Abstract
Fractal phenomena are a naturally occurring characteristic of landslides. In the process of landsliding, a series of traces of the rupture surface on the ground surface extends progressively, as various types of slope failure occur. After this enlarging of the surface of rupture is completed, mass movements increase the volume of material because the displaced material dilates. After landslide occurrence, geometrical features of the rupture surface appearing on the ground surface are one way of providing information to evaluate slope instability. Correspondingly, fractal dimensions of the landslide boundary trace can reach a maximum in view of its geometry, which indicates that the landslide is in a critically stable state. In the case of changes of external factors, slide masses are likely to reactivate. This chapter addresses fractal dimensions of the trace of a landslide outline and its application in evaluating slope instability. In the vicinity of Badong County Town on the south shore of the Three Gorges Reservoir, fractal dimensions of 11 landslides with respect to boundary trace were calculated using a box-counting method. Six landslides were chosen as a case study to distinguish the relationship between fractal dimensions of boundary trace and slope instability. Compared with previous work in calculating the factor of safety, a landslide has the potential to reactivate if the value of fractal dimensions is between 1.4 and 1.5. A landslide is stable overall but minor slope failures are likely to occur in small areas, if the value of fractal dimensions is 1.1–1.3. A value of fractal dimensions of 1.0 indicates that the landslide is in a stable state. In summary, landslides with larger fractal dimensions in view of the boundary trace were evaluated as not being in a stable state.
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Acknowledgments
This research was financially supported by funding from National Nature Science Foundation of China (No. 40472153 and No. 40772170). Partial support from the Ministry of Science and Technology (No. 2006BAC04B05 and No. 2004DIB3J080) is acknowledged with thanks. The second author thanks the partial funding from Huazhong University of Science and Technology.
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Wu, S., Wang, H., Han, J., Shi, J., Shi, L., Zhang, Y. (2009). The Application of Fractal Dimensions of Landslide Boundary Trace for Evaluation of Slope Instability. In: Wang, F., Li, T. (eds) Landslide Disaster Mitigation in Three Gorges Reservoir, China. Environmental Science and Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00132-1_21
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DOI: https://doi.org/10.1007/978-3-642-00132-1_21
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