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Impact of DEM Processing on the Geotechnical Instability Analysis of Waste Heaps in Wallonia

Authors:
Odile Close
Nathalie Stéphenne
Christophe Frippiat

Keywords: Digital Elevation Model, LiDAR, geotechnical risk, geospatial web services, terrain analysis

Abstract:
This paper evaluates the effects of Digital Elevation Model (DEM) processing on the geotechnical instability analysis of four waste heaps located in Western Wallonia. For this purpose, an infinite slope stability equation has been computed on each cell of two DEMs (LiDAR and ERRUISSOL, available on the geoportal of Wallonia). By processing raw LiDAR data with various interpolation techniques and spatial resolutions, we tested their influence on the slope stability analysis. In order to better understand the real geotechnical stability, several datasets have been used in the analysis (field observation, historical aerial photography and ortho-photos). Our results show that interpolation techniques and spatial resolution affect the DEM quality in regard to slope stability analysis. In particular, by removing striped patterns resulting from data acquisition, the Triangulation technique facilitates stability assessment. According to our findings, 10 m resolution is sufficient and adequate for stability analysis while 1 m resolution overestimates the risk of slope failure.

Pages: 7 to 13

Copyright: Copyright (c) IARIA, 2016

Publication date: April 24, 2016

Published in: conference

ISSN: 2308-393X

ISBN: 978-1-61208-469-5

Location: Venice, Italy

Dates: from April 24, 2016 to April 28, 2016