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Open AccessArticle

Low-Cost GNSS Solution for Continuous Monitoring of Slope Instabilities Applied to Madonna Del Sasso Sanctuary (NW Italy)

Italian National Research Council, Research Institute for Geo-Hydrological Protection (CNR-IRPI), Strada delle Cacce 73, 10135 Torino, Italy
Politecnico di Torino—DIATI, Corso Duca Degli Abruzzi, 24 10129 Torino, Italy
Dipartimento Tematico Geologia e Dissesto, ARPA Piemonte-Agenzia Regionale per la Protezione Ambientale, Via Pio VII, 9, 10135 Torino, Italy
CSP Innovazione nelle ICT s.c.a r.l., Strada del Lionetto 6, 10146 Torino, Italy
Author to whom correspondence should be addressed.
Sensors 2020, 20(1), 289;
Received: 8 November 2019 / Revised: 20 December 2019 / Accepted: 30 December 2019 / Published: 4 January 2020
In recent years, the development of low-cost GNSS sensors allowed monitoring in a continuous way movement related to natural processes like landslides with increasing accuracy and limited efforts. In this work, we present the first results of an experimental low-cost GNSS continuous monitoring applied to an unstable slope affecting the Madonna del Sasso Sanctuary (NW Italy). The courtyard of Sanctuary is built on two unstable blocks delimited by a high cliff. Previous studies and non-continuous monitoring showed that blocks suffer a seasonal cycle of thermal expansion and a long-term trend to downslope a few millimeters (2/3) per year. The presence of a continuous monitoring solution could be an essential help to better understand the kinematics of unstable slope. Continuous monitoring could help to forecast a possible paroxysm phase that could end with a failure of the unstable area. The first year of experimental measurements shows a millimetric accuracy of low-cost GNSS, and the long-term trend is in agreement with other monitoring data. We also propose a methodological approach that considers the use of semi-automatized procedures for the identification of anomalous trends and a risk communication strategy. Pro and cons of the proposed methodology are also discussed. View Full-Text
Keywords: low-cost GNSS; warning threshold; unstable slope; cultural heritage low-cost GNSS; warning threshold; unstable slope; cultural heritage
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MDPI and ACS Style

Notti, D.; Cina, A.; Manzino, A.; Colombo, A.; Bendea, I.H.; Mollo, P.; Giordan, D. Low-Cost GNSS Solution for Continuous Monitoring of Slope Instabilities Applied to Madonna Del Sasso Sanctuary (NW Italy). Sensors 2020, 20, 289.

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