Process of fluvial terraces and evolution of stream during the late quaternary in the downstream of the Namhangang river

초록

This study estimated the stream evolution process during the Late Quaternary in the downstream of the Namhangang River by analyzing the geomorphogical distribution, formation age and process of the fluvial terraces. Since the upper part of the downstream of the Namhangang River was mainly affected by ground uplifting adjacent to uplift axis of the central Korean Peninsula, stream incision has steadily occurred in the Late Quaternary. Therefore, fluvial terrace T2 formed in MIS 5 or 4 and fluvial terrace T2-r formed by reworking of deposits in MIS 3, have a high altitude above riverbed and are continuously distributed in the upper part. On the other hand, since the lower part of the downstream of the Namhangang River has a low altitude above sea level and is adjacent to coast, stream aggradation occurred in river valley during the periods of form MIS 5 to 4 and form MIS 3 to 2, when sea level had fallen. For this reason, it is estimated that the fluvial terrace T2 is buried under floodplain in the lower part.

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