Examination for a cycle of large-scale floods around Lake Biwa from identified with hyperpycnal flow deposits

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The object of this study is a knowing about records of large scale floods in a historical age by using historiographical materials and boring cores at offshore of Lake Biwa. We got some boring cores at offshore of the Echi river mouth and of the Kusatsu river mouth which are at east side of Lake Biwa. Sediment in term of thousands of years in their cores have been lost by erosion of about 100 years ago, so we could not get flood history in the historical age from a geology. Flood records around Lake Biwa were assembled and are listed from historiographical materials.