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미호천 퇴적층의 매몰연대에 대한 연구: 정북동 토성과 범람원의 물질을 대상으로
김종연 ( Jong Yeon Kim ),성정용 ( Jeong Yong Seong ) 한국지리학회 2016 한국지리학회지 Vol.5 No.2
Depositional environment changes of drainage basin of Geum River during Pleistocene and Holocene have been studied by some researchers. Previous studies classified fluvial terraces along the channel of Miho river by the relative height from the current river channel. The lower terraces of this area supposed to be formed after the last glacial maximum. However, the burial age of fluvial sediments of Miho river have not estimated using numerical method. Samples for age estimation were collected from the Jeongbuk earth wall and adjacent area. The Jeongbuk earth wall is supposed to be constructed on the natural levee of Miho river. Sand layer forms the basis of fluvial depositional layers of the study area. The fluvial gravel layer, can be found from the channel bed, overlain the basal sand layer and are covered by upper sand and finer particle layer. The burial age of upper sand layer and finer particle layer are estimated as 13.65±2.04ka BP and 4ka BP respectively. At the south-east part of the wall three burial ages are estimated from samples of the lowest part (sand; 9ka), middle part (finer particles; 6ka) and the upper part (sandy: 9ka). The soil wedges are found from clay layer at the bottom of south part of the wall and adjacent floodplain area. The burial age of these layer estimated as 17~12ka BP and it is the time global warming after the last glacial maximum. It was reported that precipitation of that period also increased.
한국전쟁 이후 북한의 청진 도시계획에 관한 연구 - 피오트르 자렘바의 도시계획 방법론을 중심으로-
김종연(Kim, Jongyeon),정인하(Jung, Inha) 대한건축학회 2020 대한건축학회 학술발표대회 논문집 Vol.40 No.2
Right after the conclusion of Korean war at July 1953, North Korean Government started recovering the destructed cities. The Government asked the other Socialist Countries for help of their recovery projects. As a result, Soviet Union provided technics and machineries for recovering Pyeongyang, East Germany designed the masterplan of Hamheung and Poland planed the city of Chongjin. Among them, the urban planning method of Chongjin shows some differences compared to Pyeongyang and Hamheung. The purpose of this study is to analyze the unique urban planning method of Piotr Zaremba used in Chongjin plan and compare it with general planning methods of Socialist Countries used in Pyeongyang and Hamheung.
Influence of Tectonic Uplift on Longitudinal Profiles of Bedrock Rivers : Numerical Simulations
김종연(Jong Yeon Kim) 대한지리학회 2004 대한지리학회지 Vol.39 No.5
기반암 하상 하천의 종단 곡선은 지형 경관 발달의 기본 조건을 형성 함으로서 경관 변화에 강력한 영향을 행사 한다. 하천 종단 곡선은 기후 환경 조건의 변화, 기반암의 물리 화학적 특성, 지각 운동과 같은 변수들에 의해서 그 형태의 변화를 경험하게 된다. 특히 지각 운동의 시 공간적 양상은 지각 운동이 활발한 혹은 활발했던 것으로 알려진 지역에서 종단곡선에 강력한 영향력을 행사 하는 것으로 추론 되어 왔다. 그러나, 현재까지의 기반암 하상 하천에 대한 연구는 기반암 하상 하천의 침식 작용을 통제 하는 변수들에 대한 이해의 부족으로 답보상태를 면하지 못하여 왔다. 현대 지형학의 주요 연구 기법인 컴퓨터를 이용한 지형 발달 시뮬레이션은 지형 발달의 단계들을 파악 하는데 유용한 연구 도구로 활용 되어 왔으나, 기반암 하상 하천의 경우 그 이해의 부족으로 인하여 광범위한 응용이 가능한 모형의 마련에 어려움을 겪어 왔다. 그 결과 기존의 연구들은 단순한 확산 모형을 침식의 기본 모형으로 이용 했다. 본 고 에서는 물리적 침식과정에 기반한 기반암 침식 모형들을 검토 수정한 새로운 모형을 소개 하고 해당 모형을 이용하여 지각운동의 시 공간적 분포와 강도가 하천 종단 곡선에 미치는 영향을 시뮬레이션을 통해 모사하고 논의 하였다. Longitudinal profiles of bedrock rivers play a fundamental role in landscape history by setting the boundary conditions for landform evolution. Longitudinal profiles are changed with climatic conditions, lithology and tectonic movements. Tectonic movement is an important factor controlling longitudinal profiles, especially in tectonically active area where uplift rates are regarded as a major factor controlling channel gradient. However study on bedrock channel has made little progress, because controls over bedrock river incision are yet to be clarified. Previous numerical simulations have used a simple diffusion model, which links together the overall processes of bedrock channel erosion as in other landform evolution models. In this study, previous bedrock incision models based on physical processes (especially abrasion) are reviewed and new modifications are introduced. Using newly formulated numerical model, the role of spatial pattern and intensity of tectonic uplift on changes in river longitudinal profile was simulated and discussed.
오대천 수항 계곡의 산지 하천성 퇴적층 특성에 대한 연구
김종연 ( Jong Yeon Kim ),이상헌 ( Sang Heon Yi ),김종욱 ( Jong Wook Kim ) 한국지리학회 2012 한국지리학회지 Vol.1 No.1
The sediment particles found from depositional landforms at Suhangri, Hajinbu, Gangwon province were analyzed in this study. The samples were collected from the depositional forms located near of Odaecheon. Odaecheon is deeply dissecting the paleozoic sedimentary rocks (mainly sandstone) and formed fluvial terraces along its course. The sediment particles of depositional landforms showed different origin and transport route. The lower terraces near of current channel are formed with well rounded granite gravels while higher depositional forms at the foot of the slope are formed with sub angular - sub rounded sandstone gravels with clay matrix. In addition, the thickness of the landforms found less than 10m. So it should be pointed that overall feature of the landform is not decided by the depositional processes of stream but the surface feature formed by erosional processes. It is also found from the slope of the mountain that the gullies on the slope are the main erosional and depositional agents. The sediment particles formed by mechanical weathering or deposited by other processes are transported through the gully. The particles found from the bottom of the gully showed similar roundness and lithology with depositional forms at footslope. It means that sediment particles at the area transported from upslope by the gullying rather than upstream by the fluvial processes. So, it should be mentioned that the depositional forms at this area have different sediment link with slope or upstream reaches, though relative height form the channel is similar.
김종연 ( Jong Yeon Kim ) 한국지리학회 2016 한국지리학회지 Vol.5 No.1
Previous studies on fluvial landforms in Chungcheongbukdo (Province) are reviewed in this study. Various micro-forms, like pothole and grooves, are found from channel bed of mountain streams incising granite area of Sobaek mountain range. However only the forms at Hwayang valley area were studied. Fluvial terraces can be found from the Danyang area, mid reach of the Nanhangang (River). Lower terrace of this area are regarded as fill terrace, while upper terraces are weathered strath terrace. There are some proposed hypothesis on the age and forming processes of terraces, but further scientific analysis on the chemical composition of weathered sediment and burial ages are needed. Number of abandoned channels are formed by meander cut along the head and mid reach of Dalchen (River), a tributary of Namhangang. Information on the burial age of the sediment can contribute to the studies on the landform change of Sobaek mountain range. Abandoned palaeo-channel and terraces can be found from the Chogangcheon (River) in Yeongdonggun, southern part of Chungcheonbukdo. There are previous studies on fluvial terraces along the Mihocheon (River), the forming age and processes of terrace are reported recently.
김종연 ( Jong Yeon Kim ),신원정 ( Won Jeong Shin ) 한국지리학회 2014 한국지리학회지 Vol.3 No.1
There are some previous studies on the sedimentary deposits of glacial period in Korea. Most of these deposits are identified as loess or loess like aeolian deposits based on physical characteristics, while chemical composition of these deposits caused debate on the origins and the natures. The characteristics of the fluvial terrace deposits found from Suip river, Bangsan, Yanggu-gun, Gangwon-do which the burial age of its particles belong to MIS 6, are analyzed using granulometric studies and geochemical analysis in this study. The result from XRF used to find chemical composition and weathering related indices, while XRD results are used to identify the rock foorming minerals and clay minerals. The color of the deposits showed similarity with previously reported loess lays, however these are coarser and far poorly sorted than the loess. These deposits are located at illite zone by the chemical composition and some layer affected by the post-depositional disturbance caused by additional supply of unweathered material. The quartz peaks are dominant for all samples. For the clay minerals, illite peaks are stronger than those of kaolin. It must be the effect of climatic characteristics ever since the deposition event of the area. The strong feldsapr peaks are also found and it could be the result of postdepositional disturbances.