Effect Of Spatial Uncertainty Of Unsaturated Zone Permeability Coefficient On Cl- Migration

In order to study the effect of spatial uncertainty of soil parameter in unsaturated zone on contaminant migration, Permeability coefficient was chosen as a typical soil parameter to be researched. Bayesian method was used to deal with permeability coefficients and Monte-Carlo method was used to simulate spatial uncertainty of permeability coefficients. Numerical model of HYDRUS-1D was used to simulate the contaminant migration in the unsaturated zone taking spatial uncertainty of permeability coefficient into account. And Cl-. was chosen as the contamination. The result was that: The distribution of contamination concentration presented a significant uncertainty, and compared with the case of ignoring spatial uncertainty of permeability coefficients in unsaturated zone, it is closer to the actual situation. Meanwhile, a suggestion about the value of initial concentration in numerical simulation of groundwater is given combining the results.