| dc.description.abstract | According to literature, landslide dams usually collapse within a short time. Landslide dams are largely triggered by heavy rainfall more so than by earthquakes. Therefore, it is critical to develop a technique for reconstructimg the dam geometry, and to aollect some topography and hydrologic parameters, and to collect some topography and hydrologic parameters, then proceed with the statistical analysis. Typhoon Morakot brought a huge amount of rainfall, which caused many landslide dams in Southern Taiwan in 2009. We have used the Namasiam landslide dam as a basis for this study. DTM and aerial photography is used to reconstruct the dam geometry. The same is conducted for the Xiaolin landslide dam. Particular attention has been paid to stay within the budget and timeframe set. In summary, the total volume of the Namasia landslide dam is estimated to be 8.91 million m3, the dam breach hight is 60 m, the maximum dam height are 68 m, the dam width (along valley) is 2202 m, the maximum of dam length (across valley) is 213 m, and the outflow through the breach to the dam is 179 m. The total volume of the Xiaolin landslide dam is estimated to be 15.34 million m3, the dam breach hight is 44 m, the maximum dam height is 60 m, the dam width (along valley) is 1554 m, the maximum of dam length (across valley) is 500 m and flow through the breaching point of dam length is 370 m. The Xiaolin landslide dams and the Namasia landslide dams were classified as unstable based on DBI and discriminant analysis. The results can enable natural dams to be formed and the assessment of landslide dam stability.
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