Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR029221 |
The application of electromagnetic induction methods to reveal the hydrogeological structure of a riparian wetland | |
Paul McLachlan; Guillaume Blanchy; Jonathan Chambers; James Sorensen; Sebastian Uhlemann; Paul Wilkinson; Andrew Binley | |
2021-06-02 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Understanding ecologically sensitive wetlands often require non-invasive methods to characterize their complex structure (e.g. deposit heterogeneity) and hydrogeological parameters (e.g. hydraulic conductivity). Here, electrical conductivities of a riparian wetland were obtained using frequency-domain electromagnetic induction (EMI) methods. The wetland was previously characterized by extensive intrusive measurements and 3D electrical resistivity tomography (ERT) and hence offers an ideal opportunity to objectively assess EMI methods. Firstly, approaches to obtain structural information (e.g. elevation and thickness of alluvium) from EMI data and models were assessed. Regularized and sharp inversion algorithms were investigated for ERT calibrated EMI data. Moreover, the importance of EMI errors in inversion was investigated. The hydrological information content was assessed using correlations with piezometric data and petrophysical models. It was found that EMI data were dominated by the thickness of peaty alluvial soils and relatively insensitive to topography and total alluvial thickness. Furthermore, although error weighting in the inversion improved the accuracy of alluvial soil thickness predictions, the multi-linear regression method performed the best. For instance, an iso-conductivity method to estimate the alluvial soil thickness in the regularized models had a normalized mean absolute difference (NMAD) of 21.4%, and although this performed better than the sharp inversion algorithm (NMAD = 65.3%), the multi-linear regression approach (using 100 intrusive observations) achieved a NMAD = 18.0%. In terms of hydrological information content, correlations between EMI results and piezometric data were poor, however robust relationships between petrophysically derived porosity and hydraulic conductivity were observed for the alluvial soils and gravels. This article is protected by copyright. All rights reserved. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/329750 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Paul McLachlan,Guillaume Blanchy,Jonathan Chambers,et al. The application of electromagnetic induction methods to reveal the hydrogeological structure of a riparian wetland[J]. Water Resources Research,2021. |
APA | Paul McLachlan.,Guillaume Blanchy.,Jonathan Chambers.,James Sorensen.,Sebastian Uhlemann.,...&Andrew Binley.(2021).The application of electromagnetic induction methods to reveal the hydrogeological structure of a riparian wetland.Water Resources Research. |
MLA | Paul McLachlan,et al."The application of electromagnetic induction methods to reveal the hydrogeological structure of a riparian wetland".Water Resources Research (2021). |
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