• 한국지형학회지
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• 제18권4호
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• pp.163-175
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• 2011

Slackwater 퇴적물은 범람이 발생되는 동안 유속이 감소되는 지역에 축적되는 미립의 범람 퇴적물이다. 이는 고범람 수문학에서 가장 흔하게 사용되는 고단계(palaeostage) 지시자로서, 과거 범람의 크기와 빈도를 추정하기 위해 국제적으로 수많은 연구에서 이용되었다. 또한 slackwater 퇴적물을 통한 고범람 기록은 범람-가능성 추정치를 개선시키고, 과거 환경 및 수문을 복원하는데 기여하였다. 그러나 이러한 범람 퇴적물을 이용한 국내 연구는 거의 찾아볼 수 없다. 따라서 본 연구는 slackwater 퇴적물을 이용한 고범람 연구에 대한 선행 연구 결과를 정리하고, slackwater 퇴적물의 특성 및 연구 방법론과 국내에서의 연구 가능성에 대해 알아보고자 한다.

• 한국지형학회지
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• 제27권3호
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• pp.1-11
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• 2020

A CIA analysis (A-CN-K and A-CNK-FM ternary diagram) indicates that, unlike the general granitic hills of the Korean Peninsula, the chemical weathering of the granitic grus (sandy regolith) in the eastern Jincheon basin is variable in geomorphic site except the Chuncheon basin. In the study area, there are three types of hills, such as; inner hills, linear isolated hills, and outer hills. The weathered mantles of the outer hills and linear isolated hills are weakly altered, whereas the inner hill, the Bonghyeon profile, shows a stronger chemical loss of the compositions approximating saprolite. There are small differences between the outer hills and linear isolated hills. The Geumwang site is considered fresh rock due to a low lever of alteration, although its sampling profile shows sandy weathering mantles. In the profiles of the Masan and Mugeuks sites, the lower part of weathering mantles has not experienced a significant level of component loss, but the upper regoliths have substantially been modified. The alteration of the hills occurs by chemical loss of CaO and Na₂O. K₂O exhibited little variation at all sampling suites and it has not changed into saprolite.

• 한국지형학회지
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• 제27권3호
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• pp.25-39
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• 2020

This study analyzed the management plan of Seomjin River Chimsil Wetland by identifying landscape changes through aerial photographs analysis and concentrations of sedimentation. Geophysical Landscape Change Analysis showed that vegetation accounts for more than half of the total area. The Barren land and water body was somewhere repeatedly increased and decreased and made an irregular form in the study area. The soil was acidic, and no eurtophication was shown, but it was potential to form wetland. In addition, the research area has been terrestrification of sand bar for a long period of time, forming a soil layer. Although the characteristics of river deposits were shown in the study area, the grain size was a particulate matter, and the sorting was 'very poorly sorted'. In some areas of Seomjin River Chimsil Wetland, sand bars were formed, but most areas were undergoing to terrestrification. Therefore, in order to preserve the riverine area and to serve by a bridge between the land ecosystem and the underwater ecosystem, it is very necessary to remove some vegetation, create a proper waterway, and restore the wetland.

• 한국지형학회지
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• 제28권1호
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• pp.35-50
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• 2021

In this study, we analyzed the changes in the topographical landscape and the sedimentary environment to evaluate the ecological value of the Dongcheon Estuary and protect the wetland, and presented the conservation management method of the Dongcheon Estuary. Based on the result of topographical landscape analysis, agricultural land tended to decrease continuously, and artificial structures gradually increased. Moreover, in sediment analysis, the Dongcheon Estuary showed both the characteristics of river sediments and coastal sediments, and in some areas problems such as acidification and nutritional imbalance appeared. Therefore, in order to protect and manage the Dongcheon Estuary with high ecological value, it is necessary to limit the development around micro topography and minimize the artificial damage in the Dongcheon Estuary. In addition, efforts such as securing facilities for reducing pollutants and freshwater wetlands for pollutants, that flow in from nonpoint pollutants are required.

• 한국지형학회지
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• 제24권3호
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• pp.83-103
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• 2017

Sand deposit with shell units is exposed in Hasa-ri, Yeonggwang-gun, Jeonnam province. We investigated the characteristics of sand sediment topography in the Yeonggwang coastal area to collect evidence of the paleo-environmental change. We performed analysis on particle characteristics, chemical composition, and the age of deposition of sediments. The deposit comprise moderately well sorted medium and fine sand ($1.00{\sim}2.19{\varphi}$). Various sedimentary structures can be observed. Geochemical characteristics change by depth and the degree of variation with depth is small. The results obtained from OSL dating show that sand layers below shell units are deposited 0.32-0.43 ka. As the elevation of the shell unit far mean high water levels or highest high water level, the extensive shell layers could only have been deposited during storm surge conditions. Aeolian processes are discounted due to the size of clasts and the location at which they occur. Results of age dating of the surrounding deposits indicate shell deposits formed after around 300 years age. There is a distinct difference between sedimentary layers including dark brown-black layer. The sedimentary characters such as particle size and geochemistry show difference with depth. It is presumed that depositional environmental in Hasa-ri has changed several times before. This study is expected to contribute to finding an evidence about occurrence of storm surges.

• 한국지형학회지
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• 제24권1호
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• pp.25-38
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• 2017

To investigate the characteristics of sand sediment topography in the Yeonggwang coastal area of Chonnam and to collect evidence of the past extreme events causing coastal flooding, three sites were surveyed among the sediments of Baeksoo-eup Hassari. In this study, the changes of particle characteristics, chemical composition, and the age of deposition of sediments were investigated. The sediments near Baeksoonam Elementary School at the elevation of 10m near the paleo-coastline are estimated to have been deposited at about 3,400 years ago and the grain size of the upper part of the sandy layer is in the range of $2.47-2.11{\varphi}$. The burial age of the sediment layer at Sadeung junction(BSN-B) was about 100 years. Considering the distance from the current coastline, the sands forming the dune are estimated to have been moved or deposited from the nearby area or the other dune on the front side. The mean grain size is observed to be fining upward. Especially, the mean of the upper part is about $2.3{\varphi}$, which is similar to other survey points. The averaged grain size of the lower part of the BSNC (Hasari-1 Gu) was $2.196{\varphi}$ and the upper part was $2.16{\varphi}$. The sorting showed that the upper part was slightly poorer than the lower, and it was difficult to specify the change of the environment. The burial age of the lower layer, which contains shells, was about 300 years. Considering previous studies, this shell layer is presumed to have formed by coastal flooding, such as a storm surge.

• 한국지형학회지
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• 제26권1호
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• pp.41-57
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• 2019

The grain size characteristics of river sediments and the characteristics of bedrock were investigated for the 24km section of the Dong River upstream of the Han River. The bedrock of the study area is various limestone belonging to the Paleozoic Choseon limestone group, and Mesozoic sandstone and conglomerate occur in some areas. Most of the river channel is made of limestone, and most of the river bottom is covered with fluvial sediments. More than 70% of these sediments are sandstone and conglomerate, rather than limestone which forms the basis of the valley. Sediment particles seem to have been supplied upstream of the study area rather supplied from the slope near of the channel. It is difficult to find the statistically significant difference in the shape of the sediment particles of limestones and non-limestones. However, limestones has platy forms rather than block forms, it can be assumed that the limestone was supplied from the surrounding valley wall and transported over a short distance. The particle sizes of DG1~DG2(the upstream section) are decreasing in the downstream direction. However, at DG3, which is a tributary, Jijangcheon, confluence particle size increases and at DG4 particle size increases more. In the case of DG4, it may be influenced by the influx of tributaries, but it also can be supposed as the impact of the large flood in 2002. In the downstream parts(DG5~DG7), the particle size decreases exponentially with distance. The rebound strength of stream sediments and bedrock was measured by using Schmidt hammer. Limestone showed lower rebound strength than non-limestone. According to the results of the sediment and bedrock, it can be seen that the sandstone and conglomerate with high rebound values pass through valley with the relatively low strength limestone. The sediments of limestone were decreased in grain size more rapidly than those of limestone sediments.

• 한국지역지리학회지
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• 제14권4호
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• pp.279-289
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• 2008

본 연구에서는 고령군에 산재하는 지형경관자원을 발굴하여, 그 분포를 지도화 함으로써 지형경관자원의 관리에 기반이 되는 자료를 제공하고, 이를 활용하는 방안을 제시하고자 하였다. 분석결과는 다음과 같다. 첫째, 산지지역에 분포하는 지형경관은 고령읍의 미숭산과 주산, 그리고 덕곡면 노리의 상비리 계곡, 개진면 오사리의 고립구릉 등이다. 둘째, 하천 연안에 분포하는 지형경관은 개진면 부리의 진촌늪, 다산면 호촌리의 호촌늪과 달성습지, 우곡면 봉산리의 봉산늪 등의 자연습지, 고령읍 외리와 개진면 반운리의 보 축조에 따른 인공습지, 개진면 반운리의 곡류 절단에 따른 구하도와 곡류 핵, 고령읍 내곡리와 우곡면 월오리의 하식애, 우곡면 야정리의 넓은 모래톱과 망류하도 등이다. 셋째, 개진면 부리의 진촌늪은 전형적인 범람원의 모습을 갖추고 있고 비교적 보존상태가 양호하며 대도시와의 접근성도 양호하므로 생태공원을 조성하기에 적합하다. 그리고 개진면 반운리에는 탐구학습장을 조성하여 감입곡류의 절단과 연관된 환경변화와 보의 생태학적 순기능을 관찰할 수 있는 기회를 확대하여야 한다.

• 한국방재학회 논문집
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• 제6권1호
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• pp.49-58
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• 2006

본 연구는 미계측이나 자료가 결핍된 유역에서 지리정보시스템을 이용하여 유역의 지형학적 매개변수를 얻어 유도된 지형학적 순간단위유량도에 의한 강우-유출의 특성을 분석하였다. 횡성댐 상류 섬강시험유역에서 얻어진 실측자료를 사용하였고, 직접유출을 분석하기 위하여 가변기울기법을 이용하였다. 아울러 4차 하천유역인 섬강시험유역은 Horton-Strahler의 차수법칙에 따라 일정한 규칙을 가지고 발달한 수계임을 확인하였다. GIUH의 사용에 따른 섬강시험유역의 규모계수 결정식의 변형을 하였고, 유출특성속도는 1.0m/s으로 나타났다. 4차 하천유역인 섬강시험유역의 출구인 매일교수위국과 3차 하천유역의 출구인 소군교와 농거리교수위국에서의 GIUH에 의한 수문곡선은 첨두시간이후의 유역의 저류능에서 약간의 차이를 보이나, 실측값과의 비교에서 잘 일치하였다. 아울러 유역을 보다 세분화하여 적용한 GIUH모형에 의한 수문곡선을 상류유입수문곡선으로 하여 HEC-HMS를 이용하여 수문 추적한 결과가 전체유역을 대상으로 한 GIUH모형에 의한 수문곡선보다 실측치에 잘 일치하였다. 전반적으로 GIUH에 의한 강우-유출해석은 미계측 유역에 사용성이 있는 것으로 평가된다.

• 한국지형학회지
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• 제20권4호
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• pp.15-28
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• 2013

본고는 2012년 11월 14일부터 25일까지 10일간 남미대륙의 파타고니아와 아타카마 지역을 중심으로 한 안데스 산지를 답사한 후 그곳에서 관찰된 지형경관에 대해 지오투어리즘 관점에서 고찰한 것이다. 파타고니아 지형경관은 칠레의 토레스델파이네 국립공원과 아르헨티나의 로스 빙하국립공원에서, 그리고 아타카마 지형경관은 칠레의 산페드로데아타카마를 중심으로 한 지역에서 주로 관찰되었다. 파타고니아는 세계에서 가장 빠른 융기율을 나타내고 있는 곳 중의 한 곳으로 위의 두 개 국립공원에는 반건조지형과 융기지형 그리고 빙식지형이 매우 잘 발달되어 있다. 특히, 파이네와 피츠로이 암봉군은 관입에 의한 화강암 빙식지형의 백미를 보여주고 있어 두 곳 모두 유네스코 세계자연유산으로 등록된 곳이기도 하다. 한편, 아타카마 사막은 악지와 염호, 간헐천 등 사막과 화산경관이 공존해 있는 독특한 지형경관이 발달된 곳이다. 그 이유는 아타카마 사막이 산페드로데아타카마 동쪽의 화산호(弧)와 해성층의 융기로 형성된 대륙붕단 사이의 전호분지에 위치하고 있기 때문이다. 또한 응결응회암 완사면, 선상지면 등으로 형성된 페디플레인이 곳곳의 페디멘트와 어우러져 건조지형의 전형을 잘 나타내 주고 있기도 하다. 파타고니아와 아타카마는 남미판과 태평양판의 충돌로 인해 형성된 안데스 산지가 만든 매우 다양한 지형경관이 발달된 최적의 지리여행지이다.