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GIS component based 3D landslide hazard assessment system: 3DSlopeGIS

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Abstract

In this paper, based on a new Geographic Information System (GIS) grid-based three-dimensional (3D) deterministic model and taken the slope unit as the study object, the landslide hazard is mapped by the index of the 3D safety factor. Compared with the one-dimensional (1D) model of infinite slope, which is now widely used for deterministic model based landslide hazard assessment in GIS, the GIS grid-based 3D model is more acceptable and is more adaptable for three-dimensional landslide. Assuming the initial slip as the lower part of an ellipsoid, the 3D critical slip surface in the 3D slope stability analysis is obtained by means of a minimization of the 3D safety factor using the Monte Carlo random simulation. Using a hydraulic model tool for the watershed analysis in GIS, an automatic process has been developed for identifying the slope unit from digital elevation model (DEM) data. Compared with the grid-based landslide hazard mapping method, the slope unit possesses clear topographical meaning, so its results are more credible. All the calculations are implemented by a computational program, 3DSlopeGIS, in which a GIS component is used for fulfilling the GIS spatial analysis function, and all the data for the 3D slope safety factor calculation are in the form of GIS data (the vector and the grid layers). Because of all these merits of the GIS-based 3D landslide hazard mapping method, the complex algorithms and iteration procedures of the 3D problem can also be perfectly implemented.

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Authors and Affiliations

  1. Institute of Environmental Systems, Kyushu University, Hakozaki 6-10-1, Higashi Ku, 812-8581, Fukuoka, Japan

    Xie Mo-wen, Zhou Guo-yun & Esaki Tetsuro

Authors
  1. Xie Mo-wen
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  2. Zhou Guo-yun
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  3. Esaki Tetsuro
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Additional information

Foundation item: Under the auspices of Research Institute of Software Engineering (RISE) of Japan (No. 01-004).

Biography: XIE Mo-wen(1965 —), male, a native of Hubei Province of China, associate Prof. of Wuhan University, Ph. D. candidate of Kyushu University of Japan, specialized in geoenvironmental engineering, geotechnical engineering, GIS and GPS application.

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Xie, Mw., Zhou, Gy. & Esaki, T. GIS component based 3D landslide hazard assessment system: 3DSlopeGIS. Chin. Geograph.Sc. 13, 66–72 (2003). https://doi.org/10.1007/s11769-003-0087-3

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  • DOI: https://doi.org/10.1007/s11769-003-0087-3

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