Continental Shelf Bottom Boundary Layer Model PDF Download
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Author: William D. Grant
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 163
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Author: William D. Grant
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 163
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Author: Richard Brent Styles
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ISBN:
Category :
Languages : en
Pages : 522
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Author:
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Category :
Languages : en
Pages :
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Submitted in partial fulfillment of the requirements for the degree of Doctor of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution January 1983.
Author: Scott Michael Glenn
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 246
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Author:
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Category :
Languages : en
Pages : 4
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The primary objective of this project was to examine the nature of wind-driven upwelling and downwelling along a 2-dim shelf with sloping bottom topography. The approach was to use the Semi-spectral Primitive Equation Model (SPEM) developed by D. Haidvogel and coworkers as the basic circulation model, and conduct a series of idealized model runs to investigate the influence of bottom slope, surface windstress and heat flux, and mixing on the surface and bottom boundary layers which form during the initial stages of up/downwelling. The advanced turbulent closure schemes of Mellor and Yamada were added to our version of SPEM and the model studies were conducted. These studies showed that an asymmetry develops in the bottom boundary layer thickness depending of if the flow is up or downwelling, and that if the coast is shallow enough, that the surface and bottom boundary layers can merge near the coast. Two AGU abstracts were presented and several talks were given on this work. A paper co-authored with A. Herman on the technical aspects of the vertical model resolution was also published.
Author: Malcolm L. Spaulding
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Category : Ocean engineering
Languages : en
Pages :
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Author: Wenxia Zhang
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Category :
Languages : en
Pages :
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The bottom boundary layer is an unstratified thin layer above the sea floor, separated from the more strongly stratified interior. Formation of a thin bottom boundary layer in the presence of stratification and a sloping bottom is common, and well characterized by theory. This thin layer is an important source of mixing over the continental shelf, and it plays a fundamental role in several continental shelf physical and biogeochemical processes, such as buoyancy advection, bottom material transport and hypoxia formation. In this research, Both observations and numerical models are used to study models' ability of reproducing observed stratification and bottom boundary layer dynamics over the Texas-Louisiana shelf. Simulated vertical stratification, which is also representing the vertical density structure, was first evaluated since it directly controls the bottom boundary layer structure itself and is important for other bottom boundary layer dynamics. A new metric, the histogram of vertical stratification, is introduced in this research to evaluate the models' ability of reproducing observed stratification in a bulk sense. The improvement in model performance is attributed to the finer horizontal and temporal resolutions of a model, while factors like open boundary conditions and vertical resolutions are modified without any improvement in the ability of the model to simulate observed stratification. Towed, undulating CTD profiles collected during Mechanisms Controlling Hypoxia (MCH) program also detected mid-water oxygen minima in many transects. These intrusions are connected with the bottom boundary layer and follows the pycnocline seaward as a mid-water column tongue of low oxygen. We calculate convergence within the bottom boundary layer relative to density surfaces using the simulated results; there is a convergence in the bottom boundary layer at the location where the pycnocline intercepts the bottom, creating an injection of bottom boundary layer water into the pycnocline. Convergent flow at the bottom, relative to isopycnal surfaces, is strongest in the density classes associated with the oxygen minimum layer. We believe these mid-water oxygen minima are actually intrusions of low oxygen protruding from the bottom boundary layer via buoyancy advection driven convergence, following the main pycnocline. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155027
Author: William J. Shaw
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ISBN:
Category : Continental shelf
Languages : en
Pages : 376
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The bottom boundary layer is an important dynamical region of shallow water flows. In this thesis, the problem of turbulent mixing in the coastal bottom boundary layer is investigated with a unique set of field measurements of velocity and sound speed that span a significant fraction of the boundary layer obtained over a six-week long period in the late summer of 1996 on the New England shelf. The energetics of the turbulent fluctuations are investigated by testing simplified budgets for turbulent kinetic energy and scalar variance. The turbulent kinetic energy budget is locally balanced while the scalar variance budget is not, probably due to turbulent diffusion. The direct effects of stratification are consistently significant only in the outer part of the boundary layer, where the flux Richardson number is approximately equal to a critical value of 0.2. Turbulence closure is investigated in terms of non-dimensional profiles of velocity and sound speed. Close to the bottom, the results are consistent with Monin-Obukhov similarity theory, while in the outer part of the boundary layer other scales including the height of the boundary layer are important for setting the turbulent length scale.
Author:
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ISBN:
Category :
Languages : en
Pages : 171
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Author: Barry M. Lesht
Publisher:
ISBN:
Category : Continental shelf
Languages : en
Pages : 502
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