Hydrogeological and ground-water resource analysis using a geotechnical database |
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| Authors: | Katsuaki Koike Toshiaki Minta Shinya Ishizaka Michito Ohmi |
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| Institution: | (1) Graduate School of Engineering, Kumamoto University, 860 Kumamoto, Japan;(2) Kumamoto City Office, 860 Kumamoto, Japan;(3) Department of Materials Science & Resource Engineering, Kumamoto University, Kurokami 2-39-1, 860 Kumamoto, Japan |
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| Abstract: | An application of a geotechnical database system for primary evaluation of ground-water resources in a sedimentary basin is proposed. The database consists of 1200 borehole logs including geologic columns,in situ test results, ground-water level, water quality data, and resistivity logs. The Kumamoto plain, situated in southwest Japan, is chosen as a study area. The evaluation process consists of two steps: (1) modeling of shapes of water-bearing strata, and (2) modeling of distribution of physical quantity which has some relationship with the porosity of those strata. In step (1), the shapes of upper and/or lower surface of the pyroclastic flow deposits and the andesitic lava were determined, whereas the three-dimensional distribution model of resistivity was constructed from resistivity logging data obtained from 100 boreholes and using the proposed interpolation method in the step (2). An empirical equation between the porosity and the resistivity of the lava was also identified. The integration of two types of model and the empirical equation contributed to an estimate of the total volume of the ground-water under the study area. |
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| Keywords: | Geotechnical database ground water geologic structure porosity resistivity |
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