• Title/Summary/Keyword: Gampo

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Foraminiferal Characteristics in Mud Deposits of the Southeastern Margin of Korea (한국 남동 대륙주변부 니질대 표층퇴적물의 유공충 특성)

  • Woo, Han-Jun;Choi, Jae-Ung
    • Ocean and Polar Research
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    • v.28 no.2
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    • pp.67-78
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    • 2006
  • Six surface sediments from two offshore transects of Ulsan and Gampo, on the southeastern margin of Korea were taken for sediment and foraminiferal analyses. Sedimentary processes are dominated by reworking and resedimentation from storms in the area off Ulsan and hemipelagic suspension settling in the area off Gampo. Eighty-four foraminiferal species were identified in total assemblages, including 33species of living populations and 9 species of planktonic foraminifera. The characteristics of foraminifera showed differences of offshore environments between Ulsan and Gampo. The number of living species, species diversity and equitability in Gampo offshore area had higher values than those in Ulsan offshore area. However, planktonic/benthic(P/B) ratio showed higher in the Ulsan offshore area. The species diversity indices and P/B ratio indicated that environmental stability and surface-ocean productivity in the Gampo offshore area were relatively higher than the Ulsan offshore area. The difference of species compositions is useful for interpreting the paleoenvironments in mud deposits of the southeastern margin of Korea.

Wet Purification for the Selective Separation of Montmorillonite from Bentonite (벤토나이트로부터 몬모릴로나이트의 선택적 분리를 위한 습식 고순도화)

  • 김완태;채영배;정수복;임정한
    • Journal of the Mineralogical Society of Korea
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    • v.15 no.4
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    • pp.293-304
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    • 2002
  • Wet purification process for the selective separation of montmorillonite from Gampo 13 and 35 bentonite ores was studied using physical processes such as ultrasonic scrubbing, decantation and centrifugation. Ultrasonic Scrubbing of Gampo 13 and 35 bentonite ores was revealed excellent result at 7 wt.% of slurry density and was almost finished within 30 minutes in the sample of Gampo 13 and 10 minutes in the sample of Gampo 35, respectively After decantation, approximately 52 wt.% from the bentonite of Gampo 13 and 64wt.% from the bentonite of Gampo 35 were recovered as purified products and the CEC was reached up to 119.4 meq/100 g and 124.5 meq/100 g, respectively. Particle separation by centrifugation showed that most of the impurity minerals such as quartz and feldspar were removed within the condition of 1,000 rpm.

Community Structure and Biological indicator species of Marine Benthic Algal at Intertidal zone in the Three Areas of the East Coast of Korea (동해안 조간대 3개 지역에서 해조류의 군집과 생물지표종)

  • Jeong, Hee-Dong;Hong, Sung-Eic;Kim, Sang-Woo;Han, Myung-Seog;Jang, Seong-Ho
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.20 no.6
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    • pp.609-618
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    • 2014
  • We have been studied for geographic distribution, dominance and inhabitation characteristics of marine algal species at intertidal zones of Geojin in the northern part of east coast of Korea, Jukbyeon in the middle part and Gampo in the southern part in May and August 2014. For the geographic distribution, the three areas (Geojin, Jukbyeon and Gampo) were a characteristic of the temperate region. Geojin dominated with Ulva pertusa and Chaetomorpha moniligera, Jukbyeon dominated with C. moniligera and Chondria crassicaulis, Gampo dominated with Sargassum thunbergii, U. pertusa and Ectocarpus species. C/P, R/P and (R+C)/P, which can represent the marine algal flora, were 0.85, 2.10, 2.94 in Geojin, 0.58, 3.15, 3.73 in Jukbyeon and 0.80, 3.91, 4.71 in Gampo. As a result of cluster analysis, Those regions were divided in two groups, which were a group A of Geojin and group B of Jukbyeon and Gampo. This result was well matched with Jukbyeon and Gampo shared their temperate region character in the geographic distribution study.

Long-Term Variations of the Sea Surface Temperature in the East Coast of Korea (동해 연안해역 표면수온의 장기 시계열변화)

  • Kim, Sang-Woo;Im, Jin-Wook;Yoon, Byung-Sun;Jeong, Hee-Dong;Jang, Seong-Ho
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.20 no.6
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    • pp.601-608
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    • 2014
  • The purpose of this study was to explore the long-term variability of sea surface temperature (SST) and cluster analysis derived from in-situ data in the coastal oceanographic observation 8 stations (Sokcho, Jumunjin, Donghae, Jukbyeon, Pohang, Janggigab, Ulgi, Gampo) of the East Sea during 1971-2013. As a result of cluster analysis, SST variations in each area could be divided into two groups, which was a group A of Sokcho, Jumunjin, Donghae, and group B of Jukbyeon, Pohang, Janggigab, Ulgi, Gampo. The SST and SST anomalies at Sokcho, Jukbyeon, Pohang and Gampo during 1971-2013 showed the increase-trend with the variations of decadal-scale. Annual SST values also increased remarkably after 1988. The increases of SST for 43 years showed $2.26^{\circ}C$ at Sokcho, $1.99^{\circ}C$ at Jukbyeon, $1.11^{\circ}C$ at Pohang and $0.89^{\circ}C$ at Gampo. In particular, the SST variations of the northern areas were higher than those of southern areas. The seasonal SSTs increased the order of Sokcho-Jukbyeon-Pohang-Gampo in fall and winter and that of Jukbyeon-Sokcho-Pohang-Gampo in spring and summer.

Occurrence of zeolite in the Tertiary Sediments (삼기층(三紀層) 퇴적암(堆積岩) 중(中) 비석(沸石)의 산출상태(産出狀態))

  • Kim, Jong-hwan;Moon, Hee-Soo
    • Economic and Environmental Geology
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    • v.11 no.2
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    • pp.59-68
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    • 1978
  • Of more than 30 varieties of zeolite group minerals, 7 varieties, mordenite, clinoptilolite, natrolite laumontite, stilbite, stellerite and chabazite are identified in Korea, whereas mordenite and clinoptilolite occur in Miocene sediments of small Yonil tertiary basin, east coast of Korea. The basin consists of three separate groups of sediments called Janggi, Gampo and Haseo, which are not correlated stratigraphyically yet. Zeolite occurs alternating with montmorillonite layers in Nuldaeri, Yongdongri and Haseori tuffs of Jahanggi, Gampo and Haseo Groups respectively. Zeolite was formed by diagenesis. of acidic volcanic tuffs.

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Structure of Upwelling off the Southease Coast of Korea (夏秀 韓國 南東海岸의 湧昇의 構造)

  • Lee, Jae-Chul;Na, Jung-Yul
    • 한국해양학회지
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    • v.20 no.3
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    • pp.6-19
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    • 1985
  • Hydrographic data and daily time series of longshore wind, sea level and sea surface temperature were used in order to explain why the upwelling effect in SST is especially prominent near Ulgi-Gampo although the sea level records along the whole southeast coast show a nearly uniform upwelling-downwelling response to wind. Regional difference in intensity of the wind-induced upwelling represented by the SST decrease is attributed to the combined influence of two factors; one is the baroclinic tilting of isotherms due to the East Korea Warm Current (EKWC) near the Ulgi-Gampo coast, the other is the topographic effects around the southeast coast. Baroclinic tilting effect of EKWC which is generally strongest near the coast of Ulgi to Gampo results in both of the shoaling of cold water and the westward trapping of the coldest bottom water over the shallower shelf rather than the deepest troough region off that coast regardless of the season. Therefore, becacse of the cold water ready for upwelling at the subsurface layer, SST responds very rapidly to the upwelling-favorable winds of summer only off the Ulgi-Gampo coast. Spreading isobaths from Pusan to Gempo can reinforce the upwelling of the cold bottom water and its westward trapping.

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The Wind Effect on the Cold Water Formation Near Gampo-Ulgi Coast (감포-울기 연안해역에서 발생하는 냉수대 현상과 해상풍과의 관계)

  • LEE Dong-Kyu;KWON Jae-Il;HAHN Sang-Bok
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.31 no.3
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    • pp.359-371
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    • 1998
  • The cold water event near Gampo-Ulgi coast in summers between 1987 and 1994 are studied using sea surface temperature records at the coastal stations, ocean winds measured by SSM/I and AVHRR SST images. The response time of the cold water events by upwelling is less than two days and surface cold water expands up to the Ulleung Island. An analysis of 61 upwelling favorable winds indicates that the surface water temperature drops more than $1^{\circ}C\;in\;80\%$ of the south-westerly wind events. The linear correlation coefficient between wind impulses and the maximum temperature drops is good (0.6). It is found that the major cause of the cold water events is the along-shore wind in summer. The bottom topography and off-shore direction of the East Korean Warm Current by the potential vorticity conservation near Gampo coast also contribute the formation of the cold water along the southeast coast of Korea.

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Mineral Chemistry and Thermo-chemical Characterization of Wellsite, a Barrian Zeolite, from the Tertiary Formation in Gampo Area (감포 지역의 제3기 층에서 산출되는 Ba-제올라이트인 웰자이트의 광물화학 및 열화학적 특성)

  • 노진환;김기업
    • Journal of the Mineralogical Society of Korea
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    • v.10 no.2
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    • pp.105-113
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    • 1997
  • Mineral description and mineralogical characterization were made for the wellsite, a barrian zeolite, which found as diagenetic alterations in the Miocene pyroclastic rocks in Gampo area. The wellsite occurs together with clinoptilolite, smectite and apatite as euhedral crystallites (0.2~0.4mm) forming interpenetraion twinning in the vesicles of altered pmice fragments. Compared to other reported wellsites, the wellsite is rather silicic (Si/(Al+Fe): 3.12-3.16) and Ca-rich. Unit cell dimensions and chemical formular determined from XRD, EMPA and TGA data are as follows:a=9.883$\AA$, b=14.204$\AA$, c=8.677$\AA$, $\beta$-124.764$^{\circ}$, (Ba0.57K0.36)(Ca1.18Na0.04)Al3.9Si12.1O32.13.9H2O.The cation composition of the Gampo wellsite, which shows an exchange reaction in the form of Ba2++Ca2+=2(K++Na-), is deviated far from the compositional range of a phillipsite-harmotome series. Due to higher abundance of divalent cations (Ca, Ba) and si in the wellsite, cimpared to those of the phillipsite and harmotome reported in other areas, the zeolite seems to be characteristic of higher water content (18.7 wt%) and higher thermal stability. XRD, chemical and thermo-chemical results of the wellsite reflects that wellsite is rather a Ba- and Ca-rich end member of a phillipsite-harmotome-wellsite series than an intermediate phase of phillipsite-harmotome series or a barrian variety of phillipste.

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Numerical Simulation of Upwelling Appearance near the Southeastern Coast of Korea (한국 남동 연안역의 용승현상에 관한 수치실험)

  • Kim, Dong-Sun;Kim, Dae-Hyun
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.14 no.1
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    • pp.1-7
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    • 2008
  • To investigate the appearance of cold water by upwelling effect near Ulsan-Gampo of the southeastern coast in Korea on June, 1999, we carried out a numerical experiment by 3-dimensional diagnostic numerical model. Appearance of cold water by the result of numerical experiment was due to upwelling by wind effect at 50-100m depth near Ulsan-Gampo coast. This result was mused by using a model to 2 times of existing wind magnitude near Busan, Ulsan and Gampo that is 5.0m/sec wind. Therefore, to illustrate the phenomenon of extraordinary marine environment like upwelling event and so forth, appropriate wind data at sea should be used instead of those on land.

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The Geomorphological Development of Marine Terraces UHS (upper higher surface) and HHS (high higher surface) around Yeondae-san, Gampo-Eup, Southeastern Coast of Korea (한국 남동해안 감포 연대산 지역 해안단구 상고위면과 고고위면 지형발달)

  • Hwang, Sangill;Yoon, Soon-Ock
    • Journal of The Geomorphological Association of Korea
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    • v.27 no.4
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    • pp.13-28
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    • 2020
  • In this study, the distribution and topographic development of marine terraces, UHS (Upper Higher Surface) and HHS (High Higher Surface) at Yeondae-san area, Gampo-eup were discussed. We critically examined on the substance of the Yeongdong-myeon (a low-lying erosion surface) in the east coast of Korea. In study area, UHS including UHS-246m, UHS-241m, UHS-235m, UHS-220m, UHS-210m and UHS-220 is found on the highest altitude among the marine terraces in Korea. The existence of UHS requires new interpretation on topographical surface like Yeongdong-myeon, which has been commonly accepted as a theory in the society of Korean Geography. Since UHS is distributed continuously ascending on the altitude of HHS, the period of formation should be understood in the same context. And UHS of paleo-shoreline 246m has been estimated to be formed about 1.5 million years ago.