Model:DepthDependentDiffuser

DepthDependentDiffuser

Also known as	Landlab Depth Dependent Linear Diffuser
Model type	Tool
Model part of larger framework	LandLab

Incorporated models or components:

Spatial dimensions	2D
Spatial extent	Landscape-Scale
Model domain	Terrestrial
One-line model description	Soil depth-dependent linear hillslope diffuser
Extended model description	This component implements a depth and slope dependent linear diffusion rule in the style of Johnstone and Hilley (2014). Soil moves with a prescribed exponential vertical velocity profile. Soil flux is dictated by a diffusivity, K, and increases linearly with topographic slope.

Keywords:	soil, hillslope,

Supported platforms
Other platform
Programming language	Python
Other program language
Code optimized
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development	2017
Does model development still take place?	No
If above answer is no, provide end year model development	2019
Code development status	Active
When did you indicate the 'code development status'?	2020
Model availability	As code
Source code availability (Or provide future intension)	Through web repository
Source web address	https://github.com/landlab/landlab/tree/master/landlab/components/depth_dependent_diffusion
Source csdms web address
Program license type	BSD or MIT X11
Program license type other
Memory requirements
Typical run time

Describe input parameters	grid: ModelGrid Landlab ModelGrid object linear_diffusivity: float Hillslope diffusivity, m**2/yr soil_transport_decay_depth: float characteristic transport soil depth, m
Input format
Other input format
Describe output parameters
Output format
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	This component calculates the flux of soil on a hillslope according to a soil depth-dependent linear diffusion rule.
Describe key physical parameters and equations	Soil flux is calculated at the product of diffusivity, a characteristic transport depth, and an exponential velocity profile based on total soil depth.
Describe length scale and resolution constraints
Describe time scale and resolution constraints
Describe any numerical limitations and issues	Explicit solver can go unstable, and it is not always obvious. Make sure to check resulting soil depths in the landscape to look for instabilities.

Describe available calibration data sets
Upload calibration data sets if available:
Describe available test data sets
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Describe ideal data for testing

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

Is there a manual available?	No
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