英文摘要
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About two-thirds of Taiwan’s total area is covered by mountains and hills. Coupled with the global climate change, rainfall-induced landslides often occur and lead to human causalities and properties loss. Therefore, the assessment of rainfall-induced landslides is indeed an important task.
The study areas in this research are the Tsengwen and Nanhua Dam watershed in the southern Taiwan. The FORMOSAT satellite images before and after the years 2009-2013 (including 7 typhoons and rainfall events) were acquired and used. The Genetic Adaptive Neural Network (GANN) was implemented in the analysis techniques for the interpretation of satellite images and to obtain surface information and hazard log data. The scope of the impact of different rainfall stations in the study area was estimated using Thiessen's Polygon Method to explore the characteristics of rainfall. The relationship between the pattern, amount, and duration of rainfall and location and scale of landslide was also explored.
The results of image classification show that the average value of coefficient of agreement is 0.75 at medium-high level. The rainfall patterns are classified into 5 types using 72-hour rainfall duration for each rainfall station: pre-peak, central-peak, post-peak, twin-peak, and tri-peak. The results also show that when the accumulated rainfall is small, rainfall pattern affect the number and scale of landslides. When the accumulated rainfall is large, there is no correlation between rainfall patterns and landslides. Furthermore, regardless rainfall patterns most landslide sites occur in slope between 20˚ and 40˚. Pre-peak and central-peak rainfall-induced landslides sites occur in slope between 20˚ and 30˚. The other rainfall-induced landslides sites occur in slope between 30˚ and 40˚. Moreover, in the case of the same accumulated rainfall, the elevations of landslides induced by pre-peak and central-peak are much higher than those induced by the others.
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