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首页> 外文期刊>Journal of Applied Geophysics >Improvements in crosshole GPR full-waveform inversion and application on data measured at the Boise Hydrogeophysics Research Site
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Improvements in crosshole GPR full-waveform inversion and application on data measured at the Boise Hydrogeophysics Research Site

机译：井间GPR全波形反演的改进及其在博伊西水文地球物理研究站点测得的数据的应用

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Crosshole ground penetrating radar (GPR) tomography has been widely used and has the potential to improve the obtained subsurface models due to its high spatial resolution compared to other methods. Recent advances in full-waveform inversion of crosshole GPR data show that higher resolution images can be obtained compared to conventional ray-based GPR inversion because it can exploit all information present in the observed data. Since the first application of full-waveform inversion on synthetic and experimental GPR data, the algorithm has been significantly improved by extending the scalar to a vectorial approach, and changing the stepped permittivity and conductivity update into a simultaneous update. Here, we introduce new normalized gradients that do not depend on the number of sources and receivers which enable a comparison of the gradients and step lengths for different crosshole survey layouts. An experimental data set acquired at the Boise Hydrogeophysics Research Site is inverted using different source-receiver setups and the obtained permittivity and conductivity images, remaining gradients and final misfits are compared for the different versions of the full-waveform inversion. Moreover, different versions of the full-waveform inversion are applied to obtain an overview of all improvements. Most improvements result in a reducing final misfit between the measured and synthetic data and a reducing remaining gradient at the final iteration. Regions with relatively high remaining gradient amplitudes indicate less reliable inversion results. Comparison of the final full-waveform inversion results with Neutron-Neutron porosity log data and capacitive resistivity log data show considerably higher spatial frequencies for the logging data compared to the full-waveform inversion results. To enable a better comparison, we estimated a simple wavenumber filter and the full-waveform inversion results show an improved fit with the logging data. This work shows the potential of full-waveform inversion as an advanced method that can provide high resolution images to improve hydrological models.
机译：跨孔地面穿透雷达（GPR）层析成像技术已被广泛使用，与其他方法相比，它具有较高的空间分辨率，因此具有改进获得的地下模型的潜力。井间GPR数据全波形反演的最新进展表明，与常规的基于射线的GPR反演相比，可以获得更高分辨率的图像，因为它可以利用观测数据中存在的所有信息。自从将全波形反演首次应用于合成和实验GPR数据以来，通过将标量扩展到矢量方法，并将阶跃介电常数和电导率更新更改为同时更新，对该算法进行了显着改进。在这里，我们介绍了新的归一化梯度，它不依赖于源和接收器的数量，从而可以比较不同的井间勘测布局的梯度和步长。在博伊西水文地球物理研究站点获得的实验数据集使用不同的源接收器设置进行了反演，并对获得的介电常数和电导率图像，剩余梯度和最终失配进行了比较，以用于不同版本的全波形反演。此外，应用了不同版本的全波形反演以获得所有改进的概述。大多数改进可减少测量数据和合成数据之间的最终失配，并减少最终迭代时的剩余梯度。剩余梯度幅度相对较高的区域表明反演结果的可靠性较差。最终的全波形反演结果与中子-中子孔隙度测井数据和电容电阻率测井数据的比较显示，与全波形反演结果相比，测井数据的空间频率要高得多。为了更好地进行比较，我们估计了一个简单的波数滤波器，并且全波形反演结果显示出与测井数据的拟合度更高。这项工作显示了全波形反演作为一种先进方法的潜力，该方法可以提供高分辨率图像以改善水文模型。

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