Internal hydraulics of a sediment-stratified channel flow

Adams, Charles E.; Wells, John T.; Park, Yong-Ahn

doi:10.1016/0025-3227(90)90045-l

Cited by 27 publications

(6 citation statements)

References 27 publications

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“…Strong tidal currents and higher waves produce a complex and dynamic hydraulic regime in terms of sediment erosion and deposition (Song et al, 1983;Adams et al, 1990;Alexander et al, 1991;Wells and Park, 1992). Sediment materials eroded at the top of HMB might be expanded toward the deeper region in the manner of mass flow transport patterns.…”

Section: Foraminiferal Test Featuresmentioning

confidence: 98%

“…Seasonal fluctuations of climatic and sea conditions are also extreme due to the typical monsoon with severe winter storms and sporadic summer typhoons. The large tidal ranges and strong tidal currents along the coast produce a complex and dynamic hydraulic regime in terms of sediment erosion and deposition in the nearshore areas (Song et al, 1983;Adams et al, 1990;Alexander et al, 1991;Wells and Park, 1992) and also along the inner shelf area (Lee and Chu, 2001). Surface sediments are composed of gravel, gravelly sandy mud~gravelly muddy sand facies, muddy sand~sandy mud facies, and mud facies (Fig.…”

Section: Oceanographic Settingmentioning

confidence: 98%

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The effects of depositional processes on benthic foraminiferal taphonomy in the Southeastern Yellow Sea of Korea

2011

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To understand the role of depositional processes on the distribution of benthic foraminifera, grain size analysis, paleontological statistics and textural analysis were conducted on three piston cores (Core Nos. 3, 7, 9) from the southeastern Yellow Sea of Korea. Two foraminiferal assemblages were defined by cluster analysis. The Cibicides lobatulus-Ammonia ketienziensis assemblage has low P.F/B.F, species diversity and evenness and high number of benthic foram. individuals/20 ml, and is interpreted as representing relict benthic foraminiferal assemblage comprising the upper layer of Core No. 7 and No. 9. The deposit of well sorted alternation layers of muddy sand and sandy mud in Core No. 9. is interpreted as being influenced by hydraulic sorting processes of higher wave and current especially during storm periods. The preservation of 13 Pseudorotalia gaimardii extracted from Core No. 7 confirmed that bed load transport was responsible for its heavily abraded and broken thick-walled tests. The Pseudoparrella naraensis assemblage is a recent benthic foraminiferal assemblage found in the modern homogeneous fine-grained mud facies corresponding to the uppermost part of HMB. It seemed that the apparent sorting phenomena and bed load transport of the benthic foraminifera are the result of turbidity currents which promulgated by rapid tidal currents formed during the last postglacial period in the southeastern Yellow Sea of Korea.

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Section: Foraminiferal Test Featuresmentioning

confidence: 98%

Section: Oceanographic Settingmentioning

confidence: 98%

The effects of depositional processes on benthic foraminiferal taphonomy in the Southeastern Yellow Sea of Korea

2011

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“…Tidal currents exceed 100 cm/s in the Gyunggi Bay and near the southwestern tip of the Korean Peninsula. The large tidal ranges and strong tidal currents along the west coast of Korea produce a complex and dynamic hydraulic regime in terms of sediment erosion and deposition, especially in the nearshore areas (Adams et al, 1990;Alexander et al, 1991;Wells and Park, 1992).…”

Section: Geological and Oceanographic Settingsmentioning

confidence: 99%

“…The southeastern Yellow Sea has a complex and dynamic hydraulic regime in terms of sediment erosion and deposition attributed to eustatic sea-level fluctuations during the late Quaternary glacial cycles, associated with the large tidal ranges and strong tidal currents along the west coast of Korea (Song et al, 1983;Lee and Chough, 1989;Milliman et al, 1989;Adams et al, 1990;Alexander et al, 1991;Wells and Park, 1992;Saito et al, 1998;Chough et al, 2000;Bern e et al, 2002;Wellner and Bartek, 2003;Shinn et al, 2007). Moreover, the numerous locations of sediment input from many rivers in Korea (e.g.…”

Section: Introductionmentioning

confidence: 97%

Stratigraphy of late Quaternary deposits using high resolution seismic profile in the southeastern Yellow Sea

Lee

Kim

Yoo

et al. 2014

Quaternary International

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“…Flow constrained by the channel banks may also have different sediment concentrations than the overlying flow. Lutoclines (sharp gradients in sediment concentration) form when the near-bed region of channels develop much higher sediment concentrations than adjacent mudflat shoals (Wolanski et al, 1988;Adams et al, 1990). As with salinity, sediment stratification changes the mixing regime by suppressing turbulent motions.…”

Section: Introductionmentioning

confidence: 99%

Shear and turbulence production across subtidal channels

Ralston¹,

Stacey²

2006

J Mar Res

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In intertidal regions with subtidal channels, effects of bathymetry on overlying flow vary greatly with tidal stage. Around low water when mudflats and marsh are exposed, flow is constrained to channels, but when water depths are greater, tidal forcing may not necessarily be aligned with meandering channel axes. Flow across the channel can generate strong shear and turbulence at the elevation of the channel banks and can significantly increase turbulent energy in the middle of the water column. Field observations in a mudflat channel of San Francisco Bay indicate that cross-channel shear regularly occurs there early in ebb tides. With increased freshwater flow, baroclinic forcing can enhance shear by decoupling flow between dense water flooding in the channel and fresher water ebbing above the channel banks. A water column numerical model with k-ε turbulence closure is modified to represent the cross-channel shear production. Numerical results with uniform density indicate that turbulence production increases with the angle between the barotropic tidal forcing and the channel axis. When a longitudinal salinity gradient is imposed, cross-channel shear production contributes to breakdown of periodic stratification. Turbulence produced at the channel banks locally exceeds dissipation, and the excess energy is either lost to buoyancy or diffuses vertically to lower energy regions near the surface and near the bed. The balance among shear production, buoyancy production, and diffusion of turbulence depends on the flow angle and the strength of the longitudinal salinity gradient.

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Internal hydraulics of a sediment-stratified channel flow

Cited by 27 publications

References 27 publications

The effects of depositional processes on benthic foraminiferal taphonomy in the Southeastern Yellow Sea of Korea

The effects of depositional processes on benthic foraminiferal taphonomy in the Southeastern Yellow Sea of Korea

Stratigraphy of late Quaternary deposits using high resolution seismic profile in the southeastern Yellow Sea

Shear and turbulence production across subtidal channels

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