Movement of deep-seated rainfall-induced landslide at Hsiaolin Village during Typhoon Morakot
Movement of deep-seated rainfall-induced landslide at Hsiaolin Village during Typhoon Morakot
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DOI：
10.1007/s10346-012-0315-y
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发表时间：
2012
期刊：
影响因子：
6.7
通讯作者：
Yu-Shu Kuo;Y. Tsai;Yu-Shiu Chen;C. Shieh;K. Miyamoto;T. Itoh
中科院分区：
文献类型：
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作者：
Yu-Shu Kuo;Y. Tsai;Yu-Shiu Chen;C. Shieh;K. Miyamoto;T. Itoh
本研究分析了2009年莫拉克台风期间小林村山体滑坡的发生机制。这起山体滑坡事件造成400人死亡。极大强度和累积性降雨事件可能引发大规模复杂的滑坡灾害。为了研究和了解滑坡事件，采用了现场调查和数值模型相结合的方法。滑坡区域是通过比较事件前后的地形信息来确定的。地貌参数是通过野外调查确定的。将这些参数应用于一个数值模型来模拟滑坡过程。由于降雨强度大，在滑坡发生前80小时内降雨1675毫米，土壤水分迅速增加，导致滑坡发生。据幸存者介绍，山体滑坡的总持续时间不到3分钟。模拟结果表明，滑坡总历时约为15万年。滑坡发生后，滑坡体在S 30~50岁时在El 590处被一条支线分成两部分，一部分在S 30至60岁左右通过该支线，一部分淹没了小林村，另一部分沉积在当地河道，形成了滑坡坝。滑坡坝高50~60米，长800~900米，模拟结果表明，该模型可以用来评价极强降雨事件诱发滑坡的潜在区域。
This study analyzes the mechanism of the landslide event at Hsiaolin Village during Typhoon Morakot in 2009. This landslide event resulted in 400 deaths. The extremely high intensity and accumulative rainfall events may cause large-scale and complex landslide disasters. To study and understand a landslide event, a combination of field investigations and numerical models is used. The landslide area is determined by comparing topographic information from before and after the event. Physiographic parameters are determined from field investigations. These parameters are applied to a numerical model to simulate the landslide process. Due to the high intensity of the rainfall event, 1,675 mm during the 80 h before the landslide event, the water content of soil was rapidly increased causing a landslide to occur. According to the survivors, the total duration of the landslide run out was less than 3 min. Simulation results indicated that the total duration was about 150 s. After the landslide occurrence, the landslide mass separated into two parts by a spur at EL 590 in about 30 to 50 s. One part passed the spur in about 30 to 60 s. One part inundated the Hsiaolin Village and the other deposited at a local river channel and formed a landslide dam. The landslide dam had height between 50 and 60 m and length between 800 and 900 m. The simulation result shows that the proposed model can be used to evaluate the potential areas of landslides induced by extremely high intensity rainfall events.