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How pixel size affects a sediment connectivity index in central Belgium : Pixel size and weighting factor in a sediment connectivity index

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Cantreul, Vincent [Gembloux AgroBioTech, Liège University, Belgium] Bielders, Charles [UCL] Calsamiglia, Aleix [MEDhyCON Research Group, University of the Balearic Islands, Palma de Mallorca, Spain] Degré, Aurore [Gembloux AgroBioTech, Liège University, Belgium]

Connectivity has become an increasingly used concept in hydrological and sediment research. In order to quantify it, various indices have been proposed since the start of the 21st century including the index of connectivity. This index is based on a limited number of factors, the most important one being topography. Sediment connectivity indices values probably depend on the digital elevation model (DEM) resolution. The aim of this study was, first, to compare the effect of DEM pixel size (between 0.25 and 10 m, using an UAV) in the Belgian loess belt, a lowland area. We show that the index values were lower when the pixel size decreased(a difference of about 20% in value between 0.25 and 10 m). In addition, the impact of linear features in the watershed(e.g. grass strip, bank and road) was lower with the largest pixel sizes, and the connectivity pattern was affected with a pixel size of 5m or more. At lower pixel sizes (1m or below), some more disconnected regions appeared. These corresponded with zones where there had been water stagnation during and after rainfalls, and was corroborated by field observations. This confirmed the need for a proper resolution according to the objectives of the study. The second aim of this study was to deduce a minimum pixel size for connectivity study, helping local erosion or sedimentation location and consequent land management decisions. In our context, 1m stands as the optimum DEM resolution. This pixel size permitted location of all ‘key areas’ in terms of erosion. Very high resolutions (<0.5 m) did not generate much more information, and their calculation time was far greater.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès interdit
Publication date 2017
Language Anglais
Journal information "Earth Surface Processes and Landforms" - p. 1-22 (2017)
Publisher Wiley-Blackwell
issn 0197-9337
Publication status Publié
Affiliation UCL - SST/ELI/ELIE - Environmental Sciences
Keywords Earth-Surface Processes ; Earth and Planetary Sciences (miscellaneous) ; Geography ; Planning and Development
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Bibliographic reference Cantreul, Vincent ; Bielders, Charles ; Calsamiglia, Aleix ; Degré, Aurore. How pixel size affects a sediment connectivity index in central Belgium : Pixel size and weighting factor in a sediment connectivity index. In: Earth Surface Processes and Landforms, p. 1-22 (2017)
Permanent URL http://hdl.handle.net/2078.1/192326