/* DATA DESCRIPTION: Citation: Sarma, Barnapratim; Peetz, Cara; Visscher, Jan; Paul, Maike (2026): Velocity fields of seagrass mimics under unidirectional flow [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995605 (DOI registration in progress) Abstract: Seagrass mimics were used to assess the modifications imparted by the mimics on the flow field. For this purpose, laboratory experiments were carried out in September 2023 at the Ludwig-Franzius-Institute of Hydraulic, Estuarine and Coastal Engineering, Leibniz University Hannover, Germany. The seagrass mimics were fabricated from low-density polyethylene (LDPE) with a density of 920 kg/m^3 and a modulus of elasticity of 2.64 ×10^8 N/m^2. Four tropical seagrass species (Enhalus acoroides, Thalassia hemprichii, Halodule uninervis, Halophila ovalis ssp. bullosa) were mimiced by different modelling parameters (see Table 1 in additional metadata file). The full canopy mimic model covered a planform area of 2m × 1m. The seagrass mimic canopy was exposed to unidirectional flow in a recirculating flume with a straight channel of 17.6 m length and 2 m width. The experiments were conducted under four depth-averaged velocities at a constant water depth of 40 cm: 0.13 m/s, 0.21 m/s, 0.28 m/s, 0.35 m/s. Instantaneous velocity measurements were acquired using a stereoscopic Particle Image Velocimetry (PIV) system and a four-beam Acoustic Doppler Velocimeter (ADV). The PIV system measured the three velocity components, namely streamwise, lateral, and vertical velocity components, in a two-dimensional plane in the wake of the canopy centreline (2D3C), while the ADV system measured the same three velocity components at discrete points along vertical profiles at selected streamwise positions relative to the trailing edge of the canopy. The detailed experimental setup, used methods, and data processing are described in the additional metadata file. Keyword(s): Acoustic Doppler velocimetry; Laboratory experiment; Particle Image Velocimetry References: Goring, Derek G; Nikora, Vladimir I (2002): Despiking Acoustic Doppler Velocimeter Data. Journal of Hydraulic Engineering (ASCE), 128(1), 117-126, https://doi.org/10.1061/(ASCE)0733-9429(2002)128:1(117) Raffel, Markus; Willert, Christian E; Scarano, Fulvio; Kähler, Christian J; Wereley, Steve T; Kompenhans, Jürgen (2018): Particle Image Velocimetry. Springer International Publishing, Cham, https://doi.org/10.1007/978-3-319-68852-7 Additional metadata: Sarma, Barnapratim (2026): Detailed method description of experiment investigating the effect of seagrass mimics on on velocity fields. https://download.pangaea.de/reference/140368/attachments/D995605_method_descr.pdf Project(s): DAM CDRmare - sea4soCiety: Searching for solutions for Carbon-sequestration in coastal ecosystems (sea4soCiety) (URI: https://sea4society.cdrmare.de/en/) Research Mission of the German Marine Research Alliance (DAM): Marine carbon sinks in decarbonisation pathways (CDRmare) (URI: https://cdrmare.de/en/) Funding: Federal Ministry of Education and Research (BMBF) (URI: https://www.bmbf.de/), grant/award no. 03F0896G: DAM CDRmare - sea4soCiety, Leibniz University Hannover (URI: https://foerderportal.bund.de/foekat/jsp/SucheAction.do?actionMode=view&fkz=03F0896G) Coverage: DATE/TIME START: 2023-09-04T00:00:00 * DATE/TIME END: 2023-09-08T00:00:00 Event(s): Exp_flow_seagrass * DATE/TIME START: 2023-09-04T00:00:00 * DATE/TIME END: 2023-09-08T00:00:00 * METHOD/DEVICE: Laboratory experiment * COMMENT: Experiment conducted at the Ludwig-Franzius-Institute of Hydraulic, Estuarine and Coastal Engineering, Leibniz University Hannover Parameter(s): File content (Content) * PI: Sarma, Barnapratim (https://orcid.org/0000-0003-4414-392X, sarma@lufi.uni-hannover.de) netCDF file (netCDF) * PI: Sarma, Barnapratim (https://orcid.org/0000-0003-4414-392X, sarma@lufi.uni-hannover.de) netCDF file (File Size) [Bytes] (netCDF (Size)) * PI: Sarma, Barnapratim (https://orcid.org/0000-0003-4414-392X, sarma@lufi.uni-hannover.de) netCDF file (Media Type) (netCDF (Type)) * PI: Sarma, Barnapratim (https://orcid.org/0000-0003-4414-392X, sarma@lufi.uni-hannover.de) netCDF file (MD5 Hash) (netCDF (Hash)) * PI: Sarma, Barnapratim (https://orcid.org/0000-0003-4414-392X, sarma@lufi.uni-hannover.de) Documentation file (DOCS) * PI: Sarma, Barnapratim (https://orcid.org/0000-0003-4414-392X, sarma@lufi.uni-hannover.de) License: Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/) Status: Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels) Size: 6 data points Files: All files referred to in data matrix can be downloaded in one go as ZIP or TAR (PANGAEA user account required). To download single files, use the filename from data matrix appended to "https://download.pangaea.de/dataset/995605/files/". */ Content netCDF netCDF (Size) [Bytes] netCDF (Type) netCDF (Hash) DOCS The ADV dataset is provided as one NetCDF file containing the three streamwise measurement positions as a position dimension, the four inflow conditions as a run dimension, and velocity time series at the measured heights above the bed. Acoustic_Doppler_Velocimetry.nc 68.8 MBytes application/x-hdf 8147a5a45245cd01642b11c465693862 ADV_parameter_table.pdf The PIV dataset is provided as one NetCDF file containing the four inflow conditions as a run dimension and instantaneous 2D3C velocity fields on the measurement plane. Particle_Image_Velocimetry.nc 769 MBytes application/x-hdf cc11e8cd8600201ca46af0dea37e152d PIV_parameter_table.pdf