Model:Auto marsh

Auto marsh

Also known as	auto_marsh
Model type	Single
Model part of larger framework
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Incorporated models or components:

Spatial dimensions	2D
Spatial extent	Landscape-Scale, Watershed-Scale
Model domain	Coastal
One-line model description	Cellula automata model for salt marsh evolution with variable soil resistance under wind waves attack
Extended model description	The model reproduce the effect of a variability in soil resistance on salt marsh erosion by wind waves. The model consists of a two-dimensional square lattice whose elements, i, have randomly distributed resistance, r_i. The critical soil height H_ci for boundary stability is calculated from soil shear strength values and is assumed as representative of soil resistance, as it is a convenient way to take into account general soil and ambient conditions. The erosion rate of each cell, E_i, which represents the erosion of an homogeneous marsh portion, is defined as: E_i=〖αP〗^β exp (-H_ci/H) Where α and β are non-dimensional constants set equal to 0.35 and 1.1 respectively, P is the wave power, and H is the mean wave height. The model follows three rules: i) only neighbors of previously eroded cells can be eroded. Therefore, only cells having at least one side in common with previously eroded elements are susceptible to erosion; ii) at every time step one element is eroded at random with probability p_i=E_i/(∑E_i ); iii) A cell is removed from the domain if it remains isolated from the rest of the boundary (no neighbors).

Keywords:	salt marsh, cellula automata, wind waves, extreme events, ecogemorphology,

Supported platforms	Unix, 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
Code development status
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Model availability	As code, As teaching tool
Source code availability (Or provide future intension)	Through web repository
Source web address	https://github.com/csdms-contrib/Auto_marsh
Source csdms web address
Program license type	GPL v3
Program license type other
Memory requirements
Typical run time

Describe input parameters	wind waves, soil resistance / shear strength
Input format	ASCII
Other input format
Describe output parameters	salt marsh erosion rate, shape of marsh boundary, erosion time, magnitude of erosion events frequency occurrence erosion events of a given magnitude
Output format	ASCII
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
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Describe processes represented by the model	Salt marsh erosion by wind waves. The presence of natural heterogeneities is an integral characteristic of salt marshes and needs to be account for, as local feedbacks could influence the large scale morphodynamic evolution of these wetlands. Herein, we use field data and a cellular automata model to investigate salt marsh response to wave action under different wave energy conditions and frequency of extreme events.
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	Model description and calibration can be found in: Leonardi, N., and S. Fagherazzi (2014), How waves shape salt marshes, Geology , doi:10.1130/G35751.1. Leonardi, N., and S. Fagherazzi (2015), Local variability in erosional resistance affects large scale morphodynamic response of salt marshes to wind waves, Geophysical Research Letters, 2015GL064730, doi:10.1002/2015GL064730.
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Do you have current or future plans for collaborating with other researchers?

Is there a manual available?	No
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Comments	Model description and calibration can be found in: Leonardi, N., and S. Fagherazzi (2014), How waves shape salt marshes, Geology , doi:10.1130/G35751.1. Leonardi, N., and S. Fagherazzi (2015), Local variability in erosional resistance affects large scale morphodynamic response of salt marshes to wind waves, Geophysical Research Letters, 2015GL064730, doi:10.1002/2015GL064730.

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Fagherazzi

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Featured reference(s)	Open Access Status	Year	Type of Reference	Cited
Leonardi, Nicoletta; Fagherazzi, Sergio; 2015. Effect of local variability in erosional resistance on large-scale morphodynamic response of salt marshes to wind waves and extreme events: Resistance Variability Affects Marsh. Geophysical Research Letters, 425872–5879. 10.1002/2015GL064730	· publishedVersion	2015	a module overview describing a module	61
Leonardi, Nicoletta; Fagherazzi, Sergio; 2014. How waves shape salt marshes. Geology, 42887–890. 10.1130/G35751.1	closed	2014	a module overview describing a module	79

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