Construction of Groundwater Cultivation Model for Comprehensive Management of Groundwater in Coastal City Area

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The research results of this research are as follows :1)The state of a hydrological cycle and utilization of groundwater in low land city Osaka was examined, and it is pointed out that the elucidation of the groundwater cultivation mechanism for the whole Osaka basin is indispensable to develop the groundwater management system that enables new utilization of groundwater.2)In order to develop the groundwater simulation model of the Osaka plain, it is necessary to prepare the 3-dimensional geological structure model of the Quaternary layers. The plans (stripping off topographical maps) showing the distribution depth of typical layers from the information on the Quaternary layers around the Osaka plain were made, and the 3-dimensional geological structure model was built based on it.3)The data format of groundwater information was unified, and the database on the Osaka plain was built to link to GIS (Geographic Information System).4)From the analysis based on the statistical simple model, the influence relations between rain/tide-level/pumping and groundwater level were clarified in the Osaka city region, and from the analysis of dissolved components of the groundwater in the shallow aquifers, the cultivation flow paths in the Osaka basin were clarified. They are used as the basic data for the comprehensive management of groundwater.5)In order to establish sustainable groundwater utilization system, holding the wholesome hydrological cycle, a comprehensive management of groundwater is an indispensable system. The groundwater cultivation model for the regional groundwater management in the Osaka plain (broader-based groundwater flow analysis system) was developed, and the applicability to the comprehensive groundwater management of the proposed model is clarified using the accumulated information.