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Northern Kanto Plane has severely been affected by land subsidence due to groundwater abstraction. It is necessary for decision making of abstraction to determine a precisely distribution of groundwater fluctuation due to groundwater abstraction in the objective area. Finite element method is used to determine how the groundwater fluctuation distributes over the area. It is necessary for calculating in advance to know transmissivities of ground in the whole area. However, it is difficult o get the information from in-situ investigations in the case of the wide area such as the Northern Kanto Plane. In this study, therefore, the transmissivities were identified by means of back analysis of the groundwater level and abstraction data collected for 10 years. GIS has been used for establishing databases which are necessary to perform back analysis and then to visualize the results from the finite element analysis.

Identification of transmissivities in land subsidence area based on back analysis of groundwater flow aided by GIS