Prediction of Groundwater Composition Change by the Concentration Ratio Matching Method

Abstract

Time-dependence of chemical composition in groundwater was analyzed by the concentration ratio matching method which provided correlations among chemical compositions. Groundwater samples were collected from a piestic surface water well at 5, -50 days intervals. The correlation number obtained by the concentration ratio matching method decreases with the length of sampling interval, and reaches a constant value at over 100 days.
Assuming that variations of concentrations depend on the grou ndwater flow, the correlation number, Z, can be expressed as a function of time: Z(t)=b1(a+b)-Fal(a+b)exp(ab)t. Experimental data are explained by the above equation. Therefore, this equation can be used to predict chemical composition change caused by the groundwater flow.