6:15 PM - 7:30 PM
[HCG35-P04] Three-dimensional models of alluvial plain considering sedimentary facies: an example of Kumamoto Plain
Keywords:alluvial plains, borehole database, continuities of lithology, The Kumamoto Plain, sedimentary facies, three-dimensional geological model
The Kumamoto Plain distributed in the Kumamoto Prefecture, Kyushu Island, is located in a downstream area of the Shira-kawa and Midori-kawa rivers originating from the Aso Caldera. Alluvial deposits in this area include the Shimabarakaiwan Formation and the Ariake Clay Formation in ascending order. Lithofacies of the Holocene Ariake Clay Formation include channel-fills and flood plain deposits of an inland bay area and coastal delta deposits in Shimabara bay (Hase and Iwauchi, 1996). In this study, we characterized the lithological distributions of the alluvial deposits by analyzing borehole data in the Kumamoto Plain, and we applied an improved construction method of a three-dimensional geological model to the alluvial deposits. As a result, the Ariake Clay Formation well continuing from the bay to the inland areas is clearly visualized.