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From CSDMS
No but planned +
No but possible +
No but possible +
Single Processor +
Creation date"Creation date" is a predefined property that corresponds to the date of the first revision of a subject and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
19:39:39, 21 January 2011 +
https://csdms.colorado.edu/pub/models/doi-source-code/mrip-10.1594.IEDA.100149-0.1.tar.gz +
The model has been compared qualitatively with Clarke and Werner (2004), Gallagher et al 1998, 2003 and 2005 and various Hay papers. +
Basic parameters for a sediment transport … Basic parameters for a sediment transport model (grain size, efficiency coefficients, coefficient of friction, wave friction factor, density, etc) most are in there using values from the literature, but easily modified.</br></br>Flow. (Sinusoidal, steady or combined flows can be created, as well as natural flow data can be used.)</br>A random "turbulent" flow is imposed - this needs a magnitude.</br>Jump fraction - given distance sediment moves with flow - given distance sediment moves with flow +
"Key" parameters:
*the transport threshold … "Key" parameters:</br>*the transport thresholds (if you use the simple rules) (it is cool, model results are similar with all the transport models that have been tested)</br>*the flow magnitudes and turbulence magnitude</br>*Jump_frac</br>*all the little parameters in the transport equations</br></br>Most parameters act to speed or slow transport, which in turn speeds or slows the growth of bedforms.rn speeds or slows the growth of bedforms. +
With Matlab running on my desktop PC I get … With Matlab running on my desktop PC I get out of memory errors when I make the domain much bigger than it is at present (250x250). I am working to expand the model domain. I would also like to increase the resolution. (Isn't this what all modelers want to do?)(Isn't this what all modelers want to do?) +
Options (can be turned on or off):
Print e … Options (can be turned on or off):</br>Print evolving bed to screen.</br>A file with the bed with each time step, or at intermediate steps.</br>A file with the spectra of bed at each time step, or at intermediate steps.</br>A file with statistics (eg, rms roughness of bed)with statistics (eg, rms roughness of bed) +
The bed is represented by a 2-D matrix. At … The bed is represented by a 2-D matrix. At this time the bed is 250 x 250. Each block (i,j) is taken to be a slab of sediment 10cm x 10cm x 1cm deep. </br></br>A second matrix represents the flow. This is the same everywhere in the domain at each time point, except for a random spatial fluctuation representing turbulence.</br></br>The user-defined flow picks up (or puts down) sediment according to a transport law. Three transport laws have been tested: Bailard (1981), Ribberink (1998) or simple rules. The simple rules are simply thresholds: (if flow greater than 70cm/sec pick up one block).</br></br>Once sand block have been picked up, they are moved forward with the flow. Generally, I have used a fraction of the distance that the water would travel (jump_frac). So, with a flow of 100cm/sec, in one second that water goes 100 cm. The sand in this case would go 50 cm (half the distance). At the extremes, the model is sensitive to this parameter, but at intermediate values, it is not.</br></br>Tested flows have consisted of combined sinusoidal flow+steady flow, purely osc, purely steady, and natural flow time series taken from current meter measurements. All flows have a random spatial fluctuation added at each time point. </br></br>Once bedforms are generated, feedback rules are employed by altering the flow over the bedform. Once a bedform gets tall, the flow over the top accelerates, increasing transport at that location. In the steep lee of a bedform, a shadow zone forms where flow goes to ~zero, therefore transport goes to zero. These mechanisms destroy or build bedforms.hese mechanisms destroy or build bedforms. +
One second has been the time resolution. I haven't played with this. +
2,011 +
Mrip consists of a matrix representing the … Mrip consists of a matrix representing the sea floor (25x25 m at this time). Blocks in the matrix are picked up (or deposited) according to transport rules or equations (users choice) and moved with the flow. The user-determined flow is altered, depending on the height and slope of the bed, thus creating feedback. slope of the bed, thus creating feedback. +
Edith +
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ASCII +
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0 +
As code +
Single +
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02:13:46, 17 September 2020 +
1 +
Mrip is a self-organization type model for the formation and dynamics of megaripples in the nearshore. +
ASCII +
Matlab files +
PO Box 3003 +
17604-3003 +
false +
false +
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GPL v2 +
Matlab +
~1 hr (depending on duration of simulation) +
Through CSDMS repository +
https://github.com/csdms-contrib/mrip +
2003 +
Windows +
Model developer +
