Rainfall-triggered large landslides on 15 December 2005 in Van Canh District, Binh Dinh Province, Vietnam
Rainfall-triggered large landslides on 15 December 2005 in Van Canh District, Binh Dinh Province, Vietnam
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DOI：
10.1007/s10346-012-0362-4
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发表时间：
2013-04
期刊：
影响因子：
6.7
通讯作者：
D. M. Duc
中科院分区：
文献类型：
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作者：
D. M. Duc
山体滑坡是越南最危险的灾害之一。大多数滑坡发生在开挖边坡上，自然边坡失稳在国内很少见。然而，自然斜坡破坏的数量可能非常大，并且可能对大面积区域造成严重影响。在经历了2005年第四季度长时间的强降雨之后，万景县于2005年12月15日发生了一系列滑坡，滑坡体积达20,000-195,000立方米。滑坡的移动距离超过300-400米，滑坡产生了一些明显的轰鸣声。破坏发生在自然斜坡上，地质环境不利，坡角为28°至31°。 2005年第四季度的降雨估计有100年一遇，是主要触发因素。由于受灾面积大、人口密度低，将人员从危险的滑坡多发区转移到安全地点是最合适的解决方案。为此，绘制了滑坡敏感性图，其中考虑了坡度角度、距断层的距离和坡向。该地图包括四个级别，从低到非常高的山体滑坡敏感性。
Landslides are one of the most dangerous hazards in Vietnam. Most landslides occur at excavated slopes, and natural slope failures are rare in the country. However, the volume of natural slope failures can be very significant and can badly affect large areas. After a long period of heavy rainfall in the fourth quarter of 2005 in Van Canh district, a series of landslides with volumes of 20,000–195,000 m3occurred on 15 December 2005. The travel distances for the landslides reached over 300–400 m, and the landslides caused some remarkable loud booming noises. The failures took place on natural slopes with unfavorable geological settings and slope angles of 28–31°. The rainfall in the fourth quarter of 2005 is estimated to have a return period of 100 years and was the main triggering factor. Because of the large affected area and low population density, resettling people from the dangerous landslide-prone residential areas to safer sites was the most appropriate solution. In order to do so, a map of landslide susceptibility was produced that took into account slope angle, distance to faults, and slope aspect. The map includes four levels from low to very high susceptibility to landslides.