Two‐dimensional and three‐dimensional resistivity imaging in archaeological site investigation
Two‐dimensional and three‐dimensional resistivity imaging in archaeological site investigation
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考古遗址调查中的二维和三维电阻率成像
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Apostolos Sarris
中科院分区：
文献类型：
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作者：
N. Papadopoulos;P. Tsourlos;G. Tsokas;Apostolos Sarris
在这项工作中，研究了二维和三维非线性反演算法在处理和解释从考古区域收集的电阻率层析成像（ERT）数据中的应用和有效性，该技术使用标准考古勘探设备在相对较短的时间内收集三维极-极层析成像数据。对于二维和三维情况，反演例程基于平滑度约束算法，并且分别使用二维和三维有限元求解器进行正演建模计算。将组合二维反演（准三维）的结果与完整三维反演进行比较。比较了使用极-极阵列收集层析数据的最佳测量方向，以获取考古遗址中常见的三维结构产生的合成数据。还测试了算法在存在噪声数据时的响应。该算法还用于处理从希腊 Sikyon 和 Europos 考古遗址收集的真实数据。合成数据和真实数据的结果表明了三维反演算法在处理层析数据方面的优越性。由于考古特征的三维性质，重建的三维图像不会受到准三维方法中遇到的人工制品的影响。最重要的是，合成数据和真实数据结果都表明，与准三维方法相比，使用全三维反演时，单个勘测方向足以生成有效的三维地下图像，而准三维方法需要使用两个勘测方向才能获得满意的结果。版权所有 © 2006 约翰·威利父子有限公司
In this work, the application and the effectiveness of two‐ and three‐dimensional non‐linear inversion algorithms in processing and interpretation of electrical resistivity tomography (ERT) data collected from archaeological areas are investigated in the framework of a new field technique for gathering three‐dimensional pole–pole tomographic data in a relatively small amount of time using standard archaeological prospection equipment. The inversion routine, for both the two‐dimensional and the three‐dimensional case, is based on a smoothness constrained algorithm and the forward modelling calculations are carried out using two‐dimensional and three‐dimensional finite element solvers respectively. Results of combined two‐dimensional inversions (quasi‐three‐dimensional) are compared with the full three‐dimensional inversions. Comparisons are carried out in relation to the optimum survey direction of gathering the tomographic data using the pole–pole array for synthetic data arising from three‐dimensional structures commonly encountered in archaeological sites. The response of the algorithms in the presence of noisy data was also tested. The algorithms were also used in the processing of real data collected from the archaeological sites of Sikyon and Europos in Greece. The results from the synthetic and the real data indicate the superiority of the three‐dimensional inversion algorithms in processing tomographic data. The reconstructed three‐dimensional images do not suffer from the artefacts encountered in the quasi‐three‐dimensional approach, owing to the three‐dimensional nature of the archaeological features. Most importantly, both synthetic and real data results indicate that a single survey direction is adequate to produce a valid three‐dimensional subsurface image when full three‐dimensional inversion is used in contrast to the quasi‐three‐dimensional approach, which would require that two survey directions be used to obtain satisfactory results. Copyright © 2006 John Wiley & Sons, Ltd.