Development of the method to investigate the source of mineral oil in the unsaturated soil

本研究开发了平流-弥散方程的反演分析程序和土壤气体中具有曲折性和弥散性的分子扩散系数和努森扩散系数的求取方法。通过对装满干燥土壤、空气和二氧化碳的储罐的实验结果与模拟结果的比较，评价了土壤气中化学成分迁移模拟器的性能。结果表明，模拟结果与实验结果吻合较好。最后，本研究建立了利用土壤气体成分研究成果进行矿物油来源调查的方法。

This study developed a program for inversion analysis of advection -dispersion equations and the method for obtaining molecular diffusion coefficient and Knudsen diffusion coefficient with tortuosity and dispersivity in soil gas. A simulator for the migration of chemical components in the soil gas was evaluated by comparisons between the experimental results with tank, which was filled with dry soils, air and carbon dioxide, and the results of the simulation. As a result, it was verified that the results of simulation were consistent with the experimental results. Finally this study developed the method for investigating the source of mineral oil by using results of researches of gas components in the gas of soil.