Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B3, 227-232, 2016
http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLI-B3/227/2016/
doi:10.5194/isprs-archives-XLI-B3-227-2016
 
09 Jun 2016
MORPHOLOGICAL CHANGES ALONG A DIKE LANDSIDE SLOPE SAMPLED BY 4D HIGH RESOLUTION TERRESTRIAL LASER SCANNING
Mónica Herrero-Huertaa1, Roderik Lindenbergh1, Luc Ponsioen2, and Myron van Damme2 1Department of Geoscience and Remote Sensing, Delft University of Technology, 2628 CN Delft, The Netherlands
2Department of Hydraulic Structures and Flood Risk, Delft University of Technology, 2628 CN Delft, The Netherlands
Keywords: Terrestrial laser scanner, morphological changes, dike landside slope, erosion and deposition, hydrogeological models, LiDAR Abstract. Emergence of light detection and ranging (LiDAR) technology provides new tools for geomorphologic studies improving spatial and temporal resolution of data sampling hydrogeological instability phenomena. Specifically, terrestrial laser scanning (TLS) collects high resolution 3D point clouds allowing more accurate monitoring of erosion rates and processes, and thus, quantify the geomorphologic change on vertical landforms like dike landside slopes. Even so, TLS captures observations rapidly and automatically but unselectively.

In this research, we demonstrate the potential of TLS for morphological change detection, profile creation and time series analysis in an emergency simulation for characterizing and monitoring slope movements in a dike. The experiment was performed near Schellebelle (Belgium) in November 2015, using a Leica Scan Station C10. Wave overtopping and overflow over a dike were simulated whereby the loading conditions were incrementally increased and 14 successful scans were performed. The aim of the present study is to analyse short-term morphological dynamic processes and the spatial distribution of erosion and deposition areas along a dike landside slope. As a result, we are able to quantify the eroded material coming from the impact on the terrain induced by wave overtopping which caused the dike failure in a few minutes in normal storm scenarios (Q = 25 l/s/m) as 1.24 m3. As this shows that the amount of erosion is measurable using close range techniques; the amount and rate of erosion could be monitored to predict dike collapse in emergency situation.

The results confirm the feasibility of the proposed methodology, providing scalability to a comprehensive analysis over a large extension of a dike (tens of meters).

Conference paper (PDF, 1803 KB)


Citation: Herrero-Huertaa, M., Lindenbergh, R., Ponsioen, L., and van Damme, M.: MORPHOLOGICAL CHANGES ALONG A DIKE LANDSIDE SLOPE SAMPLED BY 4D HIGH RESOLUTION TERRESTRIAL LASER SCANNING, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B3, 227-232, doi:10.5194/isprs-archives-XLI-B3-227-2016, 2016.

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