Step by step error assessment in braided river sediment budget using airborne LiDAR data

• Published in: Geomorphology (Amsterdam, Netherlands) Vol. 214; pp. 307 - 323
• Main Authors: LALLIAS-TACON, S, LIEBAULT, F, PIEGAY, H
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.06.2014; Elsevier
• Subjects: Applied geophysics; Braided river; Braiding; Budgeting; Channels; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Exact sciences and technology; Floods; Geography; Humanities and Social Sciences; Internal geophysics; Lidar; Marine and continental quaternary; Natural hazards: prediction, damages, etc; Sediment budget; Sediments; Sequential airborne LiDAR; Surface matching; Surficial geology; Uncertainty propagation analysis; Water depth; France; Europe; Western Europe; ANE, France; Braided river; Uncertainty propagation analysis; Sediment budget; Sequential airborne LiDAR; floods; accuracy; braided streams; deformation; altimetry; rivers; models; detection; maps; density; data processing; digital elevation models; remote sensing; Global Positioning System; airborne methods; depth; propagation; channels; confidence interval; errors; landform evolution
• ISSN: 0169-555X; 1872-695X
• DOI: 10.1016/j.geomorph.2014.02.014

Sequential airborne LiDAR surveys were used to reconstruct the sediment budget of a 7-km-long braided river channel in southeastern France following a 14-year return period flood and to improve its accuracy step by step. Data processing involved (i) surface matching of the sequential point clouds, (ii) spatially distributed propagation of uncertainty based on surface conditions of the channel, and (iii) water depth subtraction from the digital elevation models based on water depths measured in the field. The respective influence of each processing step on sediment budget computation was systematically documented. This showed that surface matching and water depth subtraction both have a considerable effect on the net sediment budget. Although DEM of difference thresholding based on uncertainty analysis on absolute elevation values had a smaller effect on the sediment budget, this step is crucial for the production of a comprehensive map of channel deformations. A large independent data set of RTK-GPS checkpoints was used to control the quality of the LiDAR altimetry. The results showed that high density (7–9points/m2) airborne LiDAR surveys can provide a very high level of detection of elevation changes on the exposed surfaces of the channel, with a 95% confidence interval level of detection between 19 and 30cm. Change detection from LiDAR data revealed that 54% of the pre-flood active channel was reworked by the flood. The braided channel pattern was highly disturbed by the flood owing to the occurrence of several channel avulsions.