Dynamics of bottom boundary layers in the coastal ocean

2001 ◽  
Vol 110 (5) ◽  
pp. 2666-2666
Author(s):  
John Trowbridge
Keyword(s):  
Boundary Layers ◽  
Coastal Ocean ◽  
Bottom Boundary ◽  
Bottom Boundary Layers

Bottom Boundary Layers

2021 ◽  
Author(s):  
Stephen M. Henderson ◽  
Jeffrey R. Nielson
Keyword(s):  
Boundary Layers ◽  
Bottom Boundary ◽  
Bottom Boundary Layers

scholarly journals NUMERICAL MODELING OF A TURBULENT BOTTOM BOUNDARY LAYER UNDER SOLITARY WAVES ON A SMOOTH SURFACE

2018 ◽  
pp. 26
Author(s):  
Ahmad Sana ◽  
Hitoshi Tanaka
Keyword(s):  
Boundary Layer ◽  
Boundary Layers ◽  
Solitary Waves ◽  
Bottom Boundary Layer ◽  
Stream Velocity ◽  
Bottom Boundary ◽  
Sediment Movement ◽  
Bottom Boundary Layers ◽  
Turbulent Models

A number of studies on bottom boundary layers under sinusoidal and cnoidal waves were carried out in the past owing to the role of bottom shear stress on coastal sediment movement. In recent years, the bottom boundary layers under long waves have attracted considerable attention due to the occurrence of huge tsunamis and corresponding sediment movement. In the present study two-equation turbulent models proposed by Menter(1994) have been applied to a bottom boundary layer under solitary waves. A comparison has been made for cross-stream velocity profile and other turbulence properties in x-direction.

Numerical modeling of larval settlement in turbulent bottom boundary layers

1992 ◽  
Vol 50 (4) ◽  
pp. 611-642 ◽  
Author(s):  
Thomas F. Gross ◽  
Francisco E. Werner ◽  
James E. Eckman
Keyword(s):  
Numerical Modeling ◽  
Boundary Layers ◽  
Larval Settlement ◽  
Bottom Boundary ◽  
Bottom Boundary Layers

scholarly journals Nongeostrophic Baroclinic Instability over Sloping Bathymetry: Buoyant Flow Regime

2020 ◽  
Vol 50 (7) ◽  
pp. 1937-1956
Author(s):  
Lixin Qu ◽  
Robert Hetland
Keyword(s):  
Growth Rate ◽  
Flow Regime ◽  
Boundary Layers ◽  
Baroclinic Instability ◽  
Deep Ocean ◽  
Ocean Bottom ◽  
Coastal Zones ◽  
Buoyant Flow ◽  
Bottom Boundary ◽  
Bottom Boundary Layers

AbstractBaroclinic instabilities are important processes that enhance mixing and dispersion in the ocean. The presence of sloping bathymetry and the nongeostrophic effect influence the formation and evolution of baroclinic instabilities in oceanic bottom boundary layers and in coastal waters. This study explores two nongeostrophic baroclinic instability theories adapted to the scenario with sloping bathymetry and investigates the mechanism of the instability suppression (reduction in growth rate) in the buoyant flow regime. Both the two-layer and continuously stratified models reveal that the suppression is related to a new parameter, slope-relative Burger number Sr ≡ (M2/f2)(α + αp), where M2 is the horizontal buoyancy gradient, α is the bathymetry slope, and αp is the isopycnal slope. In the layer model, the instability growth rate linearly decreases with increasing Sr {the bulk form Sr = [U0/(H0f)](α + αp)}. In the continuously stratified model, the instability suppression intensifies with increasing Sr when the regime shifts from quasigeostrophic to nongeostrophic. The adapted theories are intrinsically applicable to deep ocean bottom boundary layers and could be conditionally applied to coastal buoyancy-driven flow. The slope-relative Burger number is related to the Richardson number by Sr = δrRi−1, where the slope-relative parameter is δr = (α + αp)/αp. Since energetic fronts in coastal zones are often characterized by low Ri, that implies potentially higher values of Sr, which is why baroclinic instabilities may be suppressed in the energetic regions where they would otherwise be expected to be ubiquitous according to the quasigeostrophic theory.

ON COASTAL - OPEN SEA DYNAMIC INTERACTIONS DEFINING PRODUCTIVITY AND ECOLOGY OF SHELF AND ADJACENT TO SHELF WATERS

2017 ◽  
Author(s):  
Vadim Navrotsky ◽  
Vadim Navrotsky
Keyword(s):  
Boundary Layers ◽  
Internal Waves ◽  
Stratified Medium ◽  
Shelf Zone ◽  
Small Scale ◽  
The Sea Of Japan ◽  
Bottom Boundary ◽  
Open Sea ◽  
Bottom Boundary Layers ◽  
Near Shore

It is known that considerable part of living matter in the ocean falls out of biological cycle irretrievably by way of sedimentation. It means that quasi-stationary state of oceanic ecosystems is possible only with supply of mineral and organic matter from land. That supply, which includes also contaminating matter, takes place mainly in near-shore regions, concentrates in bottom boundary layers, and is transferred to the open sea via shelves by means of horizontal and vertical mixing. Effective mixing in shelves is carried out by small-scale processes, which are considerably fed by energy of large-scale processes from out-of-shelf regions. The main objective of our paper is to identify mechanisms of energy transfer from large to small-scale motions and from open sea to near-shore areas. Our experiments and observations in the shelf zone of the Sea of Japan revealed important specific features in stratified bottom boundary layers: 1) Temporal intermittence of internal waves (IW) in near-bottom layers and their transformation into sequences of stratified boluses moving in non-stratified medium. 2) Extremely high horizontal and vertical velocities in the near-bottom layers. 3) Considerable power fluctuations caused by correlated fluctuations of near-bottom pressure and velocity. 4) Non-monotonic vertical structure of temperature and velocity leading to possibility of simultaneous existing of IW breaking and secondary generation of high-frequency IW by turbulence in layers with high curvature of velocity profiles. Taking into account satellite observations of high correlation between chlorophyll-a concentration in coastal and in out-of-shelf waters, as well as dispersion relations for different types of internal waves and results of our field experiments we suggest that interconnection of biological parameters in coastal and in open sea waters is exercised substantially by gravitational and inertial internal waves generated by tides and eddies in the region of continental slope near the shelf boundary.

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