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Relationship between man-made environment and slope stability: the case of 2014 rainfall events in the terraced landscape of the Liguria region (northwestern Italy)

机译:人造环境与边坡稳定性的关系:2014年利古里亚地区露台景观中的2014年降雨事件(意大利西北部)

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摘要

In the autumn of 2014, a series of rainfall events affected several sectors of the Liguria region, triggering many shallow landslides and causing three casualties and severe structural damages. The most intensely unstable area covered 385 km2, in which more than 1600 landslides have been identified. After these events, an airborne Light Detection and Ranging survey was carried out. The survey yielded a high-resolution digital terrain model (DTM) and aerial images that provided a means of identifying and mapping all the occurred landslides. The distribution analysis of slope instabilities highlighted the link with various human activities. In fact, the majority of the detected landslides occurred in man-modified areas. Geospatial and statistical analyses provided the identification of three main anthropic factors: terraces, their level of maintenance and road network. Moreover, they quantified their role in landslide triggering. These factors were not analysed as separate elements, but as a continuous process, overlapping in time, in man-made influence on landscape. The identification of such factors is a key element for a correct behaviour characterization of this landscape towards extreme flash floods events.
机译:2014年秋季,一系列的降雨事件影响了利古里亚地区的几个部门,触发了许多浅层山体滑坡,并造成三个伤亡和严重的结构损害。最强烈的不稳定区域覆盖385 km2,其中已识别出超过1600只滑坡。在这些事件之后,进行了一项机载光检测和测距调查。该调查产生了一种高分辨率的数字地形模型(DTM)和空中图像,提供了一种识别和映射所有发生的滑坡的方法。坡度不稳定的分布分析突出了各种人类活动的联系。事实上,大多数检测到的山体滑坡发生在人修改领域。地理空间和统计分析提供了三个主要拟人因素的识别:梯田,他们的维护和道路网络水平。此外,它们在滑坡触发中量化了它们的作用。这些因素未被分析为单独的元素,而是作为连续过程,及时重叠,在人为影响景观中。识别这些因素是针对极端闪光洪水事件的正确行为表征这种景观的关键因素。

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