Model:Grfin

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Grfin

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Model type Tool Model part of larger framework Note on status model Date note status model Incorporated models or components: Spatial dimensions 2D Spatial extent Watershed-Scale, Reach-Scale Model domain Terrestrial One-line model description Empirical, GIS-based tools for modeling landslide runout and debris-flow growth and inundation on a DEM. Extended model description The software package, Grfin Tools, can estimate potential runout from landslides or inundation from geophysical mass flows such as debris flows, lahars from volcanoes, and rock avalanches within a digital elevation model (DEM). Grfin is an acronym of growth + flow + inundation. The tools within this package apply simple, well-tested, empirical models of runout that are computationally efficient and require minimal parameters. These tools can be used individually (for example, to estimate debris-flow inundation) or in combination to represent a more complete series of linked processes, from landslide source areas, to unchannelized transport, to channelized flows. Grfin Tools can rapidly assess potential runout and inundation over large areas and the results are readily visualized in a geographic information system. Keywords: Runout from landslides, Debris flow, Lahar, Rock avalanche, Inundation, Name Mark Reid Type of contact Project manager Institute / Organization USGS Postal address 1 Postal address 2 Town / City Moffett Field Postal code 94035 State California Country United States Email address mreid@usgs.gov Phone Fax Name Collin Cronkite-Ratcliff Type of contact Model developer Institute / Organization USGS Postal address 1 Postal address 2 Town / City Moffett Field Postal code 94035 State California Country United States Email address ccronkite-ratcliff@usgs.gov Phone Fax Supported platforms Windows Other platform Programming language C++ Other program language Code optimized Single Processor Multiple processors implemented Nr of distributed processors Nr of shared processors Start year development 2024 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'? 2026 Model availability As code Source code availability (Or provide future intension) Through web repository Source web address https://code.usgs.gov/grfintools/grfintools Source csdms web address Program license type Other Program license type other CC0 Memory requirements -- Typical run time -- Describe input parameters DEM; optional landslide source or susceptibility raster; parameters for H/L or angle of reach, slope and curvature thresholds, growth factors, and volume–area coefficients Input format Binary Other input format Raster GeoTIFF Describe output parameters Source areas, runout zones, drainage network, flow volumes along channels, inundation extents Output format Binary Other output format Raster, GeoTIFF Pre-processing software needed? Yes Describe pre-processing software TauDEM (flow directions, contributing area, channel network); a GIS for preparing the DEM Post-processing software needed? No Describe post-processing software Visualization software needed? Yes If above answer is yes Other visualization software Any GIS (for example ArcGIS or QGIS) Describe processes represented by the model Processes: Landslide initiation areas, open-slope runout, downstream flow growth (entrainment, bank failure, hillslope inputs), and channelized inundation Describe key physical parameters and equations [[Describe key physical parameters::Key equations: H/L ratio and angle of reach for unchannelized runout Volume–area scaling for inundation, of the LAHARZ type: cross-sectional area A = αV^(2/3) and planimetric area B = βV^(2/3) [confirm coefficients] Empirical growth factors per unit contributing area or per unit channel length]] Describe length scale and resolution constraints -- Describe time scale and resolution constraints Static and event-based. It doesn’t simulate flow dynamics or time evolution. Describe any numerical limitations and issues It’s empirical, with no rheology or momentum. Results depend on the calibration of the scaling coefficients and on DEM quality. 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? Is there a manual available? No Upload manual if available: Model website if any https://code.usgs.gov/grfintools/grfintools Model forum / discussion board Comments This part will be filled out by CSDMS staff OpenMI compliant No not possible BMI compliant No not possible WMT component No not possible PyMT component No not possible Is this a data component No DOI model 10.5066/P9NVKFE2 For model version 1.0 Year version submitted 2025 Link to file https://doi.org/10.5066/P9NVKFE2 Can be coupled with:

Model info Authors Mark Reid Cronkite-Ratcliff Source code Go to external source code site DOI Download Grfin version: 1.0 Doi: 10.5066/P9NVKFE2 Model citations Other models by author Grfin

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Featured reference(s)	Open Access Status	Year	Type of Reference	Cited
Reid, M.E.; Brien, D.L.; Cronkite-Ratcliff, C.; and Perkins, J.P.; 2025. Grfin Tools—User guide and methods for modeling landslide runout and debris-flow growth and inundation. USGS Numbered Series, 14-A3105 p.. 10.3133/tm14A3	unknown	2025	a module application description	0