and equifinality in environmental modelling of organic pollutants with specific focus on cyclic volatile methyl siloxanes

Uncertainty and equifinality in environmental modelling of organic pollutants with specific focus on cyclic volatile methyl siloxanes

Stability of longitudinal sediment waves formed by turbidity currents: linear and weakly nonlinear perspectives

The 2011 International Conference on Cohesive Sediment Transport (INTERCOH 2011)

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