2005 Volume 46 Issue 2 Pages 79-88
The lowering groundwater level in the confined aquifers and a thick alluvial clay layer is thought as a cause of the large area subsidence. In this research, geo-environmental information such as altitude of B.M., groundwater level, and the thickness of the clay layer in Kanie region was arranged by using GIS.
As a result, the change of the surface altitude in each year was made visible from altitude of B.M., and the place was clarified, where the influence of the subsidence was remarkable. The three-dimensional ground model was made from the geological cross sections and the boring logs of the subsidence observation wells. The stratum boundary depth and the thickness of the clay layer below each B.M. were presumed from the three-dimensional ground model. The calculated subsidence by one-dimensional consolidation analysis was corresponding to the measured subsidence.
