• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2003.03a
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• pp.1-12
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• 2003

지반조사 결과에 의거하여 돌리네와 공동이 존재하는 지역을 구분하여 지역에 적합한 카르스트 형식을 적용, 예측하였다. 특히, 터널이 돌리네 발달 가능성이 적은 백운산 지역을 통과하는 경우에 소규모의 KT-1 ∼ KT-5가 존재하는 것으로 예측되었다. 그러나 설계시 지반조사의 한계성을 인식하고 시공 중에 필요하다고 판단되는 구간에는 막장 전방의 지질상태를 파악할 수 있는 조사를 선 시행하여, 그 결과를 토대로 최종 등급을 결정하여 안전한 시공에 대처할 수 있도록 해야 한다.

• Economic and Environmental Geology
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• v.52 no.3
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• pp.251-258
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• 2019

During the detailed geological survey around the southern Yangsan Fault, we newly found a Quaternary fault outcrop, which cuts unconsolidated sediments. The fault named the Sinwoo site, located in the Sinwoo pasture, Miho-ri, Duseo-myeon, Ulsan metropolitan city, is the first discovered Quaternary fault near the western part of the south Yangsan Fault. In this study, we provide information on characteristics of fault geometry and unconsolidated sediment at Sinwoo site based on the analysis data of topography, drainage, and lineament around the study site. The fault site is situated at pediment slope, but fan-shaped middle terrace, as well as thick sediment exposed at low terrace, indicates that the unconsolidated sediments have been deposited in the alluvial fan environment. The drainage develops to the third-order drainage system, and the first and the second drainage system meet at right angles to each other and form a radial drainage pattern. In addition, the NE-SW direction lineaments can be identified on the basis of the curvature of the river and the step of the topographic relief, running over the Sinwoo site. The fault of $N30-35^{\circ}E/79-82^{\circ}SE$ shows ~ 5.8 m apparent vertical offset and dominantly reverse-slip sense based on slickenline, rotation of pebbles, and drag folding at footwall. However, some discontinuous sediments observed in the footwall are interpreted as fissure-filling materials due to the strike-slip movement. Now, we are under multidisciplinary investigations of additional field survey and age dating in order to determine the evolution of Sinwoo site fault during the Quaternary.

• Spatial Information Research
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• v.14 no.3 s.38
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• pp.285-297
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• 2006

We aim to investigate the morphological and environmental characteristics of royal tombs of Chosun Dynasty by using GIS technique and remotely-sensed data. Most of the royal tombs are located on the banded gneiss and granite and over the south- and east. facing slopes and have altitudinal ranges of 150 to 200 meters. Due to the time gaps, exact locational preferences of the royal families can not be understood at this moment and also proximity to the running water is hard to be quantified. Close examination of Gwangneung indicates that the artificial modification and weathering have severe impacts on the slope and stone artefacts. The results from this research can be useful to preserve the valueless cultural heritages.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.597-601
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• 2009

우리나라 하천의 중류나 상류는 대부분 산지로 되어 있어서 하천경사가 급하고 하상재료가 크며 지질 및 지형적인 영향을 받아 구속사행이 발달 되어 있는 산지하천이다. 산지하천은 홍수 시 만곡수충부 외측에서 홍수위 상승에 따른 범람과 유속 및 소류력에 의한 하상세굴이 발생한다. 특히 강원도는 산지하천을 따라서 도로가 발달되어 있기 때문에 하천피해는 도로피해와 직결되는 경우가 많다. 산지하천 수충부의 홍수피해를 줄이기 위해서는 호우에 따른 하천의 홍수위 및 하상 변동에 대한 자료가 필요하나 산지하천 특성을 고려한 관련 연구가 미흡한 실정이다. 본 연구에서는 산지하천 발달특성을 평가하기 위한 기초연구로서 유역의 면적-고도곡선을 평가하고자 한다. 산지하천은 하상을 구성하는 재료가 모래에서부터 전석에 이르기까지 그 크기가 매우 다양하게 분포되어 있어 일반 모래와 자갈이 주를 이루는 평지하천과 현저히 다르다. 하천유역의 면적-고도곡선은 유역의 지질 발달상을 판단하거나 홍수효과 또는 지형의 침식과 퇴적 등을 분석하는데 유효한 방법이다. 강원도 영동지역과 영서지역을 발원지로 하는 하천의 면적과 고도관계를 조사하였으며 이를 위하여 영서지역은 제1차 하천인 한강과 그 주요 지류 21개 하천, 영동지역은 제1차 하천 6개와 그 지류 3개 하천을 선정하고 무차원 면적-고도곡선을 작성하여 유역의 발달단계를 분석하기 위한 면적고도 발달계수를 정의하였다. 골지천을 제외한 모든 조사대상 하천에서 최대표고의 70%이상인 지역이 전체 유역면적의 10%미만을 차지하여 우리나라 하천유역이 상류의 경우 전형적인 장년기에서 노년기 지형으로 발달한 것으로 확인할 수 있었다. 그러나 유역의 하류지역은 이미 유년기적인 특성을 보이고 있는 것으로 판단된다. 또한 영동 보다는 영서지역 하천이 하류에서 유년기적 특성이 다소 크고 상류는 장년기가 많은 것으로 분석되었다.

• Journal of The Geomorphological Association of Korea
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• v.21 no.4
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• pp.133-147
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• 2014

Reducing the range of target landform, is required to save the time and cost before real field survey in the case of inaccessible landform such as talus. In this study, Weight of Evidence modeling, which is a Target-driven spatial analysis statistics methods, has been applied to reduce the field survey range of target landform. In order to apply the Weight of Evidence analysis, a likelihood ratio was calculated on the basis of the result of correlation analysis between geomorphic factors and GIS information after selection of geomorphic factors regarding talus. A best combination, which has the biggest possibility for Talus Potential Index, was found by using SRC and AUC methods after calculating the number of cases for each thematic maps. This combination which includes aspect, geology, slope, land-cover, soil depth and soil drainage factors, showed quite high accuracy by 74.47% indicating the ratio of real existent talus to potential talus distribution.

• Journal of the Korean Geographical Society
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• v.51 no.6
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• pp.761-777
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• 2016

This study is to suggest landform and environmental problems of border region of N. Korea and China by analyzing results of field work for the Dumangang and the Amnokgang from year 2000 up to year 2016. By the social system in North korea, access of study material is possible with satellite image and published statistical data, but impossible direct data collection. We gathered field work data on landform and environment in border Region of N. Korea and China. Before field survey, we analysed geometrical landform and geology using DEM and digital geology map. We analyzed landform and environmental problems occurring in upper, midstream, and downstream region of the Dumangang and the Amnokgang using field work data. Resultingly, this study will be expected to support as basic data for resonable management on natural resources and empirical research activities on North Korea.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.280-280
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• 2022

급경사지의 붕괴원인은 강수량과 지형적, 지질적 원인 등이 있지만 최근 집중호우 및 홍수사상에서 많은 피해가 발생한 것에서 강수량과 급경사지 붕괴는 밀접한 상관관계를 가지고 있다. 급경사지 붕괴에 대한 많은 선행연구가 진행되었지만 특히, 강우량과의 상관성을 해석하고 기준을 지질과 지형적 특성에 대한 규명을 하고자 노력하였다. 2015년 행정안전부에서는 급경사지 지역의 주민피해를 최소화하기 위하여 주민대피 관리기준을 제시하였다. 주민대피 관리기준에는 계측기준과 강우량 기준으로 나누어 급경사지 하류지역의 주민대피를 위험단계별로 제시하였다. 그러나 최근의 강우가 급격하게 변화하고 급경사지 지역의 많은 피해가 발생하면서 주민대피 관리기준 중 강우기준의 조정에 대한 필요성이 제기되었다. 본 연구에서는 1999년부터 2020년 까지 발생한 급경사지 피해사례를 조사하여 산사태 피해지역의 강우량 자료를 수집하여 지속시간별 강우량과 1,2,3 시간에 대한 연속강우자료를 수집하여 위험단계별 주민대피 강우량을 제시하였다. 기존 2015년도 주민대피 강우기준을 산정시 분석에 적용된 지질별 강우를 고려하여 재산정하여 위험단계별 주민대피 강우기준을 산정하였다.

• Journal of the Korean earth science society
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• v.39 no.2
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• pp.164-177
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• 2018

Even though various geological attractions are distributed domestically, the geological attractions are rarely utilized as field course site. The purpose of this study is to make Seonangbawi area as the field course site after geological investigations are carried out in detail. Seonangbawi is located about 1km southeast from Songjiho beach in Gangwon-do. Seonangbawi area is simply composed of Cretaceous Seokcho granite with the overlay of Quaternary alluvium. Geological field course in the Seonangbawi area will be useful to the student and citizen for developing the knowledge of geological phenomena, such as the formation of granite and minerals, and weathering process. In addition, the student and citizen can develop the knowledge of the geological structures, such as joint (N50E/80NW, N40W/84SW), fault (N42W/83SW), foliation (N32E/54SE), and dyke (N35E/40SE, N26W/63SW), and geographical features, such as tor, taforni, groove, and gnamma in the field. Accordingly, the Seonangbawi area is the best place to learn various geological and geographical phenomena and to discuss the origin of Seonangbawi with limited space.

• Journal of The Geomorphological Association of Korea
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• v.20 no.4
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• pp.51-70
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• 2013

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 Soobuk-cheon, 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.

• Journal of the Korean earth science society
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• v.26 no.7
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• pp.661-667
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• 2005

It was preliminarily considered that Jangdo wetland was a concave landform formed by the weathering of granite intruding Precambrian silicified metasedimentary rocks. Various granite-weathered topography was observed. The formation scenario of Jangdo wetland is as follows. By flood or slope mass movement of regolith, rock fragments were moved to form a low-relief slope landform. As a result, wetland was formed. By analyzing the slope soil and wetland sediment, we conjectured that Jangdo wetland depended on the influence of peripheral slope soil. In these concavelandform environment, the supply of water and organic materials was sustained for a long time to form a organicnondegradable wetland environment. In addition, the plants appropriate to this wetland environment were settled to thicken the wetland. This is how the present Jangdo wetland was thought to be formed.