Colluvium supply in humid regions limits the frequency of storm-triggered landslides.

Colluvium supply in humid regions limits the frequency of storm-triggered landslides.
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DOI:
10.1038/srep34438
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发表时间:
2016-09-30
期刊:
影响因子:
4.6
通讯作者:
Constantine JA
Constantine JA
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Parker RN;Hales TC;Mudd SM;Grieve SW;Constantine JA

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由极端降雨引发的浅层滑坡是山区景观的重大危害。浅层滑坡造成的危害取决于滑坡源区崩积物的可用性和强度以及极端降雨事件的频率和强度。在这里,我们调查所需的时间来积累崩积层影响滑坡触发率在美国阿巴拉契亚山脉南部,这可能会影响未来的滑坡灾害。我们计算了283个空洞的破坏潜力,通过比较崩积层深度的最小(临界)土壤深度所需的滑坡开始在每个空洞。我们的数据表明,大多数空心土壤深度接近其临界深度,62%的空心土壤太薄而不能破坏。我们的研究结果,数值模拟的支持下,揭示了滑坡频率在许多潮湿的景观可能是不敏感的预测变化的频率强降雨事件。
Shallow landslides, triggered by extreme rainfall, are a significant hazard in mountainous landscapes. The hazard posed by shallow landslides depends on the availability and strength of colluvial material in landslide source areas and the frequency and intensity of extreme rainfall events. Here we investigate how the time taken to accumulate colluvium affects landslide triggering rate in the Southern Appalachian Mountains, USA and how this may affect future landslide hazards. We calculated the failure potential of 283 hollows by comparing colluvium depths to the minimum (critical) soil depth required for landslide initiation in each hollow. Our data show that most hollow soil depths are close to their critical depth, with 62% of hollows having soils that are too thin to fail. Our results, supported by numerical modeling, reveal that landslide frequency in many humid landscapes may be insensitive to projected changes in the frequency of intense rainfall events.
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