Model help:CEM: Difference between revisions
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Although a number of wave (and geometry) parameters can be entered, the most vital input control for CEM is the wave climate. The current version of the CEM is driven by simplified directional wave climate controlled by two main input parameters: the asymmetry of the incoming waves angle and the proportion of high-angle waves. This model is not designed to accurately simulate a specific geographic location in detail but rather to more generally represent how a shoreline with highly mobile sediment may respond to varying wave angles. The value in this model is in the breadth it offers in representing how different wave climates can result in different potentially interesting shoreline configurations. Ashton and Murray (2006b) present a more thorough description of the model parameters and theoretical underpinning. | Although a number of wave (and geometry) parameters can be entered, the most vital input control for CEM is the wave climate. The current version of the CEM is driven by simplified directional wave climate controlled by two main input parameters: the asymmetry of the incoming waves angle and the proportion of high-angle waves. This model is not designed to accurately simulate a specific geographic location in detail but rather to more generally represent how a shoreline with highly mobile sediment may respond to varying wave angles. The value in this model is in the breadth it offers in representing how different wave climates can result in different potentially interesting shoreline configurations. Ashton and Murray (2006b) present a more thorough description of the model parameters and theoretical underpinning. | ||
==Model input | ==Model parameters== | ||
{| | CEM does not need input files from the user, its input is entirely specified in the CMT graphical user interface. | ||
= Input Files and directories = | |||
{|{{Prettytable}} class = "wikitable unsortable" cellspacing="0" cellpadding="0" style="margin:0em 0em 0em 0;" | |||
|- | |||
!Parameter!!Description!!Unit | |||
|- | |||
|width="20%"| Site prefix | |||
|width="60%"| Part of the input and output file name e.g. the name of the location, or project | |||
|width="20%"| [-] | |||
|- | |||
| Case prefix | |||
| Part of the input and output file name that provides you the opportunity to do different scenario simulations for e.g. the same location, or project | |||
| [-] | |||
|} | |||
= Run Parameters = | |||
{|{{Prettytable}} class = "wikitable unsortable" cellspacing="0" cellpadding="0" style="margin:0em 0em 0em 0;" | |||
|- | |||
!Parameter!!Description!!Unit | |||
|- | |||
|width="20%"| Run duration | |||
|width="60%"| Number of simulation time steps | |||
|width="20%"| [days] | |||
|- | |||
| Shoreface slope | |||
| Longitudinal Slope of the Shoreface | |||
| [-] | |||
|- | |||
| Shoreface depth | |||
| Critical threshold depth defining the shoreface | |||
| [m] | |||
|- | |||
| Shelf slope | |||
| Longitudinal Slope of the Shelf | |||
| [-] | |||
|- | |||
|} | |||
= Grid = | |||
{|{{Prettytable}} class = "wikitable unsortable" cellspacing="0" cellpadding="0" style="margin:0em 0em 0em 0;" | |||
|- | |||
!Parameter!!Description!!Unit | |||
|- | |||
|width="20%"| Number of grid rows | |||
|width="60%"| | |||
|width="20%"| [-] | |||
|- | |||
| Number of grid columns | |||
| | |||
| [-] | |||
|- | |||
| Spacing of grid rows | |||
| | |||
| [m] | |||
|- | |||
| Spacing of grid columns | |||
| | |||
| [-] | |||
|- | |||
|} | |||
= Output Grids = | |||
{| | {|{{Prettytable}} class = "wikitable unsortable" cellspacing="0" cellpadding="0" style="margin:0em 0em 0em 0;" | ||
|- | |- | ||
!Parameter!!Description!!Unit | |||
|- | |- | ||
| | |width="20%"| Output directory | ||
|= | |width="60%"| | ||
|[ | |width="20%"| [-] | ||
|- | |- | ||
| | | Interval between output files | ||
| | | | ||
|[-] | | [-] | ||
|- | |||
| Depth file | |||
| | |||
| [-] | |||
|- | |||
| Percent_filled file | |||
| | |||
| [-] | |||
|- | |- | ||
|} | |} | ||
<headertabs/> | |||
== Model output parameters == | == Model output parameters == |
Revision as of 18:14, 31 October 2010
Model output parameters
In the CEM modules these are specified under the Output Grids tab. You can specify how often you want output to be written; files will be really large if you choose to save every timestep. Use the 'ON' toggle to specify whether you want outfiles to be written or not. The files will be grid-stacks in NetCDF format.
DEPTH | = evolving land and ocean bottom grid | [meters] |
PERCENT-FILLED | = records the fill of the individual cells for the entire grid | [%] |
Coupling parameters
Uses ports
This will be something that the CSDMS facility will add
Provides ports
This will be something that the CSDMS facility will add
Main equations
A list of the key equations. Discuss the numerical scheme, if you deem this important. HTML format is supported; latex format will be supported in the future
Notes
Any notes, comments, you want to share with the user
Examples
An example run with input parameters as well as a figure / movie of the output
Follow the next steps to include images / movies of simulations:
- Upload file: http://csdms.colorado.edu/wiki/Special:Upload
- Create link to the file on your page: [[Image:<file name>]].
See also: Help:Images or Help:Movies
Developer(s)
Andrew Ashton
References
Ashton A., Murray B.A. Arnault O. Formation of Coastline Features by Large-Scale Instabilities Induced by High-Angle Waves. Nature Magazine. Volume 414. 15 November 2001
Ashton A.D., Murray A.B. High-Angle Wave Instability and Emergent Shoreline Shapes: 1. Wave Climate Analysis and Comparisons to Nature. Journal of Geophysical Research. Volume 111. 15 December 2006.
Ashton A.D., Murray A.B. High-Angle Wave Instability and Emergent Shoreline Shapes: 2. Wave Climate Analysis and Comparisons to Nature. Journal of Geophysical Research. Volume 111. 15 December 2006.
Links
Movies generated with the stand-alone CEM model are documented in the CSDMS movie gallery. http://csdms.colorado.edu/wiki/Coastal_animations