Model:TreeThrow

Contact

Name	Matthew Kirwan
Type of contact	Model developer
Institute / Organization	USGS, University of Virginia
Postal address 1	Dept. of Environmental Sciences
Postal address 2	PO Box 400123
Town / City	Charlottesville
Postal code	22904
State	Virginia
Country	USA"USA" is not in the list (Afghanistan, Albania, Algeria, Andorra, Angola, Antigua and Barbuda, Argentina, Armenia, Australia, Austria, ...) of allowed values for the "Country" property.
Email address	mkirwan@usgs.gov
Phone	434-924-3186
Fax

Name	Hank Shugart
Type of contact	Model developer
Institute / Organization
Postal address 1
Postal address 2
Town / City
Postal code
State
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Email address
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TreeThrow

Metadata

Summary Also known as Model type Single Model part of larger framework Note on status model Date note status model Technical specs Supported platforms Unix, Linux, Windows Other platform Programming language Fortran77 Other program language Code optimized Single Processor Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 2008 Does model development still take place? Yes If above answer is no, provide end year model development Code development status When did you indicate the 'code development status'? Model availability As executable"As executable" is not in the list (As code, As teaching tool) of allowed values for the "Model availability" property. Source code availability (Or provide future intension) Through owner"Through owner" is not in the list (Through web repository, Through CSDMS repository) of allowed values for the "Source code availability" property. Source web address Source csdms web address Program license type GPL v2 Program license type other Memory requirements -- Typical run time Seconds to minutes In/Output Describe input parameters fraction of trees that move sediment when they die, # of plots to simulate, # of years to simulate, with or without growth of Chestnut. Input format ASCII Other input format Command line Describe output parameters Characteristics of tree growth (stand biomass, stem count, leaf area, diamter) and characteristics of sediment transport (sediment flux in m4/m/yr, # of tree falls) 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 Other visualization software Process Describe processes represented by the model Growth, death, and regeneration of individual trees. Sediment flux moved by each tree. Describe key physical parameters and equations Species specific, logistic growth equation for individual trees. Sediment flux for each tree fall a function of sediment volume, transport distance, and hillslope angle. Sediment volume and transport distance a function of tree diamter. Describe length scale and resolution constraints Zero dimensional model simulating a 1/12 ha plot. Describe time scale and resolution constraints Annual time step, usually simulate ~1000 years. Describe any numerical limitations and issues -- Testing Describe available calibration data sets Requires calibration for relationship between: soil plate volume and tree diameter; soil plate width and tree diameter; soil plate depth and tree diameter. These relationships have been calibrated based on field data in the Southern Blue Ridge (Appalachian Mountains). Upload calibration data sets if available: Describe available test data sets -- Upload test data sets if available: Describe ideal data for testing -- Other Do you have current or future plans for collaborating with other researchers? no, but would like to Is there a manual available? No Upload manual if available: Model website if any None Model forum / discussion board Comments -- TreeThrow Introduction History Papers TreeThrow Questionnaire Contact Information Model: TreeThrow Contact person: Matthew Kirwan (model developer) Institute: USGS, University of Virginia City: Charlottesville, Virginia Country: USA Email: mkirwan@usgs.gov 2nd person involved: Hank Shugart (model developer) 3rd person involved: -- Model description Model type: Single model for the terrestrial domain Description: Plot scale, spatially implicit model of tree throw on hillslopes. We couple an existing forest growth model with a couple simple equations for the transport of sediment caused by tree fall. Technical information Supported platforms: UNIX, Linux, Windows Programming language: Fortran77 Model was developed started from: 2008 and development still takes place To what degree will the model become available: As executable Current license type: GPL v2 Memory requirements: -- Typical run time: seconds to minutes Input / Output description Input parameters: fraction of trees that move sediment when they die, # of plots to simulate, # of years to simulate, with or without growth of Chestnut. Input format: ASCII and command line Output parameters: Characteristics of tree growth (stand biomass, stem count, leaf area, diamter) and characteristics of sediment transport (sediment flux in m4/m/yr, # of tree falls) Output format: ASCII Post-processing software (if needed): no Visualization software (if needed): no Process description Processes represented by model: Growth, death, and regeneration of individual trees. Sediment flux moved by each tree. Key physical parameters & equations: Species specific, logistic growth equation for individual trees. Sediment flux for each tree fall a function of sediment volume, transport distance, and hillslope angle. Sediment volume and transport distance a function of tree diamter. Length scale & resolution constraints: Zero dimensional model simulating a 1/12 ha plot. Time scale & resolution constraints: Annual time step, usually simulate ~1000 years. Numerical limitations and issues: Testing Available calibration data sets: Requires calibration for relationship between: soil plate volume and tree diameter; soil plate width and tree diameter; soil plate depth and tree diameter. These relationships have been calibrated based on field data in the Southern Blue Ridge (Appalachian Mountains). Available test data sets: -- Ideal data for testing: -- User groups Currently or plans for collaborating with: no, but would like to Documentation Key papers of the model: (the tree growth model) Shugart, H.H. and West, D.C. 1977. Development of an Appalachian deciduous forest succesion model and its application to assessment of the impact of the Chestnut Blight. Journal of Environmental Management 5, 161-179. Is there a manual available: no Model website if any: none Additional comments Comments: -- Issues Help Input Files Output Files Download Source