ABSTRACT In this paper, we propose an enhanced version of the multi‐gradient measurement technique, called full‐range gradient survey, for 2D electrical resistivity tomography. To demonstrate its effectiveness, we conducted numerical simulations and field experiments to highlight the advantages of the new data‐acquisition technique on the traditional electrode arrays and the original multi‐gradient measurement technique. A comparison of the imaging capabilities of the full‐range gradient technique with the dipole–dipole, Schlumberger and multi‐gradient shows that the former inherits all the advantages of the multi‐gradient technique as well as the sensitivity of the traditional three‐ and four‐electrode arrays. The new survey technique has a better pseudo‐section coverage, a much smaller geometrical factor, and less noise contamination than the dipole–dipole survey. It significantly improves the subsurface images of the Schlumberger and original multi‐gradient data. The numerical and field experiments both demonstrate that the full‐range gradient survey can be an alternative to all the traditional electrode arrays and original multi‐gradient surveys of 2D electrical resistivity tomography to obtain better quality and higher resolution images of near‐surface targets.

中文翻译：

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二维电阻率层析成像的全范围梯度测量

摘要在本文中，我们提出了一种用于二维电阻率断层扫描的多梯度测量技术的增强版本，称为全范围梯度测量。为了证明其有效性，我们进行了数值模拟和现场实验，以突出新数据采集技术在传统电极阵列和原始多梯度测量技术上的优势。全范围梯度技术与偶极-偶极子、Schlumberger 和多梯度成像能力的比较表明，前者继承了多梯度技术的所有优点以及传统三、四梯度技术的灵敏度。 - 电极阵列。新的测量技术具有更好的伪截面覆盖率，更小的几何因子，并且比偶极-偶极测量更少的噪声污染。它显着改善了 Schlumberger 和原始多梯度数据的地下图像。数值和现场实验都表明，全范围梯度测量可以替代所有传统的电极阵列和二维电阻率层析成像的原始多梯度测量，以获得更好质量和更高分辨率的近地表目标图像。