Model:AR2-sinuosity

AR2-sinuosity

Also known as	Disturbed periodic model for river meanders
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	Terrestrial, Hydrology, Planetary landforms
One-line model description	Generates planforms for single-thread channel using a second-order autoregressive model
Extended model description	This code creates the channel centerline (i.e., the line equidistant between two banks) for a single thread-channel, using a second-order autoregressive model. The code implements a model for random centerlines proposed by Ferguson, R. I. (1976) Disturbed periodic model for river meanders, Earth Surface Processes 1(4), 337-347, doi:10.1002/esp.3290010403. This implementation also includes (1) controls for the node spacing and extent of channels, (2) removal of self-intersecting (cutoff) loops from modeled centerlines, and (3) a wrapper script to sweep model parameter space and generate alternate realizations using different random disturbance series.

Keywords:

Name	Ajay Limaye
Type of contact
Institute / Organization	Department of Environmental Sciences, University of Virginia
Postal address 1	291 McCormick Rd.
Postal address 2
Town / City	Charlottesville
Postal code	22904
State	Virginia
Country	United States
Email address	ajay@virginia.edu
Phone
Fax

Supported platforms	Linux, Mac OS, Windows
Other platform
Programming language	Matlab
Other program language
Code optimized	Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development
Does model development still take place?	No
If above answer is no, provide end year model development	2021
Code development status	Only maintenance
When did you indicate the 'code development status'?	2021
Model availability	As code
Source code availability (Or provide future intension)	Through web repository
Source web address	https://github.com/alimaye/AR2-sinuosity
Source csdms web address
Program license type	GPL v2
Program license type other
Memory requirements	Variable, but minimal for processing any one centerline
Typical run time	Minutes

Describe input parameters	AR2 model parameters, as defined in wrapper script
Input format
Other input format
Describe output parameters	Channel centerlines and associated model parameters
Output format
Other output format	MATLAB .mat file
Pre-processing software needed?	No
Describe pre-processing software
Post-processing software needed?	No
Describe post-processing software
Visualization software needed?	Yes
If above answer is yes	Matlab
Other visualization software

Describe processes represented by the model	Channel planform geometry
Describe key physical parameters and equations	The geometry of a channel centerline is represented as a direction series using a second-order autoregressive formulation. The governing equation is theta(i) = b_1theta(i-1) + b_2theta(i-2) + epsilon(i) where theta is the channel direction, i is the centerline node index, b_1 and b_2 are coefficients, and epsilon is a random disturbance drawn from a normal distribution with a mean of zero.
Describe length scale and resolution constraints	The channel is represented by a set of linked nodes. There are no intrinsic constrains for length scale or resolution.
Describe time scale and resolution constraints	Not applicable - the model generates static channel planforms.
Describe any numerical limitations and issues	Some parameter values result in channels that self-intersect. The code outputs both the raw centerline and a simplified centerline with self-intersections removed.

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	Examples of model output are available in the following data repository: Limaye, A. B., 2021, Sinuosity data for numerically modeled and natural channels, University of Virginia Dataverse, https://doi.org/10.18130/V3/TRTTIS.

Do you have current or future plans for collaborating with other researchers?

Is there a manual available?	No
Upload manual if available:
Model website if any
Model forum / discussion board

Comments

This part will be filled out by CSDMS staff

OpenMI compliant	Not yet"Not yet" is not in the list (Yes, No but planned, No but possible, No not possible) of allowed values for the "Code openmi compliant or not" property.
BMI compliant	Not yet"Not yet" is not in the list (Yes, No but planned, No but possible, No not possible) of allowed values for the "BMICompliant" property.
WMT component	Not yet"Not yet" is not in the list (Yes, In progress, No but possible, No not possible) of allowed values for the "Code CMT compliant or not" property.
PyMT component	Not yet"Not yet" is not in the list (Yes, In progress, No but possible, No not possible) of allowed values for the "Code PyMT compliant or not" property.
Is this a data component	No

Can be coupled with:

Model info

Authors

Ajay Limaye

Source code

Model citations

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Featured reference(s)	Open Access Status	Year	Type of Reference	Cited
Limaye, Ajay B.; Lazarus, Eli D.; Li, Yuan; Schwenk, Jon; 2021. River sinuosity describes a continuum between randomness and ordered growth. Geology, 491506–1510. 10.1130/G49153.1	cc-by · publishedVersion	2021	a module overview describing a module	14