Flowslide Triggering in Volcanic Soils: Role of Stratigraphy and Bedrock Exfiltration
Flowslide Triggering in Volcanic Soils: Role of Stratigraphy and Bedrock Exfiltration
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火山土壤中的流动滑坡触发：地层学和基岩渗漏的作用
DOI：
10.1061/9780784483701.014
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Buscarnera, Giuseppe
中科院分区：
文献类型：
--
作者：
Lizárraga, José J.;Li, Xiang;Buscarnera, Giuseppe
降雨引发的山体滑坡对城市社区和基础设施构成重大风险。瞬时降雨、非饱和土壤特性和空间变化的地形相结合，使其难以在大面积上预测。这一贡献描述了一个计算框架，以评估区域景观的滑坡敏感性。为了这个目的，一个案例研究的描述，其中超过40个浅flowslides被触发后48小时的连续降水超过9平方公里的区域。已经提出了几种假设来解释边坡不稳定性的广泛分布，例如土壤液化、分层引起的孔隙压力脉冲、基岩渗出和先前的水文条件等。在这里，使用现有的现场和实验室数据来约束输入参数，不同的模型方案进行了测试，以反分析事件的空间和时间发生，即（1）在均质沉积物中渗透引起的边坡破坏，（2）在非均质边坡中渗透性差异介导的破坏，以及（3）在均质土壤剖面中基岩弹簧引起的边坡不稳定性。每种情况下进行评估，通过比较计算的敏感性地图和时间演变的不稳定地区对滑坡库存。结果表明，地层效应可以成功地捕捉到观测到的滑坡源区的分布。最后，每个场景的优点和局限性进行了讨论，并建议为今后的分析。
Rainfall-induced landslides pose significant risks to urban communities and infrastructure. The combination of transient rainfall, unsaturated soil properties, and spatially varying topography makes them difficult to forecast over large areas. This contribution describes a computational framework to evaluate landslide susceptibility over regional landscapes. To this aim, a description of a case study is presented, in which more than 40 shallow flowslides were triggered after 48 h of continuous precipitation over a region of 9 km2. Several hypotheses have been proposed to explain the widespread distribution of slope instabilities, such as soil liquefaction, pore-pressure pulses due to layering, bedrock exfiltration, and antecedent hydrologic conditions, among others. Here, using available field and laboratory data to constrain the input parameters, different model scenarios are tested to back analyze the spatial and temporal occurrence of the events, namely, (1) slope failure caused by infiltration in homogenous deposits, (2) failures mediated by permeability contrasts in heterogeneous slopes, and (3) slope instabilities caused by bedrock springs within homogeneous soil profiles. Each scenario is evaluated by comparing the computed susceptibility maps and the temporal evolution of unstable areas against the landslide inventory. It is shown that stratigraphy effects can capture successfully the observed distribution of landslide source areas. Finally, the advantages and limitations of each scenario are discussed, and recommendations for future analyses are proposed.
火山碎屑沉积物中土壤滑移-泥石流引发过程的观测和模拟：Sarno 1998 事件
影响因子：
4.6
作者：
G. Crosta;P. Negro
通讯作者：
P. Negro
索马-维苏威火山周围的火山灰火山碎屑沉积物滑坡敏感性评估：地球物理测量在土壤厚度测绘中的应用
DOI：
--
发表时间：
2006
期刊：
影响因子：
--
作者：
P. Vita;D. Agrello;F. Ambrosino
通讯作者：
F. Ambrosino