Model:HexWatershed

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HexWatershed

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Summary Contact Technical specs In/Output Process Testing Other Component info Also known as Model type Single Model part of larger framework Note on status model Date note status model Incorporated models or components: Spatial dimensions 2D, 3D Spatial extent Global, Continental, Regional-Scale, Landscape-Scale, Watershed-Scale Model domain Terrestrial, Hydrology, Coastal, Ecosystems, Cryosphere One-line model description A mesh independent flow direction model for hydrologic models Extended model description HexWatershed is a mesh independent flow direction model for hydrologic models. It can be run at both regional and global scales. The unique feature of HexWatershed is that it supports both structured and unstructured meshes. Keywords: Watershed delineation, Unstructured, hydrology, flow routing, Hexagon, Name Chang Liao Type of contact Model developer Institute / Organization Pacific Northwest National Laboratory Postal address 1 Postal address 2 Town / City Richland Postal code 99354 State Washington Country United States Email address chang.liao@pnnl.gov Phone Fax Name Tian Zhou Type of contact Project manager Institute / Organization Pacific Northwest National Laboratory Postal address 1 Postal address 2 Town / City Richland Postal code 99354 State Washington Country United States Email address tian.zhou@pnnl.gov Phone Fax Supported platforms Unix, Linux, Mac OS, Windows Other platform Programming language C++, Python Other program language Code optimized Single Processor, Multiple Processors Multiple processors implemented Shared memory Nr of distributed processors Nr of shared processors 20 Start year development 2017 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'? 2022 Model availability As code, As teaching tool Source code availability (Or provide future intension) Through web repository Source web address https://github.com/changliao1025/pyhexwatershed Source csdms web address Program license type BSD or MIT X11 Program license type other Memory requirements Depend on study domain and spatial resolution Typical run time Depend on study domain and spatial resolution, a few minutes for a typical watershed. Describe input parameters DEM raster and Hexagon shapefile, stream segment threshold Input format ASCII, Binary Other input format Input and output workspace, etc. Describe output parameters Hexagon DEM, flow direction, flow accumulation, stream grid, stream segment, stream order, stream confluence, subbasin, watershed boundary, etc. Output format ASCII Other output format JSON and VTK Pre-processing software needed? Yes Describe pre-processing software QGIS may be needed to preprocessing some files. Post-processing software needed? No Describe post-processing software Visualization software needed? Yes If above answer is yes ESRI Other visualization software VisIt or QGIS Describe processes represented by the model DEM resampling; Depression filling; Flow direction; Flow accumulation; Describe key physical parameters and equations Terrain analysis. One equation is the resolution of a hexagon can be estimated using its area instead of edge length. Describe length scale and resolution constraints It is best performance for high resolution (<100m) simulation. With the version 3.0, coarser resolution is supported through stream burning feature. Describe time scale and resolution constraints None Describe any numerical limitations and issues Describe available calibration data sets National Hydrography Dataset (NHD) flowline datasets were used to evaluated the model. Upload calibration data sets if available: Media:Please refer to the paper 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? Yes, I plan to use this model with other hydrologic models, both regional and global scale. Is there a manual available? Yes Upload manual if available: Media:https://hexwatershed.readthedocs.io/ Model website if any https://www.hexwatershed.org Model forum / discussion board We currently use Github issue for discussion. https://github.com/changliao1025/pyhexwatershed Comments This part will be filled out by CSDMS staff OpenMI compliant BMI compliant WMT component PyMT component Is this a data component DOI model For model version Year version submitted Link to file Can be coupled with:

Model info Authors Chang Liao Zhou Source code Go to external source code site Model citations Nr. of publications: 1 Total citations: 23 h-index: 1 m-quotient: 0.2 Other models by author HexWatershed

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Nr. of publications:	1
Total citations:	23
h-index:	1
m-quotient:	0.2

Featured publication(s)	Year	Model described	Type of Reference	Citations
Liao, Chang; Tesfa, Teklu; Duan, Zhuoran; Leung, L. Ruby; 2020. Watershed delineation on a hexagonal mesh grid. Environmental Modelling & Software, 128, 104702. 10.1016/j.envsoft.2020.104702 (View/edit entry)	2020	HexWatershed	Model overview	23
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