Evaluation of electrical resistivity tomography (ERT) for mapping the soil-rock interface in karstic environments
Evaluation of electrical resistivity tomography (ERT) for mapping the soil-rock interface in karstic environments
复制标题
评估用于绘制岩溶环境中土壤-岩石界面的电阻率层析成像 (ERT)
DOI：
10.1007/s12665-019-8440-8
复制
发表时间：
2019-08-01
影响因子：
2.8
通讯作者：
Binley, Andrew
中科院分区：
文献类型：
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作者：
Cheng, Qinbo;Tao, Min;Binley, Andrew
石漠化是中国西南喀斯特地区的一个重大威胁。土壤分布的研究有助于保护和恢复该地区普遍存在的脆弱的喀斯特生态系统。与能够评估土壤库存在岩溶环境中的一个基本目标，本研究评估使用电阻率层析成像（ERT）划定土壤-岩石界面。使用合成模型（认识到地下的三维性质），实验进行评估的影响，测量误差和测量配置恢复的接口。反演结果表明，随着测量误差和偶极子间距的增大，土-岩界面的划分精度降低。结果还表明了测量误差的可靠估计的重要性。本文还介绍了ERT在中国西南地区5个暴露剖面的现场应用情况。对于现场数据，三维建模是必要的，以考虑到暴露面。现场实验表明，ERT可以有效地划定土壤和基岩之间的界面，但分辨率可能会受到限制，由于规模的功能或缺乏土壤和基岩之间的对比度。该方法显示出很大的希望，作为一种手段，以非侵入性的方式，土壤-基岩界面，也许更重要的是，量化估计的总土壤储量，因为我们试图量化的脆弱性或恢复力这一重要的景观人为和自然的压力。
Rocky desertification is a significant threat in the karst regions of southwest China. Studies of soil distribution can contribute to protecting and recovering the fragile karst ecosystem that is prevalent in this region. With an underlying aim of being able to assess soil stocks in karstic environments, this study evaluates the use of electrical resistivity tomography (ERT) for delineating the soil–rock interface. Using a synthetic model (that recognizes the three-dimensional nature of the subsurface), experiments are performed to assess the impact of measurement errors and measurement configuration on recovery of the interface. The inverted results show that the accuracy of the delineation of the soil–rock interface decreases with the increase of measurement error and dipole spacing. The results also show the importance of reliable estimation of measurement errors. Field-based applications of ERT at five exposed profiles in southwest China are also reported. For the field data, three-dimensional modelling was necessary to account for the exposed face. The field experiments show that ERT can be effective at delineating the interface between soil and bedrock, but resolution can be limited due to the scale of features or lack of contrast between soil and bedrock. The method shows great promise as a means of assessing, in a non-invasive manner, the soil–bedrock interface, and, perhaps, more significantly, quantifying estimates of total soil stocks, as we seek to quantify the vulnerability or resilience of this important landscape to anthropogenic and natural stresses.