de.pangaea.dataset936028 und dataset PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact 2026-01-26T09:49:12Z https://doi.pangaea.de/10.1594/PANGAEA.936028 <gco:CharacterString>Comparing fine-scale structural and hydrologic connectivity within unimproved and improved grassland</gco:CharacterString> 2024-12-14T00:04:32 publication https://doi.org/10.1594/PANGAEA.936028 Ellis, Nicola
ne240@exeter.ac.uk
https://orcid.org/0000-0002-9498-4893 information author Brazier, Richard
r.e.brazier@exeter.ac.uk
author Anderson, Karen
karen.anderson@exeter.ac.uk
author PANGAEA
info@pangaea.de
https://www.pangaea.de/ information publisher tableDigital Grasslands vary with diverse forms and functions ranging from monocultures of perennial rye grass to more biodiverse unimproved grasslands which cover around 5% of Europe. Despite the broad diversity of grassland types, within environmental and flood risk models grasslands are frequently represented by a singular set of hydrological and structural parameters which belies their diversity and complexity. This study aimed to determine empirically the extent to which improved vs unimproved grasslands exhibit different hydrological connectivity. Working in SW England at neighbouring field sites with comparable slopes and rainfall regimes, we used unpiloted aerial vehicles to survey a tussocky Molinia caerulea dominated unimproved grassland field (MCUG) field and a Lolium perenne dominated improved grassland (LPIG) field. Using digital photogrammetry workflows applied to the overlapping aerial images, we produced a digital surface model (DSM) at 0.03m resolution from which flow pathways were modelled using GIS and compared with 1m LiDAR and DSM produced by a global navigation satellite system (GNSS). MCUG had longer, tortuous pathways through the dense tussock network with a drainage density of 2.54m m¯². This was significantly greater than drainage density in the LPIG (1.82m m̄²). As a result of this study, we rescaled the Manning's n value for MCUG according to photogrammetrically-derived roughness values. We suggest it should lie between 0.075 and 0.09. Our data shows that MCUG can play an important role in reducing overland flow impacts when compared to LPIG through lower connectivity which can delay runoff to rivers. completed connectivity Flood Grasslands UAV unimproved grassland theme <gco:CharacterString>PANGAEA Keyword List</gco:CharacterString> 1995-01-01 creation PANGAEA
info@pangaea.de
https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation This dataset has been carefully reviewed and curated in accordance with PANGAEA's exceptionally high quality standards. However, due to discontinued communication from the authors' side, it did not receive the usual formal approval by the authors and therefore lacks final scientific validation. application/zip unknown https://download.pangaea.de/dataset/936028/files/Ellis-etal_2021.zip download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. Supplement to <gco:CharacterString>Comparing fine-scale structural and hydrologic connectivity within unimproved and improved grassland</gco:CharacterString> 2021-01-01 publication https://doi.org/10.1002/eco.2330 Ellis, Nicola
ne240@exeter.ac.uk
https://orcid.org/0000-0002-9498-4893 information author Brazier, Richard
r.e.brazier@exeter.ac.uk
author Anderson, Karen
karen.anderson@exeter.ac.uk
author documentDigital Ecohydrology 14(7) e2330