Many numerical, hydrological and chemical techniques have been developed to separate each run-off component from discharge. In this study, filter separation method is applied to separate the concentration of water quality of surface and ground-water flow.
The concentration of ground-water flow (
Cg), estimated by this method, seems to be constant during a short period of one or two months. During a long term, however, the value of
Cg varies seasonally. As the concentration of surface flow (
Cs) is influenced by many factors, such as season, water quality, discharge and so on, the value of
Cs varies a great deal. And
Cs can be expressed as various functions of the value of surface flow (
Qs).
We propose here a new method to separate graphically each quality by using the relationship between the water quality (
C) and the ratio of discharge (
Qs/
Q) based on the chemical mass-balance equation. It enables us to separate the quality of
Cg and
Cs, and to estimate its fluctuation characteristics.
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