Monitoring soil water content and deficit using Electrical Resistivity Tomography (ERT) - A case study in the Cevennes area, France
Monitoring soil water content and deficit using Electrical Resistivity Tomography (ERT) - A case study in the Cevennes area, France
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DOI：
10.1016/j.jhydrol.2009.10.032
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发表时间：
2010-01-15
影响因子：
6.4
通讯作者：
Bouvier, Christophe
中科院分区：
文献类型：
--
作者：
Brunet, Pascal;Clement, Remi;Bouvier, Christophe
在山坡尺度上，地表径流在很大程度上取决于土壤的水分亏缺，即有效孔隙度和含水量之间的差异，整个土壤剖面。本研究的目的是使用电阻率断层扫描（ERT）评估水分亏缺。ERT具有以下几个优势：（i）它不是侵入性的，（ii）它显示出十米或百米尺度的空间格局，（iii）它提供了关于含水量和土壤深度的信息。该研究是在地中海页岩桑迪土壤上进行的，在Cevennes（法国南部），首先，在实验室中分析了电介电系数所依赖的因素（孔隙性质和材料组织、含水量、土壤溶液和温度）。土壤样品被用来推导阿尔奇关系的W和W参数，土壤溶液随时间的变化，以及温度对电导率的影响。然后，这些结果被用来解释ERT在一年中的不同时间在原地。然后将从ERT获得的含水量和缺水量与使用时域反射仪（TDR）进行的当地测量进行比较，比较结果令人满意。本研究的结果表明，测量土壤含水量和水分亏缺，使用电导率的潜力，并描述如何在温度，孔隙度和流体电导率的不确定性影响ERT获得的估计土壤含水量和赤字。(C)2009 Elsevier B.V.保留所有权利。
At the hillslope scale, surface runoff depends to a great extent on the water deficit of the soils, i.e. the difference between the effective porosity and the water content, all through the soil profile. The aim of this study was to assess water deficits using Electrical Resistivity Tomography (ERT). ERT offers several advantages: (i) it is not intrusive, (ii) it exhibits spatial patterns at a decametric or hectometric scale, and (iii) it provides information on both water content and soil depth. The study was conducted on a Mediterranean shaley sandy soil, in the Cevennes (South of France), First, the factors (nature of the pores and organization of the material, water content, soil solution and temperature) on which electrical resistivities depend were analyzed in the laboratory. Soil samples were used to derive the W and W parameters of Archie's relation, changes in the soil solution over time, and the effect of temperature on resistivities. These results were then used to interpret ERT in situ at different times of the year. The water content and water deficit obtained from ERT were then compared with local measurements made using Time Domain Reflectometry (TDR) and the comparison was satisfactory. The results of this study show the potential of measuring soil water content and water deficit using electrical resistivities, and describe how uncertainties in temperature, porosity, and fluid conductivity impact ERT-obtained estimates of soil water content and deficit. (C) 2009 Elsevier B.V. All rights reserved.