1999 Volume 41 Issue 4 Pages 253-262
In the center part of Miyazaki City, urbanization is advanced. On the other hand, the observed unconfined groundwater level gradually falls though there is no falling tendency to precipitation. The fall of the groundwater level shows that the hydrological cycle has been changed due to urbanization. However, the relation between the change in the ground cover condition and the change of the groundwater level has not been clarified analytically.
In the present study, it was examined to prove the fall of the groundwater level in the center part of Miyazaki City, which originated in the change of the ground cover condition, by using the percent imperviousness of the area and by the modified tank model. The change of unconfined groundwater level was analyzed for the period from 1982 to 1996 when the percent imperviousness was measured. As a result, it was confirmed that fall of the unconfined groundwater level during the period can be explained by changing only percent imperviousness and using same tank parameter.
