⚫ PIV analysis
The PIV analysis is applied for the displacement and distribution of the Yucheliao Landslide. In the PIV analysis, velocity vector measurement on the Yucheliao Landslide can be derived by the cross-correlation method.
1. In the pre-event pair of images, the displacement derived from small interrogation window is doubted once the target is larger than interrogation window.
2. In the post-event pair of images, larger interrogation window is set to detect larger displacement, but the degree of correlation would decrease expectedly.
3. In both the pre-event pair and the post-event pair, the change in land cover obviously caused the errors of the displacements derived from PIV analysis. Especially, change in land cover is mainly caused by erosion when Typhoon Morakot hit and the formation of the landslide scarp in the post-event pair.
4. Parametric tests on the size of the interrogation window is needed before the PIV analysis to avoid inaccuracy in result. Larger displacement can be detected when large interrogation window is
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set, but the degree of correlation would decrease.
5. The distribution of landslide region in the Yucheliao Landslide and other landslides can be roughly determined since the region with larger displacement tends to occur within the landslide region. The direction of displacement vectors indicates that the slip direction of the Yucheliao Landslide is mainly southward.
⚫ Numerical modeling
In the numerical modeling, the slope stability analysis by shear strength reduction method is applied, and the geometry of landslide slip surface is interpreted by the FEM analysis.
1. By the shear strength reduction method, the results show that both the slope with homogeneous rocks and the slope with layered rocks are relatively stable than slope with the pre-existing slip surface.
2. If the previous deformation or fracture along the strata boundary is considered, the stability of a slope with layered rocks may be overestimated.
3. The slip surface interpreted by surface displacement derived from the numerical modeling is shallower than the slip surface derived by the shear strength reduction method.
4. The geometry of the interpreted slip surface tends to be a planar failure, which is different from the geometry of slip surface derived by the shear strength reduction method.
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