Surface grain-size of braided channels from UAV images
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Abstract
Surface grain-size of river channels is a key indicator for assessing physical conditions controlling the quality of aquatic habitats. In the framework of the OFB (French Office for Biodiversity) protocol for characterizing hydromorphological conditions of rivers (CarHyCE protocol), grain-size is obtained by a Wolman pebble count undertaken in a single riffle considered as representative, and punctual observations of substrate type along surveyed cross-sections. This sampling mode only offers a partial transcription of the reach-scale surface grain-size patchiness, which may often show a very high spatial heterogeneity, like for example in braided gravel-bed rivers. A methodology based on high-resolution UAV (Unmanned Aerial Vehicles) images was developed and tested in several alpine braided rivers. First tests showed promising results for further developments and for obtaining a protocol that could be used in routine for such rivers.
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