Model:Cross Shore Sediment Flux

Cross Shore Sediment Flux

Also known as
Model type	Single
Model part of larger framework
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Spatial dimensions	1D
Spatial extent	Landscape-Scale
Model domain	Coastal
One-line model description	Cross-Shore Sediment Flux Equations
Extended model description	The Cross-Shore Sediment Flux model addresses predominately sandy, wave-dominated coastlines on time-scales ranging from years to millenia and on spatial scales ranging from kilometers to tens of kilometers using a range of wave parameters as inputs. It calculates the cross-shore sediment flux using both shallow water wave assumptions and full Linear Airy wave Theory. An equilibrium profile is also created. Using the Exner equation, we develop an advection diffusion equation that describes the evolution of profile through time. A morphodynamic depth of closure can be estimated for each input wave parameter.

Keywords:	coastal sediment transport, coastal evolution,

Name	Alejandra Ortiz
Type of contact	Model developer
Institute / Organization	Woods Hole Oceanographic Institution
Postal address 1
Postal address 2
Town / City	Woods Hole
Postal code	02543
State	Massachusetts
Country	United States
Email address	aortiz@whoi.edu
Phone
Fax

Supported platforms	Linux, Mac OS, Windows
Other platform
Programming language	Matlab
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Code optimized	Single Processor
Multiple processors implemented
Nr of distributed processors
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Start year development
Does model development still take place?	No
If above answer is no, provide end year model development
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Model availability	As code
Source code availability (Or provide future intension)	Through CSDMS repository
Source web address
Source csdms web address	https://github.com/csdms-contrib/Cross_Shore_Sediment_Flux
Program license type	GPL v2
Program license type other
Memory requirements
Typical run time

Describe input parameters	You can vary the initial slope, wave periods, wave heights, and sediment fall velocity (a proxy for sediment size).
Input format
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Describe output parameters	It outputs all the variables used in the advection-diffusion equation describing bed evolution for both shallow water wave assumptions (all labeled as _s) and linear theory (labeled as _lh).
Output format
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Pre-processing software needed?	No
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Post-processing software needed?	No
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Visualization software needed?	No
If above answer is yes
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Describe processes represented by the model	Using energetics-based formulations for wave-driven sediment transport, we develop a robust methodology for estimating the morphodynamic evolution of a cross-shore sandy coastal profile. The wave-driven cross-shore sediment flux depends on three components: two onshore-directed terms (wave asymmetry and wave streaming) and an offshore-directed slope term. The cross-shore sediment transport formulation defines a dynamic equilibrium profile and, by perturbing about this steady-state profile, we present an advection-diffusion formula for profile evolution. Morphodynamic Péclet analysis suggests that the shoreface is diffusionally dominated. Using this depth-dependent characteristic diffusivity timescale, we distinguish a morphodynamic depth of closure for a given time envelope. Even though wave-driven sediment transport can (and will) occur at deeper depths, the rate of morphologic bed changes in response to shoreline change becomes increasingly slow below this morphodynamic closure depth.
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Is there a manual available?	No
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Featured reference(s)	Open Access Status	Year	Type of Reference	Cited
Ortiz, Alejandra C.; Ashton, Andrew D.; 2016. Exploring shoreface dynamics and a mechanistic explanation for a morphodynamic depth of closure: Morphodynamic Depth of Closure. Journal of Geophysical Research: Earth Surface, 121442–464. 10.1002/2015JF003699	· publishedVersion	2016	a module overview describing a module	69