1987 Volume 1987 Issue 387 Pages 85-94
Unconfined groundwater behavior is generally complex in time and space due to variety of hydrogeological properties in the flow region. It is necessary for the simulation analysis to characterize the uncertainty about the head field and to evaluate the accuracy of observed hydraulic head. In the present paper, assuming statistical homogeneity, the variogram which expresses a spatial structure of the head field was derived analytically from the physical laws. This theoretical variogram was consistent with the variogram that was calculated using observed data. The head fields after a rainfall were stochastically estimated by using the Kriging method and theoretical variogram. It has been clarified from the result that an extent of the role of observed data for the estimation of the head field becomes gradually important more and more through a long-term recession process.
