基于频域电磁定标的河堤砂石入侵检测方法

Q2 Earth and Planetary Sciences
Leading Edge Pub Date : 2023-09-01 DOI:10.1190/tle42090615.1
O. S. Araújo, S. Picotti, R. G. Francese, F. Bocchia, F. M. Santos, M. Giorgi, A. Tessarollo
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引用次数: 0

摘要

由于潜在的水流路径可能导致洪水事件期间的不稳定,沙尘入侵对河流堤防构成重大风险。目视检查是识别关键部分的第一步,但它不能提供有关地下的信息。在这种情况下,电磁感应(EMI)技术是在区域尺度上进行初步分区的有用方法,而广泛用于水文目的的电阻率层析成像(ERT)方法被认为是局部地下成像最可靠的技术之一。位于威尼斯(意大利北部)附近的布伦塔河(Brenta River)堤防内的主要沙子入侵导致季节性洪水期间渗水,并对堤防的稳定性构成严重威胁。ERT和EMI技术以及岩土工程调查是解决问题的最佳选择。电阻率剖面成功地成像了堤坝内部和下方的砂体几何形状,结果与井眼地层具有良好的相关性。第一个多阵列电磁干扰设备(multi - array EMI device)是一种速度更快、成本更低的测量方法,用于绘制附近堤防的进一步异常情况,但结果并不令人满意,因为反向剖面无法成像已知的入侵。另一种线圈间距更大的多阵列EMI器件也进行了测试。尽管它在检测入侵方面表现较好,但结果仍低于预期。然后设计并实施了基于Pearson系数并使用ERT作为参考的校准程序,以在进行反演之前纠正EMI数据。对于两组电磁干扰数据集,该方法都取得了成功,从而获得了倒置段真实的地下电阻率。然后可以恢复并正确解释电磁干扰测量,以估计地下结构。校准电磁干扰数据和获得可与标准ERT剖面相媲美的地下电阻率图像的可能性是经济有效的河流堤防电磁干扰测量以减轻洪水危害的重要改进。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Frequency domain electromagnetic calibration for improved detection of sand intrusions in river embankments
Sand intrusions pose significant risks to river embankments due to potential flow pathways that can lead to instability during flood events. Visual inspection is a first step to recognize critical segments, but it does not deliver information about the subsurface. In this context, the electromagnetic induction (EMI) technique is a useful method for preliminary zoning at regional scale while the electrical resistivity tomography (ERT) method, widely used for hydrological purposes, is considered among the most reliable techniques for local subsurface imaging. A major sand intrusion within the levees of the Brenta River, located near Venice (northern Italy), resulted in water seeping during seasonal floods and posed severe threats to embankment stability. ERT and EMI techniques, along with geotechnical investigations, were the best survey choices to address the problem. Resistivity profiling successfully imaged the sand body geometry within and underneath the levee, and results correlated nicely with borehole stratigraphy. A first multiarray EMI device, which represented a faster and less expensive survey, was deployed to map further anomalies along nearby levees, but results were not satisfactory because the inverted profile failed to image the known intrusion. A second multiarray EMI device, with larger coil spacing, was also tested. Although it performed better in detecting the intrusion, results were still below expectations. A calibration procedure based on Pearson's coefficients and using ERT as a reference was then devised and implemented to correct the EMI data prior to carrying out inversion. The procedure was successful for both EMI data sets, leading to realistic subsurface resistivity in the inverted sections. EMI measurements could then be recovered and interpreted correctly to estimate subsurface textures. The possibility of calibrating EMI data and obtaining subsurface resistivity images comparable to standard ERT profiling is an important improvement for cost-effective EMI surveying of river embankments to mitigate flood hazards.
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来源期刊
Leading Edge
Leading Edge Earth and Planetary Sciences-Geology
CiteScore
3.10
自引率
0.00%
发文量
180
期刊介绍: THE LEADING EDGE complements GEOPHYSICS, SEG"s peer-reviewed publication long unrivalled as the world"s most respected vehicle for dissemination of developments in exploration and development geophysics. TLE is a gateway publication, introducing new geophysical theory, instrumentation, and established practices to scientists in a wide range of geoscience disciplines. Most material is presented in a semitechnical manner that minimizes mathematical theory and emphasizes practical applications. TLE also serves as SEG"s publication venue for official society business.
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