• 한국측량학회지
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• 제19권3호
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• pp.273-281
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• 2001

GSIS와 AHP법을 이용하여 삼척지역을 대상으로 산사태 발생 가능성을 분석하였다. 산사태를 유발하는 많은 인자들 중에서 경사도, 경사방향, 지질, 토양, 임상자료들은 기존의 지도자료를 이용하여 입력하여 데이터베이스를 구축하였다. 연구대상지역의 환경적ㆍ지리적 특성을 고려하여 산사태를 유발하는 인자를 결정하였으며, AHP법을 적용하여 유발인자들에 대한 입력값을 결정하였다. 산사태가 발생할 가능성이 있는 지역은 산사태 유발인자들로 만들어진 각각의 레이어를 중첩함으로써 작성되었다. 마지막으로 작성된 도면을 실제 산사태가 발생한 곳과 비교함으로써 산사태 유발인자들이 산사태 발생에 미치는 영향을 알아보았다. 그 결과 삼척지역에서는 토양과 지질적 요소가 가장 많은 영향을 미쳤다는 것을 알 수 있었다.

• 한국제4기학회지
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• 제17권2호
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• pp.13-14
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• 2003

It is generally well known that Quaternary is characteristic geologically in terms of glacial and interglacial repeats and their associated unconformity formation. This paper deals with the first finding of the characteristic and significant meaningful unconformity between Holocene and late Pleistocene, which implies submergence and emergence of the tidal sedimentary basin along the western coastal zone of Korea during interglacial stage(IOS-5e) and glacial time(IOS-2). The stratigraphy of intertidal deposits in the Haenam Bay, western coast of Korea shows two depositional sequence units (Unit I of Holocene and Unit II of late Pleistocene) bounded by an erosional surface of disconformity. The disconformity is related to the latest Pleistocene sea-level lowstands (probably during the LGM). The Unit II is interpreted as intertidal deposit showing tidal sedimentary structures and crab burrow ichnology and has two parts (the upper part and the lower part) showing different lithology and character. The upper part of Unit II shows characteristic subaerial exposure features (emergence) and its related lithology. Such subaerially exposed upper part (more or less 4m to 5m in thickness) is characterized by yellow-brownish sediment color, cryoturbat-ed structure, crab burrow ichnofacies and high value of shear strength. Geochemical and clay mineral analyses of the upper part sediments also indicate subaerial exposure and weathering. In particular, very high value of magnetic susceptibility of the upper part in comparison to that of the lower part is interpreted as pedogenetic weathering during the subaerial exposure period.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2005년도 공동학술대회 논문집
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• pp.117-122
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• 2005

본 연구의 목적은 경기도 포천군 창수면 오가리 일대에서 복합검층기법을 통해 암상과 물성, 파쇄대간의 상관성을 분석하는데 있으며, 적용된 기법은 시추공영상촬영, 부유식 PS검층, 전기, SP, 자연감마, 밀도, 공경검층이 실시되었다. 검층결과에서 암상패턴, 파쇄대부근, 관입암에 의한 반응이 현저히 대분되고 결과적으로 지하수의 유동을 가능케 할 수 있는 파쇄대는 $67{\sim}69m$ 부근에 존재하는 것으로 해석된다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.306-309
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• 2004

The susceptibility of landslides and the effect of landslide-related factors at Penang in Malaysia using the Geographic Information System (GIS) and remote sensing data have been evaluated. Landslide locations were identified in the study area from interpretation of aerial photographs and from field surveys. Topographical and geological data and satellite images were collected, processed, and constructed into a spatial database using GIS and image processing. The factors chosen that influence landslide occurrence were: topographic slope, topographic aspect, topographic curvature and distance from drainage, all from the topographic database; lithology and distance from lineament, taken from the geologic database; land use from Landsat TM (Thermatic Mapper) satellite images; and the vegetation index value from SPOT HRV (High Resolution Visible) satellite images. Landslide hazardous areas were analysed and mapped using the landslide-occurrence factors employing the probability-frequency ratio method. To assess the effect of these factors, each factor was excluded from the analysis, and its effect verified using the landslide location data. As a result, land 'cover had relatively positive effects, and lithology had relatively negative effects on the landslide susceptibility maps in the study area. In addition, the landslide susceptibility maps using the all factors showed the relatively good results.

• 자원환경지질
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• 제32권1호
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• pp.1-11
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• 1999

In the last decade, the supply of natural aggregates has been continuously increased due to the other types of aggregates. In general, aggregates constitute 70-80% of the total volume of concrete, so the quality of aggregates is main factor controlling physical characteristics of concrete. For this reason, physical properties of aggregate according to different rock types were studied. The majority of crushed aggregates is taken out of granite, gneiss, sandstone, andesite, basalt and so forth. The physical properties of these rock types were tested and most of them fell within the acceptable limit on the base of Korean standard regulation. The major lithology of the crushed aggregates is granite and gneiss, both of which are marked for more than 50% of total lithology thpes in Korea. A to the physical properties of granite, the high specific gravity coincides with low porosity, low absorption ratio, while the abrasion and soundness index show, in general, no specific trend. It has been assumed that slight differences of the physical properties of granite aggregates are related with those of the mineral composition, grain size, and so on. In comparison to granite, the physical properties of gneiss have little correlation one after another. This trend is related to different mineral composition, grain size and typical sheet fractures typically prevailing in the texture of gneiss. Spatial pattern of physical properties shows that high specific gravity of granite coincides only with low porosity and absorption ratio in all provinces except Cheolla province, and high specific gravity of gneiss coincides with low porosity and absorption ratio only in Cheolla and Gandwon provinces.

• 지질공학
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• 제12권2호
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• pp.127-135
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• 2002

시추공영상자료와 시추조사에서의 RQD자료 및 완전파형음파검층에 의해 측정된 탄성파속도를 이용하여 각 암상에서의 탄성파속도와 RQD와의 상관관계를 검토하였다. 탄성파속도와 절리틈과의 상관관계는 유성일대의 화강암과 팔당일대의 호상 편마암에서 높은 상관성을 보인 반면, 사북일대 퇴적암에서 상관성이 없는 것으로 나타났다. 사북지역의 퇴적암에서는 상관성이 없고, 특히 누적 절리틈이 0∼20mm구간에서 탄성파속도 분포의 분산이 크게 나타나며, 이는 탄질 세일의 파쇄구간이 넓게 분포하여 절리틈 크기의 측정에 무리가 있었을 것으로 추측된다.

• 자원환경지질
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• 제25권4호
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• pp.463-477
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• 1992

The study area consists of sedimentary and volcanic rocks of Gyeongsang Supergroup, granitoid intrusives, and hornfelses around the granitoids. Granitoid intrusives occur in small stocks in Nijeon-ri, Uggogri, and Yul-ri area. The masses in Nijeon-ri and Uggog-ri are hornblende-biotite granodiorite, biotite granodiorite respectively, and Yul-ri mass is biotite granite. Surrounding sediments of these masses were thermally metamorphosed and contact aureoles were formed. The studied granitoids are considered to be formed by sequential crystallization-differentiation from calc-alkalic granitoid magma. Metamorphic minerals occurring in contact aureole are chlorite, actinolite, epidote, and biotite. Diopside and hornblende are observed in small amount in some lithology around contact aureole. The lithology of contact aureole is predominantly silty and sandy, and characteristic metamorphic minerals were poorly developed because of low temperature metamorphism. Low temperature in contact aureole could be deduced from the facts that the intrusions were small size, shallow depth, low temperature, and rare movement of volatiles from magma.

• Geosciences Journal
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• 제22권6호
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• pp.1027-1039
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• 2018

Seismic attributes are often used to identify lithology and evaluate reservoir properties. However, interpretation based only on structural attributes and without knowledge of the Vp/Vs ratio can limit the ability to evaluate changes in heavy oil reservoirs. These limitations are often due to less obvious impedance differences. In order to investigate pieces of evidence of a heavy-oil shaly-sand reservoir from seismic data, besides geochemistry, we studied seismic attributes and characterized the reservoir using seismic stack data and well logging data. The study area was the Muglad rift basin in South Sudan. We conducted a seismic complex analysis to evaluate the target reservoir. To delineate the frequency responses of the different lithological units, we applied the spectral decomposition method to the target reservoir. The most unexpected result was continuous bands of strong seismic reflectors in the target reservoir, which extended across the borehole. Spectral decomposition analysis showed that the low-frequency zone of 25 Hz dominant frequency was consistent with instantaneous attributes. This approach can identify lithology, reveal frequency anomalies, and filter the stacked section into low- and high-frequency bands. The heavy-oil reservoir zones exhibited velocity attenuation and the amplitude was strongly frequency dependent.

• 한국제4기학회지
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• 제21권2호
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• pp.56-57
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• 2007

• 한국지역지리학회지
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• 제9권2호
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• pp.169-179
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• 2003

답압으로 인하여 등산로에 발생하는 난투수층의 특성과 형성요인을 규명하기 위하여 한라산 석굴암코스와 다랑 쉬오름 등산로에서 토양의 압밀 상태와 물리특성을 조사하였다. 토양경도를 비롯하여 건조밀도와 고상 비율은 대체로 등산로 중앙에서 가장 높고, 가장자리로 가면서 점진적으로 감소하여 자연사면에서 최저치를 보인다. 즉 모든 등산로에서 토양의 압밀화가 진행됨으로써 등산로 중앙부에 난투수층이 출현하고 있다. 난 투수층의 형성에는 등산객의 답압뿐아니라 지형, 지질, 토양, 식생과 같은 환경요인이 관여하고 있다. 지형조건으로서 등산로의 배와 출현위치는 답압의 강도에 차이를 일으킬 뿐 아니라 우세작용에 의한 표토의 유실과 지표류에 의한 토사의 운반 퇴적을 통하여 난투수층의 형성에 관여한다. 또한 토성을 지배하는 지질 및 토양조건은 토양의 물리특성을 통하여 등산로의 압밀화에 영향을 미친다. 반면에 식생은 난투수층의 형성에 직접 관여하기보다는 등산로의 확대속도에 작용함으로써 난투수층의 규모에 차이를 가져온다.