Drowned topographies in the near shore bottom of Yuftsu Plain, Hokkaido

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As the results of the survey carried out by members of Japanese Hydrographic Office, in 1958, the author found the drowned river delta and drowned beach ridges in the near shore bottom of Yufutsu Plain, Hokkaido District.There is present river delta on the estuary of Mu River in the eastern part of Yufutsu Plain. The topography resembling to this river delta exists on the n earshore bottom of 10 to 20 meters deep, off the estuary of Mu River. The author thought that this delta-like topography was the drowned river delta, because abrasion and deposition concerning the present sea level are limited to the shallower than 10 meters.There are many sand ridges on the nearshore bottom from 10 to 30 meters deep, in front of Tomakomai Low Land. Great sand ridge extends from the estuary of Abira River to the southeastward and this sand ridge joins at the estuary of Abira River to beach ridge from which many beach ridges radiated to the northwest trend.Accordingly, the author interpreted that these many sand ridges were drowned beach ridges.
日本第四紀学会の論文