Abstract
Abstract. After the heavy rains of 2009/10 winter, a road cut in the national highway A-44 and the upper slope became unstable; the mass invaded the way and caused important traffic interruptions by several months. The landslide was measured by means of terrestrial laser-scanner techniques and, because of the zone morphology, the used methodology involved scanning the mobilized zone from different stations with several captures from each point. Two scanning campaigns were carried out in a time interval of 14 days. The antenna phase centers were determined by GPS techniques and incorporated to the point clouds as an additional point in the TLS reference system; next, the relative orientation of the different point clouds of each scan station is made, adjusting and merging them in a single point cloud; finally, we proceed to data transformation to a reference system global and common to both campaigns, in which surface and terrain models can be compared. From field data, a digital surface model have been built, and then filtered and edited to have digital elevation models of centimeter spatial resolution. The results obtained by the comparison of models show two rupture zones in the road cut affecting also to the upslope, in which an important volume material flowed with superficial displacements of about 0,55–0,65 m day-1. We also calculated 210 m3 of depleted material and 124,5 m3 of accumulated material; the differences between these volumes (wasting material) are explained because the civil works that were made to clear the road of materials.
Highlights
Landslides are one of the most widespread earth surface hazards, causing hundred of human victims and billions of dollars in damages per year
We describe a methodological approach for referencing terrestrial laser scanner data for multi-temporal studies in landslide monitoring
After single point clouds corresponding to both campaigns are obtained, a surface model (DSM) can be obtained where we take in account both the points assigned to terrain surface and the points not assigned to the terrain surface
Summary
Landslides are one of the most widespread earth surface hazards, causing hundred of human victims and billions of dollars in damages per year. The use of ETSR89 –the official reference system that are being adopted in Spain for the years- as stable system for the two field campaigns allow carry out a multi-temporal study in a reliable way This procedure, in which the position of measurement stations are obtained using GPS, is applied because of the unfavorable conditions of the study zone: the instability of the whole scanned terrain where not enough wide stable zones can be found, the poor or null accessibility making impossible the use of targets, a not very adequate geometry stations network located in the opposite slope, and a complex terrain with a lot of fallen blocks and vegetation. The campaigns were carried out between 10 and 24 March 2010, a two weeks period, in the moment of higher activity of landslide
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