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RISS 인기검색어
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- 저자 : 김종연 ( Jong-yeon Kim ) (검색결과 193 건)
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해안 풍화지형의 기원과 성격 고찰-풍화와지 내의 암분과 암체의 화학조성 분석을 통하여-
김종연 ( Jong Yeon Kim ),양동윤 ( Dong Yun Yang ),김종욱 ( Jong Wook Kim ),신원정 ( Won Jeong Shin ) 한국지형학회 2014 한국지형학회지 Vol.21 No.3
Various weathering pits are formed on the surface of granitic rock mass at coastal area of Korea. Changes in chemical composition of rock mass, characteristic of weathering pit and forming processes are not clear yet. Chemical characters of weathering pit and rock are analyzed in this study. Especially, the samples were collected from the summit part of the hill which was a part of weathering front, rock wall where the weathering pits(tafoni) are formed and rock meals which deposited at the bottom of weathering pit by granular disintegration from the inside walls of tafoni. Samples were analyzed with XRD and XRF method. The mean value of chemical alteration index(CIA) is found highest from the samples of rock meal while the lowest value found from the top of the hill. The chemical composition of the samples from the top of the hill suggests that these samples have experienced not only removal of specific material by chemical weathering but also re-crystalization or deposition by evaporation of water contains Ca and Na. Quartzite and feldspar are found as dominant materials of rock meal, however gypsum, anhydrite and other clay minerals, like illite and kaolinite, are also been identified. So it is concluded that the rock meal of the study area could be originated from the material formed by chemical weathering. Meanwhile, the weathered material might be removed by granular disintegration caused by freeze and thaw cycle of infiltrated water from snow and expansion of gypsum.
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해안 암체와 내륙 암체부의 풍화 와지 사이의 암석 강도 차이에 대한 연구
김종연 ( Jong Yeon Kim ) 한국지형학회 2015 한국지형학회지 Vol.22 No.4
The chemical composition of samples from abandoned cliff and coastal rocks at Munam, Gosung, Gangwon province are analysed. Weathering pits are found at the top and surface of abandoned cliff and these forms are inactive in terms of active physical and chemical weathering. So these forms can be regarded as relict forms rather than active. The tafoni and weathering pits are found from the coastal rocks which are actively being weathered and eroded by sea water and splash. The rebound values are measured at 5 points at and around the abandoned cliff with Schmidt hammer. The results show that the coastal rock has higher rebound values than abandoned cliff. It can be assumed that coastal rock is composed with more resistant rock than abandoned rock cliff. Weathering intensity of each samples can be compared with various weathering indices which can be calculated using chemical composition. In this study, the CIA, most frequently used index in geomorphological literatures, showed only weak difference between the samples. The CIA value of the coastal rock is lower than those of abandoned cliff. However, the difference between two groups is very small. PIA shows similar pattern while the WIP and CPA show similar patterns with larger differences. In the case of WIP, the value of coastal rock is highest and cliff and rock meal are follows. It means the coastal rock is most fresh in terms of chemical weathering while the rock meal is severely weathered. This pattern shows good match with rock rebound values. It is assumed that this pattern is not result of current weathering and weathered material removal processes which is most active near of the sea. It can be concluded that the abandoned cliff had experienced similar weathering environment to coastal rock. After it was abandoned, weathered part of the cliff experienced relatively slow erosion processes and preserve the weathered materials, while weathered part of coastal rock is eroded continuously by sea water and relatively fresh parts are exposed to surface. This results are support the result from previous study from the coast of Yellow sea.
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김종연 ( Jong Yeon Kim ),김창환 ( Chang Hwan Kim ) 한국지형학회 2012 한국지형학회지 Vol.19 No.2
Satae cheon, a tributary of the Suip cheon in Yanggu, Gangwon province, is an international river extended to North Korea. Most of drainage basin area of the river was the fierce battle field during the Korean War (1950-1953) and hard to access as it located between the MDL (Military Demarcation Line) and the CCZ (Civilian Control Zone: about 10km south from MDL), By the restriction of access to the sites, most of natural landscape have been well conserved except limited use for military activities, Even the landfoms in that area were not studied, except the government`s heritage reports, Satae Cheon`s channel follows the Imdang fault line(N-S) to Satae-ri and flow to west to the Dutayeon area, The river meanders along geological structure or weak line at the Dutayeon area, The meandering channel was shorten by the meander cut which linked the thalweg line of meander loop ant the meander neck. As a result of this cut, the river cliff formed by the Satae cheon became the part of newly formed channel bed and the S-forms are formed. After the channel route stabilized, channel incised the rock with large potholes and undulating walls were formed. The channel width changes from 1m to 10m with restriction of the undulating walls, so this part can be regarded as inner channel or inner gorge. From the point of planar forms it also can be slot-type canyon.
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김종연 ( Jong Yeon Kim ) 한국지형학회 2011 한국지형학회지 Vol.18 No.3
The landforms based on granite and basalt in Gosung, Gangwon province were analysed. Some part of this area experienced volcanic activities while most of the area was experiencing erosion of weathered mantle(saprolites) of mesoic granites during cenozoic period. Two different lithologies affect the mode of landscape evolution. The basalt covers the mountain tops as a ``cap rock`` with flat surfaces. It shows relatively fresh rock surface with cliff or steep slops at the boundary with weathered granite. The blocks detached from the cliff accumulated at the foot of the cliff(talus) or moved and filled the valley(block streams). These debris slopes cover the deeply weathered granites. In the case of Oeum Mt. and Duibaekjae, the number of point of origin of the basalt flow is not clear. The orientation of blocks from block stream coincides with slope aspects and it can be assumed that the bolcks were moved by solifluction. The landscape change of the block streams are dominated by removal of weathered material from beneath of the valley rather than removal of bedrock blocks themselves.
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서해안의 화강암 암체 지형 발달에 대한 연구 -반발 강도와 화학 조성 특징을 중심으로-
김종연 ( Jong Yeon Kim ),양동윤 ( Dong Yun Yang ),신원정 ( Won Jeong Shin ) 한국지형학회 2014 한국지형학회지 Vol.21 No.4
Rock rebound values and chemical compositions of Gamak island at Sangha, Gochang, Jeollabuk do are analysed as a part of geomorphic survey of that area. Some corestones are formed by deep weathering found from the summit of rock mass of Gamak island, while the rocks a part of weathering front are exposed at the foot of the island. Rebound values of rock increase toward coastal plain, so summit would be weak in resistance to erosion. It can be assumed that chemical weathering is more active at the summit by the chemical index of alteration and changes in chemical composition ratio. However it should be mentioned that the samples are taken from the surface of the rock mass that more fresh part will be exposed when the weathered parts are removed. The chemical composition and CIA values of the polygonal cracks found from on the surface of weathering rind showed that this part has values between those of the summit and the footslope. The bottom of weathering rind with polygonal cracks has higher CIA value than those of the surface. Though it supports the result from the Bisul Mt., there also difference in the ratio of SiO2. It looks caused by the difference in weathering environment and chemical difference in parent rock. In summary Gamak island is the remnants of weathering front after removal of weathered material. The removal processes are more active at the footslope where the coastal processes are stronger than the summit.
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