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이민부 이광률 淸州大學校 師範大學 地理敎育學科 2009 淸州地理 Vol.21 No.-
This study deals with the possibility of inverse northward flowing of the higher reach of Chatan river with its tributary Dokseodang river before and earlier time after formation of Cheolwon lava plateau in the late Pleistocene. Some evidences for the change of flowing direction are suggested such that (1) highest terrace(T2) in Dokseodang river are located in the divide level between Chatan and Dokseodang river valleys, (2) levels of gravel layers within fluvial terraces and under lava layers become lowered toward north direction, and (3) bedrocks of these gravels are originated from Mesozoic volcanic rocks named Jijangbong volcanic complex, located southerly than above terrace and lava plateau. It is estimated that location of kernbut near Shintan-ri had been the paleo-geomorphic divide between northward pre- and co-lava Chatan and Dokseodang rivers and present southward Chatan river. This estimation is based on the most narrow width and channel floor composed of exposed bedrock at Shintan-ri reach portion in Chatan river channel. The lava flows have dammed simultaneously both of mouths of the northward flowing Paleo-Chantan and Dokseodang rivers and southward flowing Chantan into Hantan main river, and then formed temporary lava-dammed paleo-lakes in both of them. Resultantly direction of paleo-channel of northward flowing had changed into southward to merge in present Chantan river and to extinct lakes, due to in-valley river capture and constructing divide action by dissection of channel floor and headward erosion. 본 연구는 추가령구조곡에서 차탄천의 상류에 해당하는 독서당천이 용암대지 형성 이전에 차탄천과 분수계로 분리되어 북류했을 가능성을 제시한다. 그 증거로서 독서당천 하류 하안단구면의 역층의 위치가 차탄천과 독서당천의 분수계의 높이에 있다는 점, 하안단구 역층 및 용암대지 하부 역층의 상대비고가 북으로 갈수록 낮아진다는 점, 북쪽에 위치한 용암대지 하부 역층 자갈의 기반암이 남쪽의 중생대 지장봉 화산암체에서 유래한다는 점 등을 들 수 있다. 과거 북류하던 차탄천 및 독서당천과 현재의 차탄천 간의 분수계는 신탄리 북쪽의 kernbut가 위치한 지역으로 판단되며, 그것은 이곳의 곡폭이 가장 좁으며, 하상이 기반암으로 이루어져 있다는 점에서 미루어볼 수 있다. 그 후 용암류가 이들 하천을 덮으면서 북류하던 독서당천과 남류하는 차탄천의 하구를 막아, 일시적으로 양쪽 하천의 하구에서 고호수가 형성되었고, 두부 침식ㆍ개석작용 등으로 곡 중 하천 쟁탈에 의해 분수계가 낮아지면서 독서당천은 차탄천으로 유입되었고, 고호수들은 사라졌던 것으로 추정된다.
추가령 구조곡의 하안 단구 노두 분석: 철원 율리리 독서당천을 중심으로
이민부 ( Lee Min Bu ),이광률 ( Lee Gwang Lyul ) 한국지형학회 2002 한국지형학회지 Vol.9 No.2
Some river terraces are distributed along the Chugaryeong rift valley, esecially between Cheolwon and Jeongok. 4 different leveled terraces are identified in Dokseodang tributary river valley, as a case study area, which flows into upper Chatan main river. T1, highest terrace surface, has relative height 30.5m from present river bed, weathering degree of 2-4 stage, and 5m depth layer of deposition with subangular to subroundedgravel layers of pebble and cobble classes, interbedded with sand layers. The composition of matrix grain size has gravel 86% sand 43.93%, and mud 25.21%. T2,second higher terrace, shows characteristics of 24m relative height, 2m depositional depth with subangular gravels of pebble class and clay layer of 0.4m under gravel one, weathering degree of 2-4 stages of volcanic rocks and 5-6 stages of schists, and matrixcomposition of gravel 22.09%, sand 55.79%, and mud 22.13%. T3, lower middle terrae, shows 13m height, 3m depth gravel layer subangular to subrounded cobble class, 1-2stages weathering degree, and matrix composition with grabel 32.19%, sand 32.90%, and mud 34.90%. Generally, the volume of the clay composition in terrace T1 has higher than those of terraces T2 and T3. The latest age of the lava damming in upper and lower channels in Chatan river was 0.27ma calculated according to previous studies. The incision rate of valley from T1 surface to present riverbed can be approximately0.15m/ka from event, using the values of age 0.27ma and relative height 30.5m fromriverbed.