Four-dimensional electrical resistivity tomography for continuous, near-real-time monitoring of a landslide affecting transport infrastructure in British Columbia, Canada
Four-dimensional electrical resistivity tomography for continuous, near-real-time monitoring of a landslide affecting transport infrastructure in British Columbia, Canada
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DOI：
10.1002/nsg.12102
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发表时间：
2020-04-29
影响因子：
1.6
通讯作者：
Donohue, Shane
中科院分区：
文献类型：
--
作者：
Holmes, Jessica;Chambers, Jonathan;Donohue, Shane
Ripley滑坡是不列颠哥伦比亚省汤普森河谷的一种小型(0.04公里(2))缓慢移动的滑坡，威胁着两条国家铁路线的服务能力。这一地区的斜坡坍塌对铁路基础设施、陆地和水生生态系统、公共安全、社区、当地遗产和经济产生了负面影响。这推动了对现场监测的需求，近年来，用于监测基础设施资产的传统岩土调查和目视检查已经转向侵入性更小、成本更低、时间密集度更低的方法，包括地球物理。介绍了一种新型的电阻率层析成像系统在滑坡监测中的应用。该系统提供接近实时的地电成像，通过调制解调器远程传送结果，避免了昂贵的重复实地访问，并能够近实时解释四维电阻率层析成像数据。在这里，我们介绍了电阻率层析成像监测的结果，以及由现场传感器得出的吸力、电阻率、含水率和连续监测单频全球导航卫星系统站之间的关系。四维电阻率层析成像数据使我们能够监测电阻率的空间和时间变化，进而监测水分和土壤吸力的变化。这些模型揭示了复杂的水文地质路径，以及地下对不断变化的天气条件的反应的相当大的季节变化，这不能仅通过询问天气和传感器数据来预测，从而为里普利滑坡现场活跃的地下过程提供了新的见解。
The Ripley Landslide is a small (0.04 km(2)), slow-moving landslide in the Thompson River Valley, British Columbia, that is threatening the serviceability of two national railway lines. Slope failures in this area are having negative impacts on railway infrastructure, terrestrial and aquatic ecosystems, public safety, communities, local heritage and the economy. This is driving the need for monitoring at the site, and in recent years there has been a shift from traditional geotechnical surveys and visual inspections for monitoring infrastructure assets toward less invasive, lower cost, and less time-intensive methods, including geophysics. We describe the application of a novel electrical resistivity tomography system for monitoring the landslide. The system provides near-real time geoelectrical imaging, with results delivered remotely via a modem, avoiding the need for costly repeat field visits, and enabling near-real time interpretation of the four-dimensional electrical resistivity tomography data. Here, we present the results of the electrical resistivity tomography monitoring alongside field sensor-derived relationships between suction, resistivity, moisture content and continuous monitoring single-frequency Global Navigation Satellite System stations. Four-dimensional electrical resistivity tomography data allows us to monitor spatial and temporal changes in resistivity, and by extension, in moisture content and soil suction. The models reveal complex hydrogeological pathways, as well as considerable seasonal variation in the response of the subsurface to changing weather conditions, which cannot be predicted through interrogation of weather and sensor data alone, providing new insight into the subsurface processes active at the site of the Ripley Landslide.