Lidar DEM and Computational Mesh Grid Resolutions Modify Roughness in 2D Hydrodynamic Models

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dc.contributor.authorPrior, Elizabeth M.en
dc.contributor.authorMichaelson, Nathanen
dc.contributor.authorCzuba, Jonathan A.en
dc.contributor.authorPingel, Thomas J.en
dc.contributor.authorThomas, Valerie A.en
dc.contributor.authorHession, W. Cullyen
dc.date.accessioned2025-01-29T18:23:45Zen
dc.date.available2025-01-29T18:23:45Zen
dc.date.issued2024-07-07en
dc.description.abstractTopography and the computational mesh grid are fundamental inputs to all two-dimensional (2D) hydrodynamic models, however their resolutions are often arbitrarily selected based on data availability. With the increasing use of drone technology, the end user can collect topographic data down to centimeter-scale resolution. With this advancement comes the responsibility of choosing a resolution. In this study, we investigated how the choice of mesh grid and digital elevation model (DEM) resolutions affect 2D hydrodynamic modeling results, specifically water depths, velocities, and inundation extent. We made pairwise comparisons between simulations from a 2D HEC-RAS model with varying mesh grid resolutions (1 and 2 m) and drone-based lidar DEM resolutions (0.1, 0.25, 0.5, 1, and 2 m) over a 1.5 km reach of Stroubles Creek in Blacksburg, Virginia. The model was rerun for up to ±4% change in floodplain roughness to determine how the DEM and mesh grid changes relate to an equivalent change in roughness. We found that the modeled differences from resolution change were equivalent to altering floodplain roughness by up to 12% for depths and 44% for velocities. The largest differences in velocity were concentrated at the channel-floodplain interface, whereas differences in depth occurred laterally throughout the floodplain and were not correlated with lidar ground point density. We also found that the inundation boundary is dependent on the DEM resolution. Our results suggest that modelers should carefully consider what resolution best represents the terrain while also resolving important riparian topographic features.en
dc.description.versionPublished versionen
dc.format.extent18 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifierARTN e2024WR037165 (Article number)en
dc.identifier.doihttps://doi.org/10.1029/2024WR037165en
dc.identifier.eissn1944-7973en
dc.identifier.issn0043-1397en
dc.identifier.issue7en
dc.identifier.orcidThomas, Valerie [0000-0003-2189-6013]en
dc.identifier.orcidHession, William [0000-0002-6323-3827]en
dc.identifier.orcidCzuba, Jonathan [0000-0002-9485-2604]en
dc.identifier.orcidPrior, Elizabet [0000-0001-7069-160X]en
dc.identifier.orcidPingel, Thomas [0000-0002-5911-2803]en
dc.identifier.urihttps://hdl.handle.net/10919/124437en
dc.identifier.volume60en
dc.language.isoenen
dc.publisherAmerican Geophysical Unionen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjecthydrodynamic modelingen
dc.subjectlidaren
dc.subjectdroneen
dc.subjectflooden
dc.subjectfloodplainen
dc.subjectroughnessen
dc.titleLidar DEM and Computational Mesh Grid Resolutions Modify Roughness in 2D Hydrodynamic Modelsen
dc.title.serialWater Resources Researchen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
pubs.organisational-groupVirginia Techen
pubs.organisational-groupVirginia Tech/Natural Resources & Environmenten
pubs.organisational-groupVirginia Tech/Natural Resources & Environment/Geographyen
pubs.organisational-groupVirginia Tech/Natural Resources & Environment/Forest Resources and Environmental Conservationen
pubs.organisational-groupVirginia Tech/Agriculture & Life Sciencesen
pubs.organisational-groupVirginia Tech/Agriculture & Life Sciences/Biological Systems Engineeringen
pubs.organisational-groupVirginia Tech/Natural Resources & Environment/Geography/Geography T&R facultyen
pubs.organisational-groupVirginia Tech/All T&R Facultyen
pubs.organisational-groupVirginia Tech/Natural Resources & Environment/CNRE T&R Facultyen
pubs.organisational-groupVirginia Tech/Agriculture & Life Sciences/CALS T&R Facultyen
pubs.organisational-groupVirginia Tech/Graduate studentsen
pubs.organisational-groupVirginia Tech/Graduate students/Doctoral studentsen

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