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Geomorphic Processes of the Terraces at Lower Reach of Yeongpyeong River in Chugaryeong Rift Valley, Central Korea  

Lee, Min-Boo (Department of Geography Education, Korea National University of Education)
Lee, Gwang-Ryul (Institute of Education, for National Unification, Korea National University of Education)
Kim, Nam-Shin (Institute of Education, for National Unification, Korea National University of Education)
Publication Information
Journal of the Korean Geographical Society / v.40, no.6, 2005 , pp. 716-729 More about this Journal
Abstract
In the Yeongpyeong River, one of the branches of Hantan River, there 4 fluvial terraces are identified. During the Quaternary, lava flow from Hantan River had gone 4.5km into upstream Part of the Yeongpyeong River and damed its entrance, and resultantly its lower basin had become a lava-damed paleolake. This study deals with fluvial terrace surface classification, stratigraphic analysis, deposits analysis, and OSL age dating in from Gungpyeongri to Seongdongri in lower reach of Yeongpyeong River, in order to identify Seomorphological Process of the terrace landforms relating to duration of lava-damed paleolake. Terrace surface T4, named Baekeuiri Formation, has been located under Jeongok lava layer to indicate pre-lava river bed. Terrace surfaces T3 and T2 are supposed to be formed during paleolake time, based on $3{\~}4m$ thick sand deposits including pebble and cobble layers, and clay and silt layers intersected with sand ones in nearly horizontal bedding. Terrace T1 is estimated to be formed as post-lake fluvial terrace after dissection of lava dam, based on the more fresh phase of deposits and very low height from present riverbed. The results of the OSL age dating for the T3 deposit layers indicate approximately $33{\~}40ka$, and still lake phase at that time.
Keywords
lava-damed paleolake; terrace surface classification; lacustrine terrace; fluvial terrace; stratigraphic analysis; OSL age dating;
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Times Cited By KSCI : 1  (Citation Analysis)
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