담양지역 영산강 지류 하천 퇴적층의 특성에 대한 연구

김종연 ( Jong Yeon Kim ),홍세선 ( Se Sun Hong ) 한국지형학회 2013 한국지형학회지 Vol.20 No.4

The characteristics of deposits formed by the Daejon-cheon and Soobuk-cheon, dissecting the mountains such as Byungpung Mt. and Samin Mt. in western part of Damyang county, Jeonmam province. Results from field survey and bore hole logging by KIGAM are used in interpreting depositional environment, in this study. By the result of deposits near of the channels Daejon-cheon and Soobukcheon, and main channel of Youngsan River, the depth of sediment layers in this area is 4~7m, far thinner than formerly estimated. Weathered material of local rocks forms the base of the sedimentary layers. It can be assumed that the location channel of the Youngsan river has been stable ever since the start of the sedimentary events. Sediment particles of tributaries are angular than those of Youngsan River. Particles are larger and sorting is poor. It is interpreted as mount flash flood deposits. Main sources of sediments at the valley bottom or deposition dominated area are the terrace deposits or slope deposits over the gentle foot-slope or front of surrounding mountains. Some particles show polygonal cracking on the surface originated from the strong chemical weathering, while most of these has high angularity. It means various geomorphic processes operate to produce and transport the particles in this area.Isolated hills within the sedimentary plains are made with weathered materials of local bedrock. In the case of foot-slope of the hills, thin sedimentary layers are found. So it can be concluded that surface features of deposition zone of the Daejon-cheon and Soobuk-cheon is formed by the filling of lower part of the valley and its feature partly controlled by the relief of the weathering front.

전동식 조향장치의 토크&조향각 센서 고정구조 최적화에 대한 연구

김종연(Jong-Yeon Kim),구상훈(SANG-HOON KU) 대한전자공학회 2025 대한전자공학회 학술대회 Vol.2025 No.6

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.

충청북도의 하천 지형 연구에 대한 고찰

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.

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.

양구 수입천 단구의 빙기 퇴적물의 특성에 대한 연구

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.

암석의 특성과 풍화 미지형과의 관계에 대한 연구 -심곡 지역의 셰일과 사암을 사례로-

김종연 ( Jong Yeon Kim ) 한국사진지리학회 2015 한국사진지리학회지 Vol.25 No.2

The weathering forms of sandstone and shale in Simgok, Kangneung, Gangwon are studied with reference to chemical composition of each rock type. Most of sandstone showed roughening of exposed surface due to removal of matrix material between sand particles. In the case of coarse sandstone, no significant weathering forms are found except slightly enlarged pores between particles. Small tafoni or alveoli are found near or along the structural weak lines, like joint, plane and fault which working as a circulation route for water. Various micro-forms, meanwhile found from the shale. Dark stain or black coating on the rock surfaces found from exposed part of shale and only the wall of alveoli survived while most other part of the surface are dissolved or disintegrated. As a result the rock surfaces of the shale resembles those of basalt. This differences in weathering caused by the different chemical composition of shale and sandstone. In the case of silica(SiO2) which is resistant to the chemical weathering composed 88∼95.4% of sand stone while 54.6∼45.2% for the shale. Iron and aluminium oxide showed higher portion for the shale than sandstone. It is not clear whether this difference originated from the rock itself or rate and speed of chemical weathering. However, this difference in chemical composition strongly affect the characteristics of weathering in this area. It also should be noted that the red coatings are found both sand stone and shale. Those of shale are far thicker than those of sandstone and it could be caused influenced by the composition of parent rocks and rate of water circulation within the rock.

아야진 구릉에 분포하는 풍화대와 토양의 특성에 대한 연구

김종연 ( Jong Yeon Kim ) 한국사진지리학회 2015 한국사진지리학회지 Vol.25 No.4

Rock coast and coastal hill at the Ayajin, Goseong, Gangwon province are investigated to provide information on characteristics and forming processes of landscape of granite coastal area. In addition, chemical analysis and OSL age estimation are performed to surface material of the coastal hill. The linear depressions and circular depression which are formed by rock weathering are found from the rock surface of the coast. The linear depression are formed by the weathering along the joint and removal processes of weathered material. The circular depressions are regarded as modified gnamma which is formed by weathering, as those are found from the area where the joints sets not cross and abraded features are not observed. The large rounded rocks which are the modified corestones are found from the surface of the rock platform. It can be concluded that rock coast of this area are weathering-origin landforms which are rocks are exposed weathering front by the processes removal of weathered material rather erosional forms which are eroded by sea water. The samples from the hill of saprolite near of the coast are analysed for chemical composition. The CIA values of samples from the ridge are about 70 which are chemically weathered but far from soil. The soil samples of seaward slope showed over 80 CIA values. It can be proposed that soil which are severely weathered part are removed and sprolite are exposed. Reddish brown soil layer of 20cm in thickness which covers in-situ weathered are found. The layer from the ridge which including rounded pebbles showed 0.38±0.06 ka burial age while slope layers of seaward slope showed 0.29±0.04 ka burial age. The origin of these sediments should be investigated in future.

지형 자원 활용을 위한 지형 분류도 작성 연구 -교암 도폭을 사례로-

김종연 ( Jong Yeon Kim ) 한국사진지리학회 2013 한국사진지리학회지 Vol.23 No.4

Geomorphic characteristics of the coastal area from Gajin to Ayajin are analyzed, in this study. Coastal tors and other residual forms of weathering front found from the coast and it is the influence of bedrock, granite. It can be assumed that landscape evolution in this area is dominated by the removal of weathered materials rather than direct erosion of bedrock(like plucking). Coastal rock hills were island separated from the land when sea level reached current level or higher, they are connected with the land by sandbar afterwards. Weathering pits or pans like tafoni are also be found and spatial distribution of it controled by lithology, especially by the lithologic structures. Some of it, found from the sidewall of inland rocky hills, was fossilized as the coastline progressed to the sea. Remains of aeolian sand dune also formed behind the sand beach. About 10m high coastal terraced forms with deeply weathered saprolite also found from some area. Further studies to find the forming process and age of the terraces should be done. Basalts can be found from Oeum Mt. and Unbong Mt. area. The peaks of the mountains formed by the volcanic activities in tertiary period and have some typical landforms like columnar joints. At the footslope formed with granite showing the tor or other weathered material. Some part of it covered by the block stream originated from the area of basalt. Based on the field studies, geomorphological map of part of this area(Gyoam, 1:25000) is drawn. For the mapping, the area was classified as volcanic, weathering, coastal deposition, aeolian deposition, lacustrine deposition and colluvial by dominant geomorphic processes. Some area was not classified and left as ‘unidentified’.

흉선종과 동반된 저감마글로불린혈증(Good 증후군) 1예

김종연 ( Jong Yeon Kim ),진재용 ( Jae Yong Chin ),이성순 ( Sung Soon Lee ),정훈 ( Hoon Jung ),이현경 ( Hyun Kung Lee ),이혁표 ( Hyuk Pyo Lee ),최수전 ( Soo Jeon Choi ) 대한내과학회 2008 대한내과학회지 Vol.75 No.1S