Abstract
When an active landslide is first identified in an artificial reservoir, a comprehensive study has to be quickly conducted to analyse the possible hazard that it may represent to such a critical infrastructure. This paper presents the case of the El Arrecife Landslide, located in a slope of the Rules Reservoir (Southern Spain), as an example of geological and motion data integration for elaborating a preliminary hazard assessment. For this purpose, a field survey was carried out to define the kinematics of the landslide: translational in favour of a specific foliation set, and rotational at the foot of the landslide. A possible failure surface has been proposed, as well as an estimation of the volume of the landslide: 14.7 million m3. At the same time, remote sensing and geophysical techniques were applied to obtain historical displacement rates. A mean subsidence rate of the landslide around 2 cm/year was obtained by means of synthetic aperture radar interferometry (InSAR) and ground-penetrating radar (GPR) data, during the last 5 and 22 years, respectively. The structure-from-motion (SfM) technique provided a rate up to 26 cm/year during the last 14 years of a slag heap located within the foot of the landslide, due to compaction of the anthropical deposits. All of this collected information will be valuable to optimise the planning of future monitoring surveys (i.e. differential global positioning systems, inclinometers, ground drilling, and InSAR) that should be applied in order to prevent further damage on the reservoir and related infrastructures.
Highlights
The study of a specific landslide must start with a geological and geomorphological characterisation to define its main attributes, such as dimensions, structure, geometry, or volume (Cruden and Varnes 1996)
This paper presents the case of the El Arrecife Landslide, located in a slope of the Rules Reservoir (Southern Spain), as an example of geological and motion data integration for elaborating a preliminary hazard assessment
All of this collected information will be valuable to optimise the planning of future monitoring surveys (i.e. Differential Global Positioning Systems, inclinometers, ground drilling and InSAR) that should be applied in order to prevent further damage on the reservoir and related infrastructures
Summary
The study of a specific landslide must start with a geological and geomorphological characterisation to define its main attributes, such as dimensions, structure, geometry, or volume (Cruden and Varnes 1996) This knowledge is an essential starting point for planning and optimising monitoring surveys, and to provide a conceptual model for modelling the slope. Kiersch 1964; Schuster 1979; Spanilá et al 2002; Wang et al 2004; Gutiérrez et al 2010; Reyes-Carmona et al 2020a) Because these are such critical infrastructures, the monitoring techniques employed must use already registered information to provide quick results with which to rapidly evaluate the possible landslide impacts on the reservoir. These requirements are important to consider in case of an alarm situation
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