A Non-hydrostatic Unstructured-grid Finite-volume Coastal Ocean Model System (fvcom-nh): Development, Validation and Application PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download A Non-hydrostatic Unstructured-grid Finite-volume Coastal Ocean Model System (fvcom-nh): Development, Validation and Application PDF full book. Access full book title A Non-hydrostatic Unstructured-grid Finite-volume Coastal Ocean Model System (fvcom-nh): Development, Validation and Application by Zhigang Lai. Download full books in PDF and EPUB format.
Author: Zhigang Lai
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
Get Book Here
Book Description
Author: Zhigang Lai
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
Get Book Here
Book Description
Author: Changsheng Chen
Publisher:
ISBN:
Category : Nonlinear theories
Languages : en
Pages : 385
Get Book Here
Book Description
Preface: FVCOM is a prognostic, unstructured-grid, Finite-Volume, free-surface, three-dimensional (3-D) primitive equations Community Ocean Model developed originally by Chen et al. (2003a). The current version of FVCOM is fully coupled ice-ocean-wave-sediment-ecosystem model system with options of various turbulence mixing parameterization, generalized terrain-following coordinates, data assimilation schemes, and wet/dry treatments with inclusion of dike and groyne structures under hydrostatic or non-hydrostatic approximation. FVCOM solves the governing equations on Cartesian or spherical coordinates in integral form by computing fluxes between non-overlapping horizontal triangular control volumes. Either mode-split or semi-implicit schemes can be selected. This finite-volume approach combines the best of finite-element methods (FEM) for geometric flexibility and finite-difference methods (FDM) for simple discrete structures and computational efficiency. This numerical approach also provides a much better representation of mass, momentum, salt, and heat conservation in coastal and estuarine regions with complex geometry. The conservative nature of FVCOM in addition to its flexible grid topology and code simplicity make FVCOM ideally suited for interdisciplinary application in the coastal ocean. The initial development of FVCOM was started by a team effort led by C. Chen in 1999 at the University of Georgia (UGA) with support from the Georgia Sea Grant College Program. C. Chen, H. Liu, and R. C. Beardsley developed the first version of FVCOM at designing to simulate the 3-D currents and transport within an estuary/tidal creek/inter-tidal salt marsh complex. The first manuscript about this new model was submitted to Journal of Atmospheric and Oceanic Technology in 2000 and published in 2003. That was the first paper of FVCOM. In 2001, C. Chen moved to the School of Marine Science and Technology at the University of Massachusetts-Dartmouth (SMAST/UMASS-D) and established the Marine Ecosystem Dynamics Modeling (MEDM) Laboratory where work on FVCOM has continued with funding from several sources including the NASA and NOAA-funded SMAST fishery program led by Brian Rothschild, the NSF/NOAA US GLOBEC/Georges Bank Program. Led by C. Chen and R. C. Beardsley (Woods Hole Oceanographic Institution-WHOI), the model development team with members of H. Liu, T. Wang completed the original structure of FVCOM and conducted a series of model validation experiments. G. Cowles joined the MEDM group as postdoctoral researcher in 2003 and lead the conversion of FVCOM to Fortran 90/95, modularized the coding structure, and added the capability for parallel computation. The first FVCOM User Manual was published in 2004 together with a release of FVCOM v2.4. Since then, many new modules were developed by the FVCOM team members including J. Qi, H. Huang, Q. Xu, Z. Lai, P. Xue, D. Stuebe and R. Tian. The second FVCOM User Manual came out in 2006 with a release of FVCOM v2.6. D. Stuebe implemented a new code structure to improve the efficiency of inter-node data exchange and model input and output writing under parallel computational environments, and J. Qi continued to complete his work after he left. D. Stuebe also implemented the visualization software "ViSiT" into FVCOM, which can monitor the model performance during the model run. This new code structure was the origin of FVCOM v3.0 ...
Author: Zhigang Lai
Publisher:
ISBN:
Category : Estuarine oceanography
Languages : en
Pages : 23
Get Book Here
Book Description
The unstructured grid finite volume coastal ocean model (FVCOM) system has been expanded to include nonhydrostatic dynamics. This addition uses the factional step method with both split mode explicit and semi-implicit schemes. The unstructured grid finite volume method, combined with a correction of the final free surface from its intermediate value with inclusion of nonhydrostatic effects, efficiently reduces numerical damping and thus ensures second-order accuracy of the solutions with local/global volume conservation. Numerical experiments have been made to fully validate the nonhydrostatic FVCOM, including surface standing and solitary waves in idealized flat- and sloping-bottomed channels in homogeneous conditions, the density adjustment problem for lock exchange flow in a flat-bottomed channel, and two-layer internal solitary wave breaking on a sloping shelf. The model results agree well with the relevant analytical solutions and laboratory data. These validation experiments demonstrate that the nonhydrostatic FVCOM is capable of resolving complex nonhydrostatic dynamics in coastal and estuarine regions.
Author: Guoping Gao
Publisher:
ISBN:
Category :
Languages : en
Pages : 400
Get Book Here
Book Description
Author:
Publisher: Academic Press
ISBN: 0080878857
Category : Science
Languages : en
Pages : 4604
Get Book Here
Book Description
The study of estuaries and coasts has seen enormous growth in recent years, since changes in these areas have a large effect on the food chain, as well as on the physics and chemistry of the ocean. As the coasts and river banks around the world become more densely populated, the pressure on these ecosystems intensifies, putting a new focus on environmental, socio-economic and policy issues. Written by a team of international expert scientists, under the guidance of Chief Editors Eric Wolanski and Donald McClusky, the Treatise on Estuarine and Coastal Science, Ten Volume Set examines topics in depth, and aims to provide a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Most up-to-date reference for system-based coastal and estuarine science and management, from the inland watershed to the ocean shelf Chief editors have assembled a world-class team of volume editors and contributing authors Approach focuses on the physical, biological, chemistry, ecosystem, human, ecological and economics processes, to show how to best use multidisciplinary science to ensure earth's sustainability Provides a comprehensive scientific resource for all professionals and students in the area of estuarine and coastal science Features up-to-date chapters covering a full range of topics
Author: Haosheng Huang
Publisher:
ISBN:
Category : Nonlinear theories
Languages : en
Pages : 42
Get Book Here
Book Description
Author: Wei Pan
Publisher:
ISBN:
Category :
Languages : en
Pages :
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 35
Get Book Here
Book Description
The General Curvilinear Coastal Ocean Model is a high-resolution, nonhydrostatic model with a fully 3D curvilinear coordinate system. It is an inherently computationally expensive model that requires processing large amounts of data. As a solution, the PETSc library is chosen to implement an efficient parallel scheme. Through the use of the PETSC DMDA objects, communication management of multi-dimensional arrays on an Arakawa-C staggered grid is simplified. This DMDA domain decomposition strategy allows a 3D mesh to be easily divided among processors for improved performance. This parallel model is tested for correctness and performance on three experiments that model different physical conditions. The most notable is the Seamount-Beam test case which requires a longer period of simulation to begin manifesting physical properties, making it the most time-consuming experiment that this thesis aims to resolve. The parallel model also retains the numerical methods and accuracy as the serial version which gives model developers a consistent way to analyze results in faster time. In addition, the performance gain allows the parallel GCCOM to accommodate larger problem sizes, resulting in more detailed simulations.
Author:
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 54
Get Book Here
Book Description
The General Curvilinear Coastal Ocean Model (GCCOM) is unique in its ability to compute estimates of ocean circulation at high resolutions utilizing three-dimensional curvilinear grids. GCCOM has proved successful in simulated settings and is ready for real-world application. This project details such an application in simulating the shallow water hydrodynamics of San Diego Bay, CA. San Diego Bay serves as a conduit for naval operations, commercial shipping, recreational boating, etc. and lends itself well for application of the models three-dimensional curvilinear approach. Specifically, estimates of tidal flow, temperature, salinity, and current velocity at high temporal and spatial scales within the bay are computed. The model is initialized with output from the widely used larger scale Regional Ocean Model System (ROMS). The documentation detailing the methods to create a 3D curvilinear grid ready for use in the GCCOM model is currently non-existent. As such, the goal of this project is to create a roadmap for future GCCOM users to follow in grid creation and establishing the necessary initial conditions to run the model. This is accomplished through the creation of a digital repository complete with requisite code and several grid creation tutorials.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
Get Book Here
Book Description
A three-dimensional hydrostatic finite volume ocean model is developed solving the integral dynamical equations. Since the basic (integral) equations are solved for finite volumes rather than grid points, the flux conservation is easily enforced even on arbitrary meshes. Both upwind and high-order combine compact schemes can be incorporated into the model to increase computational stability and accuracy. For abrupt topography, a terrain-following grid discretization is designed to reduce computational errors such that the four lateral boundaries of each finite volume are perpendicular to x and y axes, and the two vertical boundaries are not purely horizontal. This grid system reveals a superior feature to Cartesian and sigma coordinate systems. The accuracy of this model was tested in this study.
