• 한국대기환경학회지
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• 제30권2호
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• pp.139-149
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• 2014

A new technique, namely the combination of satellite and trajectory analysis (CSTA), for exploring the spatio-temporal distribution information of volcanic ash plume (VAP) from volcanic eruption. CSTA uses the satellite derived ash property data and a matching forward-trajectories, which can generate airmass history pattern for specific VAP. In detail, VAP properties such as ash mask, aerosol optical thickness at 11 ${\mu}m$ ($AOT_{11}$), ash layer height, and effective radius from the Moderate Resolution Imaging Spectro-radiometer (MODIS) satellite were retrieved, and used to estimate the possibility of the ash forecasting in local atmosphere near volcano. The use of CSTA for Iceland's Eyjafjallaj$\ddot{o}$kull volcano erupted in May 2010 reveals remarkable spatial coherence for some VAP source-transport pattern. The CSTA forecasted points of VAP are consistent with the area of MODIS retrieved VAP. The success rate of the 24 hour VAP forecast result was about 77.8% in this study. Finally, the use of CSTA could provide promising results for VAP monitoring and forecasting by satellite observation data and verification with long term measurement dataset.

• 한국토양비료학회지
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• 제8권3호
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• pp.113-119
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• 1975

Volcanic Ash Soils are widely distributed in Jeju island, and constitute the important upland soils which are either presently being cultivated or are suitable for reclaiming. The characteristics of Volcanic Ash Soils according to data made available by previous studies in Jeju and the outside of the country are as following: The most conspicuous mineralogical property is the presence of amorphous mineral colloids. The colloids have large and highly reactive surface to which the common physical and chemical properties are related. Soils are low in bulk density and higher both in porosity and permeability. Accumulation of humus in the upper part of soil is found in great quantity. Cation exchange capacity is high mainly due to high humus content, but the absorbing intensity of ammonium and potassium is weaker than that of crystalline clays. The phosphate absorption coefficient is extremely high and deficiency of minor element may occur both crops and animals. Soils are densely populated with actinomycetes and anaerobic bacteria. Nitrification and activity of urease are distinctly stronger than that of non-Volcanic Ash Soils.

• 한국지구과학회지
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• 제33권3호
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• pp.280-293
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• 2012

다양한 지질학적 분화 강도에 따른 백두산 화산분출물의 확산 특성과 이들 분출물이 한반도에 미치는 영향을 분석하기 위하여 대기역학모형 WRF (Weather Research and Forecasting)와 확산모형 FLEXPART를 이용하여 수치실험을 실시하였다. 연구 대상일은 화산재 유입이 예상되는 2010년 10월 21일의 종관장이며, 방출 후 48시간 동안 화산재의 이동을 분석하였다. 백두산 분화 후 한반도에 유입되는 강하화산재의 크기는 0.05 mm 이하가 대부분을 차지하며, 큰 입자는 확산에 의한 이동이 작기 때문에 유입가능성이 크지 않았다. 분화강도에 따른 화산재의 이동 특성을 보면, 분화강도 차이에 따른 입자의 분포도의 차이는 크지 않으나, 수밀도의 차이는 크게 나타났다. 한반도 내 도시별 화산재의 침적량 분석에서 화산재가 기류를 타고 동해에서 유입되고 태백산맥의 차폐효과에 의하여 한반도 동쪽에 위치한 강릉, 부산의 침적량이 초기에 증가하는 경향을 나타내며, 지역별 침적량은 일시에 급격하게 증가할 수 있다.

• 한국지반환경공학회 논문집
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• 제17권9호
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• pp.29-35
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• 2016

Being mostly made up of highly permeable basalt and volcanic ash soil, Jeju Island's lithosphere characterizes its streams to be dry, flowing only when precipitation is happening. Under this condition, this research was motivated to identify the need of conservation of underground water, which is taking up most of (84% of) Jeju's water usage, and made an attempt to reduce the permeability of stream beds so that it can replace underground water and be used instead. To this end, this study suggested a simple method to make dry streams to carry water all-year-round by reducing permeability of stream floor. The experiment of permeability was performed on the porous basalt and compared it with that of same basalt with volcanic ash soil and Jumunjin sand layer added on top. The results showed a dramatic decrease in permeability of water when both volcanic ash soil and Jumunjin sand is were layered on top of porous basalt. Despite being gained in a controlled environment with a simple test, this result may provide a realistic and effective method of preserving Jeju Island's underground water which ultimately is a method of resolving water related issues.

• 한국환경과학회지
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• 제23권3호
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• pp.527-532
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• 2014

According to the analysis of volcanic observation data around Korean peninsula, the activities of volcano increase continuously. For example, the volcanic eruption of Mt. Sakurajima is an example, and Mt. Baekdu can be another example potentially. In these regards, developing unified system including realtime prediction and 3D visualization of volcano ash are important to prepare the volcanic disaster systematically. In this technical report, an interactive simulator embedding dispersion algorithm and 3D visualization engine is developed. This system can contribute to the realtime prediction of volcanic disaster scientifically.

• 지질공학
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• 제28권2호
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• pp.259-266
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• 2018

백두산 분화시 북풍 또는 북동풍이 발달하게 되면 국내에 화산재가 확산될 가능성이 있으며, 화산재에 의해 민감한 영향을 받는 상수도 시설의 관리기준이 필요하다. 본 연구에서는 국내 상수도 시설의 관리기준 수립을 위해 국외의 다양한 화산에 대해 분야별 피해사례를 조사하였으며, 이를 바탕으로 상수도 시설의 피해 요인을 퇴적, 흡착/침착, 마모로 나누어 예상되는 피해 정도를 유형화하였다. 또한 위험평가 결과를 바탕으로 화산재 퇴적 두께에 따라 상수도 시설의 관리 단계를 4단계로 도출하였으며, 0~1 mm은 VAD(Volcanic Ash Degree) I, 1~3 mm는 VAD II, 3~5 mm는 VAD III, 5 mm 이상은 VAD IV로 제시하였다. 최종적으로 도출된 관리 단계별 경보 기준, 화산재 영향, 피해 대응 절차 및 방안 등으로 구성된 상수도 시설 관리 기준(안)을 제시하였다.

• 자원환경지질
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• 제18권2호
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• pp.125-134
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• 1985

치술령 지역(地域)에 분포(分布)하는 화산암(火山岩)은 Ash flow tuff, intrusive welded tuff 및 Diatreme으로 세분(細分)된다. 제삼기(第三紀) 초기(初期)에 분출(噴出)한 Ash flow tuff는 6개(個)의 층(層)(Member)으로 구분(區分)되고, 각층(各層)(Member)의 암상(岩相) 변화(變化)는 암주형(岩柱型)의 Intrusive welded tuff가 화산(火山) 분출(噴出) 화구(火口)였음을 암시(暗示)한다.

• 한국광물학회지
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• 제1권1호
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• pp.32-39
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• 1988

The effect of soil forming factors on the pedogenesis of basaltic volcanic ash soils and the influence of allophane material on soil properties have been investigated on 5 chronosequence soils situated from at the near sea coast up to the foot slope of Mt. Halla in Jeju Island. Time seems to be the important soil forming factor which today differentiates soil of the Island. Songag and Donghong soils developed in lower elevations are older and somewhat less influenced by ash shower. However, soils developed at higher elevations, Pyeongdae and Heugag, are rather younger and strongly influence by the ash. It is also proved that the parent materials are very heterogeneous. They mainly are basaltic with some contamination of acidic volcanic ashes and continental aeolian deposits where a considerable amount of quartz encountered in most soils studied. Many physico-chemical properties of soil, such NaF pH, phosphate sorption power, pH and extractable acidity are parameters to differentiate andepts and non-andeptic soils.

• 한국광물학회지
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• 제1권1호
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• pp.40-47
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• 1988

Mineralogy of sand, silt and clay fractions from the five chronosequence soils of Jeju Island is studied with the X-ray, TEM and SEM techniques. Soils of Songag and Donghong situated at lower elevations are generally developed on relatively of ash or alluvial deposits and contain mainly ferromagnesian minerals and feldspars, with some quartz, mica and volcanic glass. Crystalline minerals are dominant in the clay fraction; halloysite and vermiculite are abundant but small amounts of allophane are present. Clay migration results in well developed ferrigargillan, Soils of Pyeongdae and Heugag located at higher elevations are developed on relatively young volcanic ash with some contamination of continental aeolian dust probably containing quartz which may be come from acid ash shower. The absence of clay illuivation is due to the dominance of allophane. This clay mineral is associated with some gibbsite, imogolite and halloysite.

• 지질공학
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• 제28권2호
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• pp.267-276
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• 2018

화산 폭발 시 발생되는 화산재는 수백 km 떨어진 광대한 지역으로 확산되며, 화산재가 지표수에 유입될 경우 상수도 시설에 피해를 받게 된다. 상수도시설의 경우 우리 국민들이 먹는 식수와 생활용수를 공급하는 시설로서 화산재 피해가 발생되면 수질오염 등의 피해발생으로 상수도 공급 중단 시 사회적 혼란이 야기된다. 그러나 재난관리 매뉴얼을 살펴본 결과 화산재 피해 에 대응하기 위한 상수도시설 매뉴얼 수립이 미비한 것으로 나타났다. 따라서 본 연구에서는 기존에 수립된 화산 및 수질오염 관련 매뉴얼을 분석하여 문제점을 도출하였다. 그리고 신속한 상황판단 및 대응활동을 수행할 수 있도록 상수도시설 매뉴얼(안)의 적용범위, 재난유형, 관련기관 주요 임무 및 체계, 재난유형별 위기상황 시나리오 등의 개선방안을 제시하였다.