Model:VIC

Contact

Name	Dennis Lettenmaier
Type of contact	Technical contact
Institute / Organization
Postal address 1	Dept. of Civil and Env. Engineering
Postal address 2	University of Washington, Box 352700
Town / City	Seattle
Postal code	98195-2700
State	Washington
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	vicadmin@hydro.washington.edu
Phone	206.685.1796
Fax

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VIC

Metadata

Summary Also known as Model type Single Model part of larger framework Note on status model Date note status model global, Technical specs Supported platforms Unix, Linux Other platform Programming language Other program language Code optimized Single Processor Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 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 code Source code availability (Or provide future intension) Through web repository Source web address http://www.hydro.washington.edu/Lettenmaier/Models/VIC/Development/BetaTesting.shtml Source csdms web address Program license type Other Program license type other Memory requirements Typical run time In/Output Describe input parameters Global Parameter File user_def.h File Meteorological Forcing Files Soil Parameter File Vegetation Library File Vegetation Parameter File (Optional) Initial State File (Optional) Elevation Band File (Optional) Lake/Wetland Parameter File Input format Other input format http://www.hydro.washington.edu/Lettenmaier/Models/VIC/Documentation/Inputs.shtml Describe output parameters http://www.hydro.washington.edu/Lettenmaier/Models/VIC/Documentation/Inputs.shtml Output format ASCII, Binary Other output format http://www.hydro.washington.edu/Lettenmaier/Models/VIC/Documentation/OutputVarList.shtml Pre-processing software needed? Yes Describe pre-processing software Post-processing software needed? Yes Describe post-processing software http://www.hydro.washington.edu/Lettenmaier/Models/VIC/Documentation/PostProcessing.shtml Visualization software needed? No If above answer is yes Other visualization software Process Describe processes represented by the model Land Cover and Soil Snow Model Meteorology (Inputs, Distributed Precip, and Snow/Elevation Bands) Frozen Soil (including Permafrost) Dynamic Lake/Wetland Model (new to 4.1.1) Flow Routing Describe key physical parameters and equations Land Cover can subdivide each grid cell's land cover into arbitrary number of "tiles", each corresponding to the fraction of the cell covered by that particular land cover (e.g. coniferous evergreen forest, grassland, etc.) geographic locations or configurations of land cover types are not considered; VIC lumps all patches of same cover type into 1 tile Snow Model VIC considers snow in several forms: ground snow pack, snow in the vegetation canopy, and snow on top of lake ice. Main features: Ground snow pack is quasi 2-layer; the topmost portion of the pack is considered separately for solving energy balance at pack surface Meteorological Input Data Can use sub-daily met data (prcp, tair, wind) at intervals matching simulation time step Can use daily met data (prcp, tmax, tmin, wind) for daily or sub-daily simulations Disaggregates daily met data to sub-daily via Thornton & Running algorithm and others (computes incoming sw and lw rad, pressure, density, vp) VIC can consider spatial heterogeneity in precipitation, arising from either storm fronts/local convection or topographic heterogeneity. Here we consider the influence of storm fronts and local convective activity. This functionality is controlled by the DIST_PRCP option in the global parameter file. Main features: Can subdivide the grid cell into a time-varying wet fraction (where precipitation falls) and dry fraction (where no precipitation falls). The wet fraction depends on the intensity of the precipitation; the user can control this function. Fluxes and storages from the wet and dry fractions are averaged together (weighted by area fraction) to give grid-cell average for writing to output files. Elevation Bands VIC can consider spatial heterogeneity in precipitation, arising from either storm fronts/local convection or topographic heterogeneity. Here we consider the influence of topography, via elevation bands. This is primarily used to produce more accurate estimates of mountain snow pack. This functionality is controlled by the SNOW_BAND option in the global parameter file. Main features: Can subdivide the grid cell into arbitrary number of elevation bands, to account for variation of topography within cell Within each band, meteorologic forcings are lapsed from grid cell average elevation to band's elevation Geographic locations or configurations of elevation bands are not considered; VIC lumps all areas of same elevation range into 1 band Fluxes and storages from the bands are averaged together (weighted by area fraction) to give grid-cell average for writing to output files However, the band-specific values of some variables can be written separately in the output files Liang et al. (1999): set QUICK_FLUX to TRUE in global parameter file; this is the default for FULL_ENERGY = TRUE and FROZEN_SOIL = FALSE. Cherkauer et al. (1999): set QUICK_FLUX to FALSE in global parameter file; this is the default for FROZEN_SOIL = TRUE. By default, the finite difference formulation is an explicit method. By default, the nodes of the finite difference formulation are spaced linearly. These apply to the case QUICK_FLUX = FALSE and FROZEN_SOIL = TRUE, i.e. the formulation of Cherkauer et al. (1999). Describe length scale and resolution constraints Describe time scale and resolution constraints Describe any numerical limitations and issues Testing 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 http://www.hydro.washington.edu/Lettenmaier/Models/VIC/Development/BetaTesting.shtml Other Do you have current or future plans for collaborating with other researchers? https://mailman2.u.washington.edu/mailman/listinfo/vic_users Is there a manual available? No Upload manual if available: Model website if any Model forum / discussion board Comments unsure what type of license Introduction History Papers Issues Help Input Files Output Files Download Source