Development of new imaging method of hydraulic conductivity structure

地下水运动规律的认识是科学、工程和农业领域的重大问题。我们关注的是地表上的自电位（自然电位），它可以由地下水流产生。在这项研究中，我们开发的数值正演代码计算的地下水流和自然电位分布。本文还构造了一种利用自然电位资料的水工建筑物反问题计算方法。数值可行性研究强烈建议的可能性，以图像的地下水力异质性。然后，我们采用我们的数值方法对自然电位的真实的场数据进行了分析。结果表明，利用自然电位数据可以得到合理的水工建筑物。本文提出的新的自势分析方案将有助于对地下流体流动的认识。

Understanding of groundwater flow pattern is big issue in science, engineering and agriculture. We focus on the self potential (natural electrical potential) on the surface, which can be generated by groundwater flow. In this study, we developed the numerical forward codes for calculations of the groundwater flow and self-potential distributions. An inverse scheme of hydraulic structure by using the self-potential data is also constructed. The numerical feasibility studies strongly suggested the possibility to image the subsurface hydraulic heterogeneity. Then, we adopted our numerical technique for analyzing the real field data of self-potential. As a result, we succeed in getting a reasonable hydraulic structures from the self-potential data. Our new scheme for analysis of self-potential will be helpful for understanding the subsurface fluid flow.