Resistivity imaging of river embankments: 3D effects due to varying water levels in tidal rivers
Resistivity imaging of river embankments: 3D effects due to varying water levels in tidal rivers
复制标题
河堤电阻率成像：潮汐河水位变化造成的 3D 效应
DOI：
10.1002/nsg.12234
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发表时间：
2022
影响因子：
1.6
通讯作者：
Ball J
中科院分区：
文献类型：
--
作者：
Ball J
电阻率断层扫描 (ERT) 由于其地下空间覆盖范围、对含水量等内部状态变化的敏感性以及通过延时 ERT 识别渗漏和其他侵蚀过程的能力，在监测河堤状况方面得到了越来越多的应用。 Two‐dimensional ERT surveys are commonly used due to time and site constraints, but they are often sensitive to features of anomalous resistivity proximal to the survey line, which can distort the resultant inversion as a three‐dimensional (3D) effect.在潮堤中，这些 3D 效果可能是由水位和河水盐度的变化引起的。英国哈德利沼泽的 ERT 监测数据显示了当地水体 3D 影响的潜在证据。综合建模用于量化对潮堤的潜在 3D 影响。模型显示，当在高水位且距电极阵列距离小于 4.5 m、间距为 1 m 时，潮汐环境中会出现 3D 效应（对于所研究的几何形状）。建模中的 3D 效果在微咸水中得到增强，咸水在潮汐环境中很常见，并且电极间距较大。不同的地质、河水成分和模型参数的近似程度预计会对 ERT 数据产生不同程度的 3D 影响，在测量时应考虑这些因素，以尽量减少数据中的伪影。这项研究强调了适当的地电测量设计对于潮堤表征的重要性，特别是近端水体和咸水体。
Electrical resistivity tomography (ERT) has seen increased use in the monitoring the condition of river embankments, due to its spatial subsurface coverage, sensitivity to changes in internal states, such as moisture content, and ability to identify seepage and other erosional process with time‐lapse ERT. Two‐dimensional ERT surveys are commonly used due to time and site constraints, but they are often sensitive to features of anomalous resistivity proximal to the survey line, which can distort the resultant inversion as a three‐dimensional (3D) effect. In a tidal embankment, these 3D effects may result from changing water levels and river water salinities. ERT monitoring data at Hadleigh Marsh, UK, showed potential evidence of 3D effects from local water bodies. Synthetic modelling was used to quantify potential 3D effects on tidal embankments. The modelling shows that a 3D effect in a tidal environment occurs (for the geometries studied) when surveys are undertaken at high water levels and at distances less than 4.5 m from the electrode array with 1 m spacing. The 3D effect in the modelling is enhanced in brackish waters, which are common in tidal environments, and with larger electrode spacing. Different geologies, river water compositions, and proximities to the model parameters are expected to induce a varied 3D effect on the ERT data in terms of magnitude, and these should be considered when surveying to minimize artefacts in the data. This research highlights the importance of appropriate geoelectrical measurement design for tidal embankment characterization, particularly with proximal and saline water bodies.
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