抄録
The estimation of spring water discharge is of great importance from the viewpoint of using water resources. Although a number of estimation techniques have been proposed, a simple and reliable method is not yet established. The authors have developed a numerical simulator based on the nonlinear two-hole tank model. The simulator is drived by an optimizer, with which the influencing parameters are systematically searched so that the discrepancy between the measured and calculated discharge is minimized. With this procedure, reliable simulation results can be obtained. The simulator is applied to Ubako hot spring at Hakone volcano. The results showed good agreement with the measured data, in that the discharge of the hot spring is strongly influenced by precipitation, including the fact that it dries up in winter. The authors have also investigated the dynamic characteristics of the hot spring under artificial precipitation. Through various precipitation data, the nonlinear characteristics of the model are made clear.
