Model:AlluvStrat

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AlluvStrat

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Model type Single Model part of larger framework Note on status model Date note status model Incorporated models or components: Spatial dimensions 2D Spatial extent Landscape-Scale, Watershed-Scale, Reach-Scale Model domain One-line model description Rules-based model to generate a 2-dimensional cross section of alluvial stratigraphy based on fluvial processes Extended model description Generates alluvial stratigraphy by channel migration and avulsion. Channel migration is handled via a random walk. Avulsions occur when the channel superelevates. Channels can create levees. Post-avulsion channel locations chosen at random, or based on topography. Keywords: stratigraphy, fluvial, Name Andy Wickert Type of contact Model developer Institute / Organization University of Colorado Postal address 1 UCB 450 Postal address 2 1560 30th St Town / City Boulder Postal code 80303 State Colorado Country USA"USA" is not in the list (Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, ...) of allowed values for the "Country" property. Email address wickert@colorado.edu Phone Fax Supported platforms Linux Other platform Probably works on all, but is untested Programming language Python Other program language Code optimized Single Processor Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 2011 Does model development still take place? Yes If above answer is no, provide end year model development Code development status When did you indicate the 'code development status'? Model availability As code Source code availability (Or provide future intension) Through web repository, Through CSDMS repository Source web address https://github.com/awickert/alluvstrat Source csdms web address Program license type GPL v2 Program license type other Memory requirements ? Typical run time seconds to minutes Describe input parameters Input file: channel width and depth, a few others Input format ASCII Other input format Describe output parameters Numpy array of channel and overbank deposit Output format Binary Other output format Pre-processing software needed? No Describe pre-processing software Post-processing software needed? No Describe post-processing software Visualization software needed? No If above answer is yes Other visualization software Describe processes represented by the model Channel migration and avulsion building stratigrpahy Describe key physical parameters and equations Describe length scale and resolution constraints Describe time scale and resolution constraints Describe any numerical limitations and issues Describe available calibration data sets Upload calibration data sets if available: Describe available test data sets Upload test data sets if available: Describe ideal data for testing Subsurface data that comprise channel and overbank deposits in a setting where avulsion magnitudes and frequencies and channel migration rates are known Do you have current or future plans for collaborating with other researchers? Yep! Working on it. Is there a manual available? No Upload manual if available: Model website if any Model forum / discussion board Comments Barely started; using this as a testbed for the new CSDMS BMI interface. This part will be filled out by CSDMS staff OpenMI compliant No not possible BMI compliant No not possible WMT component In progress PyMT component Is this a data component DOI model 10.1594/IEDA/100088 For model version 0.1 Year version submitted 2012 Link to file Can be coupled with:

Model info Authors Andy Wickert Source code DOI Download AlluvStrat [ version: 0.1] Doi: 10.1594/IEDA/100088 Model citations Nr. of publications: 1 Total citations: 0 h-index: --"--" is not a number. m-quotient: 0 QR-code Link to this page Other models by author AlluvStrat GFlex IceFlow NEXRAD-extract Terrapin

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<pbars ytitle=Downloads Title='Monthly Downloads alluvstrat' xlabels=true size=900x200 ymax=20 grid=true box=true cubic=true plots=open xformat=number connected=true angle=90 legend> ,Total downloads: 52 2008 - Jan,0 Feb,0 Mar,0 Apr,0 May,0 Jun,0 Jul,0 Aug,0 Sep,0 Oct,0 Nov,0 Dec,0 2009 - Jan,0 Feb,0 Mar,0 Apr,0 May,0 Jun,0 Jul,0 Aug,0 Sep,0 Oct,0 Nov,0 Dec,0 2010 - Jan,0 Feb,0 Mar,0 Apr,0 May,0 Jun,0 Jul,0 Aug,0 Sep,0 Oct,0 Nov,0 Dec,0 2011 - Jan,0 Feb,0 Mar,0 Apr,0 May,0 Jun,0 Jul,0 Aug,0 Sep,0 Oct,0 Nov,0 Dec,0 2012 - Jan,0 Feb,0 Mar,1 Apr,1 May,0 Jun,1 Jul,1 Aug,1 Sep,0 Oct,2 Nov,2 Dec,4 2013 - Jan,5 Feb,6 Mar,1 Apr,4 May,0 Jun,0 Jul,0 Aug,1 Sep,1 Oct,2 Nov,0 Dec,1 2014 - Jan,2 Feb,3 Mar,3 Apr,2 May,2 Jun,1 Jul,0 Aug,0 Sep,1 Oct,2 Nov,1 Dec,1 2015 - Jan,0 Feb,0 Mar,0 Apr,0 May,0 Jun,0 Jul,0 </pbars>

Introduction

AlluvStrat is a simple rules-based model that generates fluvial stratigraphy based on channel width and depth, channel migration rate, channel aggradation rate, and an exponential decay constant for levee growth. Channels move directly by lateral migration, or by avulsion once they aggrade a full channel depth (i.e. superelevation = 1). The channels build overbank materials to their sides, and erode overbank materials where they pass through them.

The current boundary conditions force channel positions that would pass through a periodic boundary condition to remain stuck to the domain boundaries; I am curious as to whether or not this matches observations from physical experiments.

References

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Source code

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Overview and general

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Applications

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Related theory and data

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Input Files

A single plain text file in the directory, called "input", provides parameters for the model. The contents of this file are pasted here:

; Input file for fluvial stratigraphy code (ADW, 27 DEC)

[grid]
dz = 0.1 ; vertical cell size [m]
dy = 1 ; lateral cell size [m]
B = 2001 ; domain width [m]

[time]
dt = 1 ; time step size [yr]
nt = 10000 ; total time steps for model run [--]

[channel]
b = 201 ; meters, must be odd and multiple of dx
h = 5 ; meters
eta = 0 ; Starting bed elevation; should probably stay at zero
etadot_ch = 0.01 ; aggradation rate [m/yr]
zetadot = 1 ; lateral migration rate [m/yr]

[overbank]
; Should include options of different overbank aggradation schemes
etadot_ob_xstar = 200 ; [m] levee exponential decay constant

Output Files

Plots

The following are plots of some example output. Relevant parameters are listed in the plots:

• [math]\displaystyle{ b }[/math]: Channel width
• [math]\displaystyle{ h }[/math]: Channel depth
• [math]\displaystyle{ \dot{\eta}_{ch} }[/math]: In-channel aggradation rate
• [math]\displaystyle{ \dot{\zeta} }[/math]: Channel lateral migration rate
• [math]\displaystyle{ x^*_{\dot{\eta}_{ob}} }[/math]: Floodplain levee height exponential decay length

All of these simulations were run for 10,000 years on a 2001 meter wide domain. Due to the boundary conditions of the current version of the model (trunk on 08 April 2013), there is some clustering of channel bodies around the edges.

Data

The program does not yet save the output grid. We'll have to update the code, or you can run it in an interactive session like ipython and then save the output.