Monitoring instability steep slope using three-dimension point clouds at multiple time

T. Kikuchi, K. Sakita, S. Nishiyama, T. Hatano

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Recent years have seen reports of rock collapses and rock-falls from steep slopes, even if such points have not been extracted as those requiring inspection. In the maintenance of steep slopes, it is important to confirm the presence of rock-falls and source rocks corresponding to the outlined survey; however, it can be difficult to investigate from the target structure to the vicinity of the ridge because of cost concerns and vegetation overgrowth. It is important to obtain detailed geographical information for an efficient overview survey; therefore, laser measurement technologies with significant performance improvements have been used in the field of slope disasters including public surveys and the study of landslides, and it is expected that the utility of these technologies will further increase. Herein, multiple combinations of airborne and ground-based laser measurement technologies were used to study steep slopes facing a river. Fluctuation analysis was performed using three-dimensional (3D) point cloud data obtained via laser measurements. As a result, airborne laser measurements deciphered 1.5-m high scarplets. Furthermore, by conducting displacement vector analysis, we grasped the tendency of fluctuation that gradually increased from the mountain to the river. In addition, for the overhanging blocks closest to the river, we detected an average variation of 141 mm via displacement vector analysis using a terrestrial laser scanner (TLS) with a 2-m mesh. We report the evaluated behavior of steep slopes depending on the type of topography and geology and the effectiveness of the technology as a periodic measurement method for maintenance purposes.

    Original languageEnglish
    Title of host publicationISRM International Symposium - EUROCK 2020
    EditorsC.C. Li, H. Odegaard, A.H. Hoien, J. Macias
    PublisherInternational Society for Rock Mechanics
    ISBN (Electronic)9788282080729
    Publication statusPublished - 2020
    EventISRM International Symposium - EUROCK 2020 - Trondheim, Virtual, Norway
    Duration: Jun 14 2020Jun 19 2020

    Publication series

    NameISRM International Symposium - EUROCK 2020

    Conference

    ConferenceISRM International Symposium - EUROCK 2020
    Country/TerritoryNorway
    CityTrondheim, Virtual
    Period6/14/206/19/20

    Keywords

    • Landslide
    • Maintenance
    • Point cloud data
    • Steep slope

    ASJC Scopus subject areas

    • Geochemistry and Petrology

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