科研之友
微信
新浪微博
Facebook
分享链接
摘要
A numerical technique is presented whereby aquifer hydraulic diffusivities (D) and macrodispersivities () are calculated by linear equations rewritten from flow and solute transport differential equations. The approach requires a GIS to calculate spatial and temporal hydraulic head (h) and solute concentration gradients. The model is tested in Portugal, in a semi-confined aquifer periodically monitored for h and chloride/sulphate concentrations. Average D (0.46 m(2)/s) and (1975 m) compare favourably with literature results. The relationship between and scale (L) is also investigated. In this context, two aquifer groups could be identified: the first group is heterogeneous at the macroscopic scale (solute travelled distances <1 km), but homogeneous at the megascopic scale. The overall scale dependency in this case is given by an equation of logarithmic type. The second group is heterogeneous at the macroscopic and megascopic scales, with a scale dependency of linear type.
- 出版日期2013-5-1
