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An assessment of ERT as a method to monitor water content regime in flood embankments: The case study of the Adige River embankment
Physics and Chemistry of the Earth, Parts A/B/C ( IF 3.7 ) Pub Date : 2020-09-06 , DOI: 10.1016/j.pce.2020.102930
Alessia Amabile , Bruna de Carvalho Faria Lima Lopes , Annarita Pozzato , Vojtech Benes , Alessandro Tarantino

Stability of flood embankments is strongly affected by the water flow taking place in the saturated and unsaturated soil. Monitoring of the water flow in flood embankments is therefore essential in the context of flood risk management to predict and prevent failures of embankments. Electrical Resistivity Tomography (ERT) is gaining popularity for its ability to monitor water regime in the subsoil more quickly, cost-effectively and on a larger scale compared to traditional geotechnical monitoring systems that rely on local sensors. This paper presents the application of ERT to the monitoring of water content in a flood embankment on the Adige River in Italy. The resistivity profiles obtained from the ERT measurements were converted into water content profiles via a laboratory-derived relationship between resistivity and water content. At the same time, local sensors to monitor pore water pressure were installed in the saturated and unsaturated zone of the embankment and this allowed reconstructing the water content regime in the embankment via inverse analysis of water flow. This offered the chance to benchmark ERT-derived water content against independent indirect measurements of water content in the field.

ERT-inferred water content profiles based on laboratory calibration could capture the water content profiles derived from water flow analysis only qualitatively. This was attributed to artefacts in the ERT data inversion arising from the high contrasts in resistivity between different embankment layers. On the other hand, ERT proved to be a valuable tool to quantify the water content in the soil if field-specific relationship between water content and ERT-measured resistivity is developed.



中文翻译:

ERT作为监测洪水路堤含水量方法的方法的评估:以阿迪杰河路堤为例

在饱和和非饱和土壤中发生的水流强烈影响洪水路堤的稳定性。因此,在洪水风险管理的背景下,监控洪水路堤的水流量对于预测和防止路堤的破坏至关重要。与依靠局部传感器的传统岩土监测系统相比,电阻层析成像(ERT)能够更快,更经济高效地以更大的规模监测地下土壤中的水分状况,因此受到越来越多的欢迎。本文介绍了ERT在意大利阿迪杰河防洪堤中水含量监测中的应用。通过实验室得出的电阻率和水含量之间的关系,将从ERT测量获得的电阻率曲线转换为水含量曲线。同时,在路堤的饱和和非饱和区域中安装了用于监测孔隙水压力的局部传感器,这使得可以通过对水流进行反分析来重建路堤中的含水率状态。这提供了将ERT派生的水含量与现场水含量的独立间接测量基准进行比较的机会。

基于实验室校准的ERT推断的水含量曲线只能定性捕获水流分析得出的水含量曲线。这归因于ERT数据反演中的假象,这是由不同路堤层之间电阻率的高对比度引起的。另一方面,如果开发了水含量与ERT测量的电阻率之间的特定于领域的关系,则ERT被证明是定量土壤中水含量的有价值的工具。

更新日期:2020-09-06
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