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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The long-term goals of this project are to understand the physical oceanographic circulation processes on continental shelves with emphasis on the mechanisms involved in across-shelf transport. The scientific objectives include the application of numerical circulation models to process studies and to simulations of continental shelf fields, including the nearshore surf zone, to help achieve understanding of the flow dynamics. The numerical experiments are supplemented with analytical studies whenever possible. Overall, considerable progress was made toward these objectives with notable contributions in several areas. Some examples are the following. New results were obtained for downwelling flow fields including information about vertically well-mixed regions nearshore, downwelling fronts, and symmetric instabilities in the bottom boundary layer. Bottom boundary layer flows on the shelf under downwelling conditions were shown in general to be susceptible to the occurrence of symmetric instabilities. Results of studies of instabilities of alongshore currents over plane beaches show the nonlinear evolution of shear instabilities, after initial growth at the wavelength of the most unstable linear mode, into new larger-wavelength, propagating, unsteady disturbances. Results with sand bar topography point to the possible existence in the nearshore surf zone of an energetic eddy field associated with instabilities of the alongshore current.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The long-term goals of this project are to understand the physical oceanographic circulation processes on continental shelves with emphasis on the mechanisms involved in across-shelf transport. The scientific objectives include the application of numerical circulation models to process studies and to simulations of continental shelf fields, including the nearshore surf zone, to help achieve understanding of the flow dynamics. The numerical experiments are supplemented with analytical studies whenever possible. Overall, considerable progress was made toward these objectives with notable contributions in several areas. Some examples are the following. New results were obtained for downwelling flow fields including information about vertically well-mixed regions nearshore, downwelling fronts, and symmetric instabilities in the bottom boundary layer. Bottom boundary layer flows on the shelf under downwelling conditions were shown in general to be susceptible to the occurrence of symmetric instabilities. Results of studies of instabilities of alongshore currents over plane beaches show the nonlinear evolution of shear instabilities, after initial growth at the wavelength of the most unstable linear mode, into new larger-wavelength, propagating, unsteady disturbances. Results with sand bar topography point to the possible existence in the nearshore surf zone of an energetic eddy field associated with instabilities of the alongshore current.
Author: G.T. Csanady
Publisher: Springer Science & Business Media
ISBN: 9401710414
Category : Science
Languages : en
Pages : 293
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Book Description
For some time there has existed an extensive theoretical literature relating to tides on continental shelves and also to the behavior of estuaries. Much less attention was traditionally paid to the dynamics of longer term, larger scale motions (those which are usually described as circulation') over continental shelves or in enclosed shallow seas such as the North American Great Lakes. This is no longer the case: spurred on by other disciplines, notably biological oceanography, and by public concern with the environment, the physical science of the coastal ocean has made giant strides during the last two decades or so. Today, it is probably fair to say that coastal ocean physics has come of age as a deduc tive quantitative science. A well developed body of theoretical models exist, based on the equations of fluid motion, which have been related to observed currents, sea level variations, water properties, etc. Quantitative parameters required in using the models to predict e.g. the effects of wind or of freshwater influx on coastal currents can be estimated within reasonable bounds of error. While much remains to be learned, and many exciting discoveries presumably await us in the future, the time seems appropriate to summarize those aspects of coastal ocean dynamics relevant to 'circulation' or long term motion.
Author: Norman S. Heaps
Publisher: American Geophysical Union
ISBN:
Category : Nature
Languages : en
Pages : 232
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Book Description
Published by the American Geophysical Union as part of the Coastal and Estuarine Sciences, Volume 4. The AGU Monograph Series on Coastal and Estuarine Regimes provides timely summaries and reviews of major process and regional studies, both observational and theoretical, and of theoretical and numerical models. It grew out of an IAPSO/SCOR/ECOR working group initiative several years ago intended to enhance scientific communications on this topic. The series' authors and editors are drawn from the international community. The ultimate goal is to stimulate bringing the theory, observations, and modeling of coastal and estuarine regimes together on the global scale.
Author: David G. Blencoe
Publisher:
ISBN: 9781423525523
Category :
Languages : en
Pages : 85
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Book Description
The development of a coastal ocean circulation model involves many challenges, including the interaction of complex coastline and topography and the prediction of mesoscale oceanographic features. The Innovative Coastal-Ocean Observing Network (ICON) developed a Monterey Bay ocean circulation model to resolve these challenges. This study examines two different ICON model cases. The first ICON model case was forced with the 100 km NOGAPS winds while the other was forced with the 9 km COAMPS winds. The comparison demonstrated that the 9 km COAMPS-forced case produced better resolution of the ocean mesoscale. This was shown through examination of the daily sea surface temperature fields and the daily surface ocean currents. Time series of sea surface temperature showed a strong seasonal cycle. After removal of the seasonal cycle, the existence of mesoscale features was even more dramatic. A case study at Pt. Sur showed the evolution of mesoscale features associated with an upwelling event.
Author: Aike Beckmann
Publisher: World Scientific
ISBN: 1848168241
Category : Science
Languages : en
Pages : 342
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Book Description
This book offers a comprehensive overview of the models and methods employed in the rapidly advancing field of numerical ocean circulation modeling. For those new to the field, concise reviews of the equations of oceanic motion, sub-grid-scale parameterization, and numerical approximation techniques are presented and four specific numerical models, chosen to span the range of current practice, are described in detail. For more advanced users, a suite of model test problems is developed to illustrate the differences among models, and to serve as a first stage in the quantitative evaluation of future algorithms. The extensive list of references makes this book a valuable text for both graduate students and postdoctoral researchers in the marine sciences and in related fields such as meteorology, and climate and coupled biogeochemical modeling.
Author: Miguel S. Solano Cordoba
Publisher:
ISBN:
Category : Computational fluid dynamics
Languages : en
Pages :
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Book Description
This document presents the final dissertation in partial fulfillment of the requirements for the degree of Doctor in Philosophy in Mechanical Engineering for Miguel Solano at The University of Texas at Dallas. The main contribution of this dissertation is the implementation and validation of an operational ocean forecasting system based on the Regional Ocean Modeling System (ROMS). ROMS is a terrain-following, primitive equation ocean model which uses a split-explicit time step to advance the 3D equations with a long (slow) step and the 2D equations with a short (fast) step. Tide filtering techniques for the 2D mode are investigated to reduce the error at the open boundaries and to improve the accuracy of the forecast at the near-shore. The operational system was developed for the Caribbean Coastal Ocean Observing System (CariCOOS), the observing arm of the Caribbean Regional Association encompassing the main island of Puerto Rico and the U.S. Virgin Islands and one of eleven regional Integrated Ocean Observing Systems from NOAA around the U.S. coasts. The operational system runs daily and automatically, downloading ocean variables from various regional products, pre-processing input files, setting up the model and producing a 3-day forecast of ocean currents, water levels, temperature and salinity fields. Boundary conditions are downloaded automatically from various regional products. The wind forcing is provided by NDFD and the tide forcing by OTPS. A particle tracking application has been developed to simulate particle dispersion and the trajectory of passive tracers using the output from the ROMS forecast. Chapter 1 provides a brief overview of the research background and objectives. Chapter 2 discusses important concepts in physical oceanography, with emphasis on coastal and near-shore process. Chapter 3 describes the methodology and a detailed description of the numerical model, while the specific configuration for this work is explained in chapter 4. The results are presented in chapter 5 and the conclusions in chapter 6.
Author: Southern California Coastal Water Research Project
Publisher:
ISBN:
Category : Imperial Beach (Calif.)
Languages : en
Pages : 214
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Book Description
Author: Dano Roelvink
Publisher: World Scientific
ISBN: 9814304263
Category : Science
Languages : en
Pages : 291
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Book Description
Key Features:There is currently no comprehensive textbook on coastal morphology ModelingProcess-based morphodynamic Modeling is rapidly becoming very useful and the authors have strongly contributed to this developmentCoastal morphology Modeling is an essential tool in a world that is facing increasing threats from coastal erosion, climate change and increasing population in coastal areas.
Author: Raj C. Murthy
Publisher: Springer Science & Business Media
ISBN: 1402083270
Category : Science
Languages : en
Pages : 249
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Book Description
Although numerous books have been written on both monitoring and modelling of coastal oceans, there is a practical need for an introductory multi-disciplinary volume to non-specialists in this field. The articles commisioned for this book, organized into four major themes, are written by experts in their disciplines while the text is intended for scientists who do not have extensive training in marine sciences and coastal zone management. As such, the articles in this monograph can be a valuable reference for practicing professionals. The first section introduces the complex physical processes with main emphasis on waste disposal in the coastal ocean. Following this, examples of instrumentation techniques that are commonly used for measuring different properties of oceans are discribed. Coastal and estuarine transport and dispersion modelling is introduced in the next section with examples from different parts of the world. The last section provides an overview of coastal disasters such as tropical cyclones, storm surges and oil spills.
Author: Avijit Gangopadhyay
Publisher: CRC Press
ISBN: 1000539059
Category : Science
Languages : en
Pages : 528
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Book Description
Introduction to Ocean Circulation and Modeling provide basics for physical oceanography covering ocean properties, ocean circulations and their modeling. First part of the book explains concepts of oceanic circulation, geostrophy, Ekman, Sverdrup dynamics, Stommel and Munk problems, two-layer dynamics, stratification, thermal and salt diffusion, vorticity/instability, and so forth. Second part highlights basic implementation framework for ocean models, discussion of different models, and their unique differences from the common framework with basin-scale modeling, regional modeling, and interdisciplinary modeling at different space and time scales. Features: Covers ocean properties, ocean circulations and their modeling. Explains the centrality of a rotating earth and its implications for ocean and atmosphere in a simple manner. Provides basic facts of ocean dynamics. Illustrative diagrams for clear understanding of key concepts. Outlines interdisciplinary and complex models for societal applications. The book aims at Senior Undergraduate Students, Graduate Students and Researchers in Ocean Science and Engineering, Ocean Technology, Physical Oceanography, Ocean Circulation, Ocean Modeling, Dynamical Oceanography and Earth Science.
