断层上方第四系覆盖层中氡气运移规律的数值模拟

在前人研究的基础上,建立了稳定条件下断层上方第四系覆盖层中氡气的运移方程,给出了相应的边界条件,对断层上方覆盖层中的氡浓度分布进行了数值模拟,并对其影响因素进行了讨论.结果表明,断层上方第四系覆盖层中存在明显的氡浓度异常,其分布与覆盖层的厚度、断层的宽度、氡的扩散系数和对流速度等因素有关.

NUMERICAL SIMULATION OF RADON MOVEMENT IN QUATERNARY OVERBURDEN OVER THE FAULT

On the basis of previous researches, an equation for radon movement in Quaternary overburden over the fault has been established on the assumption that the overburden is stable. The boundary conditions are given in this paper. The numerical simulation of radon distribution in the overburden and the influencing factors are discussed. It is shown that there exists an obvious anomaly in the overburden over a fault, and its distribution is affected by the thickness of the overburden, the width of the fault, the diffusion coefficient of radon, and the convection velocity of radon.