Model:Kudryavtsev Model

Kudryavtsev Model

Also known as	Ku Model
Model type	Single
Model part of larger framework
Note on status model
Date note status model

Incorporated models or components:

Spatial dimensions	1D, 1.5D, 2D
Spatial extent	Regional-Scale
Model domain	Terrestrial, Hydrology, Cryosphere
One-line model description	Permafrost Active Layer Thickness Model based on Kudryavtsev's parametrization
Extended model description	Models the temporal and spatial distribution of the active layer thickness and temperature of permafrost soils. The underlying approximation accounts for effects of air temperature, snow cover, vegatation, soil moisture, soil thermal properties to predict temperature at the ground surface and mean active layer thickness.

Keywords:	active layer thickness, permafrost, cryosphere,

Supported platforms	Unix, Linux, Mac OS
Other platform
Programming language	Python
Other program language
Code optimized	Single Processor
Multiple processors implemented
Nr of distributed processors
Nr of shared processors
Start year development	2016
Does model development still take place?	Yes
If above answer is no, provide end year model development
Code development status	Active
When did you indicate the 'code development status'?	2020
Model availability	As code, As teaching tool
Source code availability (Or provide future intension)	Through web repository
Source web address	https://github.com/permamodel
Source csdms web address
Program license type	BSD or MIT X11
Program license type other
Memory requirements	N/A
Typical run time	fast

Describe input parameters	Air Temperature : seasonal range of air temperature Snow parameters: winter-averaged Snow Thickness and Snow Density, thermal conductivity of snow Vegetation parameters: Vegetation height, vegetation thermal conductivity Soil properties: volumetric water content, heat capacity in frozen and thawed state
Input format
Other input format	NetCDF
Describe output parameters	Dampening effects of vegetation and snow on temperature Mean annual active layer thickness Mean annual temperature at the permafrost ground surface
Output format
Other output format	NetCDF
Pre-processing software needed?	No
Describe pre-processing software
Post-processing software needed?	Yes
Describe post-processing software	Visualization of NetCDF files
Visualization software needed?	Yes
If above answer is yes
Other visualization software	Any NetCDF visualization codesPanoply

Describe processes represented by the model	Kudryavtsev's parametrization treats a permafrost environment as a system of individual layers, each with their own thermal properties. Air, snow, vegetation, soil each are separate layers and their thermal (insulatory effects) are quantified from layer thickness, their heat capacity and conductivity.
Describe key physical parameters and equations
Describe length scale and resolution constraints	Solutions are generated for a 1D vertical column. When input data are gridded, maps of 1D vertical columns can be made.
Describe time scale and resolution constraints	yearly
Describe any numerical limitations and issues	analytical solution

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

Do you have current or future plans for collaborating with other researchers?	This model is part of the perma-model project which aims to built flexible cyberinfrastructure for permafrost modeling. Close collaborators include: Elchin Jafarov at Los Alamos National Lab, NM Kevin Schaeffer at National Snow and Ice Data Center, Boulder, CO

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

Comments

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Model info

Authors

Wang

Source code

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See also Model:Frost Model, another model in the Permamodel project.

Featured reference(s)	Open Access Status	Year	Type of Reference	Cited
Sazonova, T. S.; Romanovsky, V. E.; 2003. A model for regional-scale estimation of temporal and spatial variability of active layer thickness and mean annual ground temperatures. Permafrost and Periglacial Processes, 14125–139. 10.1002/ppp.449	closed	2003	module related theory	128
Anisimov, Oleg A.; Shiklomanov, Nikolai I.; Nelson, Frederick E.; 1997. Global warming and active-layer thickness: results from transient general circulation models. Global and Planetary Change, 1561–77. 10.1016/S0921-8181(97)00009-X	closed	1997	module related theory	210