Morphology of Buried Valleys under a Holocene Alluvial Fan : Reconstruction Based on Geodatabase of the Arakawa, Central Japan(<Featured Articles>Turkey-Japan Joint Conference on Geomorphology)

概要

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The analysis of newly provided geodatabase revealed three-dimensional architecture of buried valley filled with gravelly fluvial deposits under toe of the present Arakawa alluvial fan. Trace of the valleys indicated the confluence of two river systems, one of which is in the Arakawa system and the other in the Tonegawa one. Morphologic and stratigraphic characteristics as well as some age-control data illustrated the geomorphic development of the fan since the Last Glacial lowstand. The stages of valley development correspond with relative sea-level changes and associated geomorphic evolutions at downstream lowlands. The incision of valleys is considered the result of change in river regime which occurred in the earlier phase of the postglacial sea-level rise.
2011-04-25