ANALYSIS OF LAND SUBSIDENCE IN THE NOBI PLAIN

Abstract

The land subsidence in the Nobi Plain, central Japan, was examined in relation to groundwater level declining. The authors tried to examine, using several thousands of borehole materials, the complicated system in the groundwater basin which involves the subsurface stratigraphy, soil properties and so on, and to explore pumping amounts of groundwater and the declining process of the groundwater levels from data of water wells during a past few decades in the plain. Using the above results, the authors successfuly obtained the numerical solution appropriate to the land subsidence up to the present, and they estimated the future land subsidence in the plain.