Model:TreeThrow
From CSDMS
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:
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: | -- |
