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A first step towards a IoT-based local early warning system for an unsaturated slope in Norway

Author

Listed:
  • Luca Piciullo

    (Norwegian Geotechnical Institute)

  • Vittoria Capobianco

    (Norwegian Geotechnical Institute)

  • Håkon Heyerdahl

    (Norwegian Geotechnical Institute)

Abstract

A framework for a IoT-based local landslide early warning system (Lo-LEWS) has been proposed. Monitoring, modelling, forecasting and warning represent the main phases of the proposed framework. In this study, the first two phases have been applied to capture the hydrological behaviour of a natural unsaturated slope located adjacent to a railway track in Eastern Norway. The slope is monitored and the stability is kept under frequent observation, due to its steepness and the presence of the railway lines at the toe. The commercial software GeoStudio SEEP was used to create and calibrate a model able to replicate the in situ monitored volumetric water content (VWC) and pore water pressure (PWP) regime. The simulations conducted were divided into two main series: one with an initial calibration of the VWC profile (C) and another with no calibration (NC). The simulations have been validated using Taylor diagrams, which graphically summarize how closely a pattern (or a set of patterns) matches observations. The results show that a preliminary calibration for matching the in situ VWC, as well as considering climate conditions and vegetation, are crucial aspects to model the response of the studied unsaturated slope. A sensitivity analysis on the hydraulic conductivity and the permeability anisotropy ratio contributed to better define the input data and to improve the best-fit model result. The effectiveness of the best simulation, in back-calculating VWC, was tested for 3 different time periods: 6-month, 1-year, 1.25-year. The results show that the hydrological model can adequately represent the real monitored conditions up to a 1-year period, a recalibration is needed afterward. In addition, a slope stability analysis with GeoStudio SLOPE for the 1-year period was coupled to the hydrological model. Finally, the calculated safety factor (FS), the temperature, the precipitation, the VWC and PWP monitored were used as input dataset for a supervised machine learning algorithm. A random forest model highlighted the importance of the monitored VWC for forecasting the FS. The findings presented in this paper can be seen as a first step towards an Internet of Things (IoT)-based real-time slope stability analysis that can be employed as Lo-LEWS.

Suggested Citation

  • Luca Piciullo & Vittoria Capobianco & Håkon Heyerdahl, 2022. "A first step towards a IoT-based local early warning system for an unsaturated slope in Norway," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 114(3), pages 3377-3407, December.
    • Handle: RePEc:spr:nathaz:v:114:y:2022:i:3:d:10.1007_s11069-022-05524-3
    DOI: 10.1007/s11069-022-05524-3
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    References listed on IDEAS

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    1. Piñeiro, Gervasio & Perelman, Susana & Guerschman, Juan P. & Paruelo, José M., 2008. "How to evaluate models: Observed vs. predicted or predicted vs. observed?," Ecological Modelling, Elsevier, vol. 216(3), pages 316-322.
    2. Simone Fatichi & Dani Or & Robert Walko & Harry Vereecken & Michael H. Young & Teamrat A. Ghezzehei & Tomislav Hengl & Stefan Kollet & Nurit Agam & Roni Avissar, 2020. "Soil structure is an important omission in Earth System Models," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
    3. Vittoria Capobianco & Kate Robinson & Bjørn Kalsnes & Christina Ekeheien & Øyvind Høydal, 2021. "Hydro-Mechanical Effects of Several Riparian Vegetation Combinations on the Streambank Stability—A Benchmark Case in Southeastern Norway," Sustainability, MDPI, vol. 13(7), pages 1-19, April.
    4. Caterina Melchiorre & Paolo Frattini, 2012. "Modelling probability of rainfall-induced shallow landslides in a changing climate, Otta, Central Norway," Climatic Change, Springer, vol. 113(2), pages 413-436, July.
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    1. Gongfa Chen & Wei Deng & Mansheng Lin & Jianbin Lv, 2023. "Slope stability analysis based on convolutional neural network and digital twin," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 118(2), pages 1427-1443, September.

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