River Deltas Composite Resource W912HZ2520012 U.S. Army Engineer Research and Development Center This resource contains the complete Delft3D Flexible Mesh (DFM) input files for the nine numerical experiments reported in Jean Louis et al. (2026), "The role of seasonal vegetation dynamics in shaping river delta channel networks and morphodynamics," Geomorphology 506, 110327 (https://doi.org/10.1016/j.geomorph.2026.110327). The model simulates the initial formation of a river delta in an idealized Cartesian basin with cell sizes of 25–50 m, loosely representing the Wax Lake Delta, Louisiana, USA. A river channel debouches into a receiving basin over an erodible bed of 20 m of sediment mixed at a mud-to-sand ratio of 0.30:0.70. The downstream water level is held at zero, and no tides or waves are applied. With a morphological acceleration factor of 10, the 365-day hydrodynamic simulation corresponds to ten years of morphological evolution. Vegetation is represented statically through the Baptist et al. (2007) roughness formulation, activated in the MDU and supplied with spatially uniform, temporally constant fields of 40 stems m⁻², 0.01 m stem diameter, and 0.3 m stem height inside a polygon covering the marsh platform. The no-vegetation deck differs by a single line — Vegetationmodelnr — with all other input files byte-identical, so the vegetation effect is isolated and independently verifiable. The dynamic vegetation runs are a product of DFM coupled with NBSDynamics (https://github.com/Deltares-research/NBSDynamics). Each scenario folder holds the grid, bathymetry, boundary conditions, sediment and morphology configuration, vegetation polygon and forcing file, and a relative-path DIMR configuration. Runs used the D-Flow FM kernel 1.2.104.67016M. Model output is not included. Matthew Hiatt 3 Louisiana State University mhiatt1@lsu.edu U.S. National Science Foundation 2023443 2026-09-05T12:38:29.578406+00:00 U.S. National Science Foundation 2142881 This resource is shared under the Creative Commons Attribution CC BY. Influences of Seasonal Vegetation Dynamics and Morphological Change on Water Age and Connectivity in River Deltas [Dataset] NBSDynamics eng MetaData Resource type: Composite Resource, or Model Instance if linked to a Model Program resource for Delft3D FM. Subject keywords: Delft3D FM, D-Flow FM, DIMR, Baptist, vegetation roughness, nature-based solutions, morphodynamics, sediment transport, river delta, Wax Lake Delta, geometric efficiency, idealized model. Spatial coverage: none. The domain is an idealized Cartesian basin and is not geo-referenced, so no bounding box applies. Temporal coverage: 2001-01-01 to 2001-12-31 model time (365 days; 10 morphological years at `MorFac = 10`). License: CC-BY-NC 4.0, matching the article. Related resources: the article, DOI 10.1016/j.geomorph.2026.110327; the Delft3D FM source, https://oss.deltares.nl/web/delft3dfm; and NBSDynamics, https://github.com/Deltares-research/NBSDynamics. Jean Louis, M., Dijkstra, J., Hiatt, M. (2026). Influences of Seasonal Vegetation Dynamics and Morphological Change on Water Age and Connectivity in River Deltas [Dataset], HydroShare, http://www.hydroshare.org/resource/4de5ad8d088f437db5b62b3f6308583f Deltares 2 Jasper.Dijkstra@deltares.nl Jasper Dijkstra 2026-09-03T01:26:24.508974+00:00 Delft3D FM W912HZ2220005 U.S. Army Engineer Research and Development Center mjeanlouis1@ua.edu +1 (225) 409-8190 Jean Louis, Madoche University of Alabama - Tuscaloosa 29619 1 29619 Vegetation