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Use of terrestrial photosieving and airborne topographic LiDAR to assess bed grain size in large rivers: a study on the Rhine River

Abstract : Most grain size monitoring is still being conducted by manual sampling in the field, which is time consuming and has low spatial representation. Due to new remote sensing methods, some limitations have been partly overcome, but methodological progress is still needed for large rivers as well as in underwater conditions. In this terrestrial photosieving is a reliable method to estimate the GSD of sediment patches in both above-water and underwater conditions with clean substrates. Sensitivity analyses showed that environmental conditions, including solar lighting conditions and petrographic variability, significantly influence the GSD from the automatic procedure in above-water conditions. The presence of biofilm in underwater conditions significantly altered the GSD estimation using the automatic procedure, but the proposed manual procedure overcame this problem. The airborne LiDAR topographic survey is an accurate method to estimate the GSD of above-water bedforms and is able to generate grain size maps. The combination of terrestrial photosieving and airborne topographic LiDAR methods is adapted to assess the GSD along large rivers in entire sections that are several kilometers long.
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https://hal.archives-ouvertes.fr/hal-03004392
Contributor : Dimitri Lague Connect in order to contact the contributor
Submitted on : Thursday, November 26, 2020 - 12:16:53 PM
Last modification on : Thursday, June 2, 2022 - 2:48:17 PM
Long-term archiving on: : Saturday, February 27, 2021 - 7:00:23 PM

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Valentin Chardon, Laurent Schmitt, Hervé Piégay, Dimitri Lague. Use of terrestrial photosieving and airborne topographic LiDAR to assess bed grain size in large rivers: a study on the Rhine River. Earth Surface Processes and Landforms, 2020, 45 (10), pp.2314-2330. ⟨10.1002/esp.4882⟩. ⟨hal-03004392⟩

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