The Ripley Landslide is a small (0.04 km2), 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. © 2020 The Authors. Near Surface Geophysics published by John Wiley & Sons Ltd on behalf of European Association of Geoscientists and Engineers.

中文翻译：

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4 维电阻率层析成像连续、近实时监测影响加拿大不列颠哥伦比亚省交通基础设施的滑坡

里普利滑坡是不列颠哥伦比亚省汤普森河谷的一个小型（0.04 平方公里）、缓慢移动的滑坡，威胁着两条国家铁路线的正常运行。该地区的斜坡倒塌对铁路基础设施、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工程勘察和目视检查已经转向侵入性更小、成本更低且耗时更少的方法，包括地球物理学。我们描述了一种新型电阻率层析成像系统在监测滑坡中的应用。该系统提供近实时地电成像，结果通过调制解调器远程传送，避免了昂贵的重复实地访问的需要，并能够近乎实时地解释四维电阻率断层扫描数据。在这里，我们展示了电阻率层析成像监测的结果，以及吸力、电阻率、水分含量和连续监测单频全球导航卫星系统站之间的现场传感器衍生关系。四维电阻率断层扫描数据使我们能够监测电阻率的空间和时间变化，进而监测水分含量和土壤吸力。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响应的相当大的季节性变化，这些变化无法仅通过查询天气和传感器数据来预测，提供对 Ripley 滑坡现场活跃的地下过程的新见解。© 2020 作者。近地表地球物理学由 John Wiley & Sons Ltd 代表欧洲地球科学家和工程师协会出版。