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제주도 곶자왈지대의 용암 : No. 4. 병악곶자왈용암 No. 4. Byeongak Gotjawal Lava
송시태 濟州大學校 基礎科學硏究所 2003 基礎科學硏究 Vol.16 No.1
제주도에서 곶자왈이라 부르는 지대는 암괴상 아아 용암류의 특징을 잘 보여주는 “곶자왈 용암(gotjawal lava)"이 놓여 있어 강수가 곧바로 지하수로 유입되는 투수성이 매우 높은 지역이다. 한경-안덕 곶자왈지대에 분포하는 병악곶자왈용암은 평균 1.5km의 폭으로 9.0km를 유동하였다. 병악곶자왈용암의 조직은 클린커-암괴성 조직(clinkery-blocky texture)으로 되어 있는데, 중력과 대력으로 구성되어 있으며 현무암질조면안산암(Basaltic trachyandesite)으로 되어 있다. 병약곶자왈용암이 유동하는 동안 용암판들의 멧돌과 같은 작용으로 인하여 미세력이 형성되었으며, 미세력의 양은 원거리형에 이를수록 증가한다. "Gotjawal" is the terrain which is covered by aa rubble flow and is so permebale that rain water easily penetrates into groundwater. Gotjawal lava of the gotjawal terrain is adopted as an administrative term for the development and preservation of groundwaters. Byeongak Gotjawal Lava was erupted in the Byeongak. Byeongak Gotjawal Lava is distributed in the Hangyeong-Andeog Gotjawal Terrain is 9km long and 2~3km wide. Byeongak Gotjawal lava is consist of trachybasalt. The texture of gotjawal lava is made up of the clinkery-blocky types and large and medium rubbles. The find rubbles might have been formed by millstone effect of moving lava slabs. The content of fine rubbles increases as approaching towards the distal type.
김대철,송시태,유병조 한국수산학회 1987 한국수산과학회지 Vol.20 No.2
본 조사해역 퇴적물의 퇴적양상은 서측의 세립질 퇴적물과 남부의 조립질 퇴적물, 그리고 이 지역외에 세립질과 조립질 퇴적물이 혼합된 지역인 세부분으로 나눌 수 있다. 퇴적물의 분포상태는 서측이 주로 mud이고 남동측은 sandy mud와 muddy sand로 이루어져 있는 반면 최남부에는 사립질의 sand가 분포하는데, 이는 대체로 조류와 해류의 유속 및 유향과 지형적인 특성에 많은 영향을 받는 것으로 보인다. 삼천포와 욕지도 주변의 왜도가 negative skewness인 것은 강한 조류의 영향 때문인 것으로 생각된다. 욕지도 안쪽과 섬진강하구 퇴적물을 C-M diagram에 plot해 본 결과 섬진강하구와 욕지도 동쪽을 제외하고는 대부분 pelagic suspension의 형태로 운반되었으나, 창선도와 삼천포 사이의 수로에서는 예외적인 현상이 나타나는데 이는 강한 조류 때문에 나타나는 winnowing 효과 때문으로 생각된다. 조직표준치의 상관계수가 0.76∼0.92로서 매우 양호한 음의 상관관계를 가진다. Distribution, bathymetry and textural parameters of the bottom sediment deposited between Geoje and Namhae Islands were studied to understand the depositional environment of the area. The study area is divided into three different provinces. Except for the Gwangyang Bay and Changseon Channel, mud dominates in the western part whereas sandy mud and muddy sand prevail in the southeastern part including the eastern area of the Yogji Island. The relict sediment is located in the eastern part of the area. Generally, the Holocene sediment, located in the northern part of the area, is considered to be transported and deposited by a pelagic suspension mode. Influence of strong tidal currents results in some depressions in the vicinity of Changseon Island and the eastern part of the Yogji Island. The Tsushima Warm Current is supposed to affect the southern part of the area. The two parallels sand ridges lying in the southeastern part of the area are covered with very thin Holocene mud. This seems to be caused by the winnowing effect of the current. The similarity between the two directions of the current and the ridges encourages this idea. The boundary between the Holocene and relict sediment, however, lies further south the ridges.
김대신,김봉찬,송시태 한국자연보호학회 2008 한국자연보호학회지 Vol.2 No.2
This study was carried out to offer the raw data for environment conservation by surveying and analysing the vascular plants of Gotjawal terrain which is covered by aa rubble flow in Jeju island. The period of survey was from February 2007 to February 2008 at the site of four Gotjawal terrains. The vascular plants in Gotjawal were consisted of total 616 taxa including 111 taxa of ferns; 124 families, 401 genera, 514 species, 3 subspecies, 55 varieties, and 9 forms. Among the investigated plants, the special plant species based on floral region by Ministry of Environment were 202 taxa including 19 taxa in grade category. Law-protected plants by the Ministry of Environment were 6 taxa such as Quercus gilva, Mankyuya chejuense, Cymbidium nipponicum, and Galeola septentrionalis etc. Also, Korean endemic plants of this area were 8 taxa such as Mankyuya chejuense, Cardamine violifolia, Rubus hongnoensis, and Ligularia taquetii etc.