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Open AccessArticle

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

1
Italian National Research Council, Research Institute for Geo-Hydrological Protection (CNR-IRPI), Strada delle Cacce 73, 10135 Torino, Italy
2
Politecnico di Torino—DIATI, Corso Duca Degli Abruzzi, 24 10129 Torino, Italy
3
Dipartimento Tematico Geologia e Dissesto, ARPA Piemonte-Agenzia Regionale per la Protezione Ambientale, Via Pio VII, 9, 10135 Torino, Italy
4
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; https://doi.org/10.3390/s20010289
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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