• Journal of Korea Water Resources Association
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• v.33 no.5
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• pp.611-622
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• 2000

In this study, MODFLOW model is used to analyze the groundwater flow system of Seoguipo area in Cheju island, The final parameters of permeability coefficient and storage coefficient of target area can be obtained by trial and error method using the measured data of pumping rate as initial values. And it is found that the applicability for groundwater flow system is reflected well from the simulation result of the model. Seoguipo area spring water is thought to appear by relatively stable groundwater recharge below EL. 400m according to head distribution through the analysis of observed data considering topographic and geological characteristics, Lee's study(996), and the simulation result. Also it is known that point II, III, and VI show relatively large velocity vectors, and groundwater flows through the movement path which is distributed in various directions of I, II, III, IV, V, VI, and VIl form the result of velocity vector analysis using head distribution result values to analyze the groundwater flow path under unsteady flow condition.dition.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1420-1424
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• 2006

제주도는 연 평균 강우량이 전국 평균의 1.5배에 해당하는 다우지역이다. 그러나 화산섬으로서의 특수한 지형 및 지질구조 때문에 지표수가 거의 발달하지 않았으며, 이러한 수문지질여건으로 인하여 수자원의 대부분을 지하수 개발에 의존할 수 밖에 없어 용수 수요량의 증가를 충족시키기 위한 지하수 개발이 가속화되어 왔다. 그러나 지하수의 과다개발 등으로 지하수의 부존량은 점차 감소할 수 밖에 없는 실정이며, 제주도의 투수성이 높은 지질과 토양으로 지하수 오염에 취약해 최근 수질기준을 초과하는 지역이 늘어나고 있는 실정이다. 이에 제주 당국은 국제자유도시특별법 규정에 권장대상 빗물이용시설에 대한 시설비 보조에 관한 사항 등을 정하여 우수이용을 권장하고 있다. 본 연구에서는 제주도지역의 강우패턴과 세대별 생활용수량 자료를 조사 분석하여 효율적인 가정용 우수 이용 시스템으로서 갈수기에도 안정적으로 용수를 공급받을 수 있는 저류탱크의 크기 및 우수배관의 관경결정 기법을 개발하고 수질의 안정화를 위한 우수수질 안정화 기법을 제시하였다. 우수이용 시스템의 설계를 위하여 개발한 모형인 DDP, DOS 모형을 이용하여 강우 및 용수의 기초자료가 비교적 풍부한 제주도 지역에 적용함으로써 국내의 다른 산간지역과 도서지역에서도 본 시스템의 적용이 용이하게 될 수 있을 것으로 판단되며, 본 시스템 및 시스템 모형화에 대한 지속적인 연구를 통하여 보다 경제적이고 안정적인 시스템 설계가 가능한 범용적인 모형의 개발을 할 수 있을 것으로 사료된다.

• The Journal of the Petrological Society of Korea
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• v.6 no.1
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• pp.1-18
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• 1997

Andesitic pyroclastics and lava flows are deposited as a part of composite volcanoes by Cretaceous volcanic activity in Geojae Island, off the coast of Korea. The andesitic pyroclastics are composed of tuff breccia and lapilli tuff minor intercalated tuff. Lava flows are divided into dense and porphyritic andesite containing phenocrysts of plagioclase, pyroxene, and/or hornblende. The andesitic rocks represent charactersitcs of carc-alkaline BAR association with basalt, basaltic andesite, andesite, and dacite to rhyolite. Major element variations of the volcanic rocks show that $Al_2O_3$, total FeO, CaO, MgO and $TiO_2$ decrease with increasing $SiO_2$ but $K_2O$ and total alkalis increase, and represent differntiation trend of calc-alkaline rock series. In spider diagram, contents of Sr, K, Rb, Ba, and Th are relatively high, but contents of Nb, P, Ti and Cr are low. These petrochemcial characteristics are similar to those of rocks from island arc or continental margein related to plate subduction. Chondrite-normalized REE patterns of volcanic rocks are paralle to subparallel, with LREE enriched than HREE, and show gradual increase of negative Eu anomaly from basalt to dacite and rhyolite, suggesting comagmatic fractional crystallization with minor effects of assimilation and magma mixing. Andesitic rocks are assumed medium-K orogenic andesites that formed in the tectomagmatic environment of subduction zone under normal continental margin arc.

• The Journal of the Petrological Society of Korea
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• v.26 no.2
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• pp.99-112
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• 2017

Geoheritage is designated to preserve geodiversity of geological and geomorphological cases. Geotourism is an extensive activity that aims at the understanding of geology and earth's history for the geoheritage and for developing regions through preserving the geodiveristy of geoheritage. Igidae-Oryukdo is geosite of Busan National Geopark and its visitors are expected to grow rapidly. Accordingly, for the effective use of the geosites, The development and application of geotourism is required. This study suggests that tuffacious sedimentary rocks, hornblende megacrysts-bearing dike, copper mine, marine potholes should designated as the central points for advanced learning stage; volcanic breccia, sea caves, sea cliffs, wavecut platform, tor and islands as the central points for basic learning stage. Based on this central points, this study established concepts for getourism in this study area at basic and expert level for individual and family tourists, and also small or large groups such as school students.