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首页> 外文期刊>Water resources research >Evolution of soil wetting patterns preceding a hydrologically induced landslide inferred from electrical resistivity survey and point measurements of volumetric water content and pore water pressure
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Evolution of soil wetting patterns preceding a hydrologically induced landslide inferred from electrical resistivity survey and point measurements of volumetric water content and pore water pressure

机译：从电阻率调查和体积水含量和孔隙水压力的点测量推断的水文诱发滑坡之前土壤润湿模式的演变

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摘要

The hydrological state of a hillslope prior to a sprinkling-induced shallow landslide was monitored using electrical resistivity tomography (ERT) along a 47 m long transect, supplemented by local time-domain reflectometry (TDR) and tensiometer measurements. The spatial and temporal evolution of wetting patterns in the soil material indicated attainment of a stationary fully saturated profile in a slope region underlain by shallow sandstone bedrock. The significant decrease in spatially averaged standard deviation of water saturation has not been observed during an earlier failed attempt to trigger a landslide by intense sprinkling. While for the "stable" experiment (no landslide was triggered) water saturation and soil moisture variability were still increasing with time, the "unstable" experiment reached a time-invariant state of high pore water pressures and saturations, until it finally failed. The results indicate that when large and interconnected regions of hillslope are saturated (as confirmed by high volumetric water content and low standard deviation of water saturation), additional water cannot be redistributed to empty drier regions and may eventually enhance local pore water pressure and seepage force, initiating large shear deformation and failure. Accordingly, a transition to such a critical steady state of high average water saturation, associated with low and constant spatial standard deviation, may serve as additional hydro-geophysical indicator for the imminence of a landslide release.
机译：使用电阻层析成像（ERT）沿着47 m长的样条线监测喷洒诱发的浅层滑坡之前山坡的水文状态，并辅以局部时域反射法（TDR）和张力计测量。土壤材料中润湿模式的时空变化表明，在浅层砂岩基岩下的斜坡区域内达到了固定的完全饱和剖面。在较早的尝试通过强烈的喷水引发滑坡的失败尝试中，没有观察到水饱和度的空间平均标准偏差的显着降低。对于“稳定”实验（未引发滑坡），水饱和度和土壤湿度变化仍随时间增加，而“不稳定”实验则达到了高孔隙水压力和饱和度的时不变状态，直到最终失败。结果表明，当大的和相互联系的山坡区域饱和时（如高含水量和低水饱和度标准偏差所证实），额外的水就无法重新分配到干燥的干燥区域，最终可能会增加局部孔隙水压力和渗流力，引发大的剪切变形和破坏。因此，与低且恒定的空间标准偏差相关的向这种高平均水饱和度的临界稳态的过渡可以用作即将发生滑坡释放的附加水文地球物理指标。

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  • 来源
    《Water resources research》 |2013年第12期|7992-8004|共13页
  • 作者

    Peter Lehmann; Francesca Gambazzi; Barbara Suski; Ludovic Baron; Amin Askarinejad; Sarah M.Springman; Klaus Holliger; Dani Or;

  • 作者单位

    Institute of Terrestrial Ecosystems, ETH Zurich, CH-8092 Zurich, Switzerland;

    Institute of Terrestrial Ecosystems, ETH Zurich, Zurich, Switzerland,Applied and Environmental Geophysics Group, University of Lausanne, Lausanne, Switzerland;

    Applied and Environmental Geophysics Group, University of Lausanne, Lausanne, Switzerland;

    Applied and Environmental Geophysics Group, University of Lausanne, Lausanne, Switzerland;

    Institute for Geotechnical Engineering, ETH Zurich, Zurich,Switzerland;

    Institute for Geotechnical Engineering, ETH Zurich, Zurich,Switzerland;

    Applied and Environmental Geophysics Group, University of Lausanne, Lausanne, Switzerland;

    Institute of Terrestrial Ecosystems, ETH Zurich, Zurich, Switzerland;

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