• Title, Summary, Keyword: Heuksando

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Seasonal Variation in Biomass and Community Structure of Intertidal Seaweeds at Heuksando and Hongdo, Southwestern Coast of Korea (한국 남서해안 흑산도와 홍도의 조간대 해조류 생물량과 군집구조의 계절적 변동)

  • Oh, Ji Chul;Park, Seo Kyoung;Choi, Han Gil;Nam, Ki Wan
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.46 no.6
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    • pp.878-885
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    • 2013
  • Seasonal variation in marine macroalgal community structure was examined at the intertidal zones of Heuksando and Hongdo, Shinan, Korea, from July 2008 to May 2009. In total, 86 macroalgal species were identified, including 12 green, 19 brown, and 55 red algae; 67 species at Heuksando and 70 species at Hongdo, were observed. Annual seaweed biomass was 252.44 g dry $wt/m^2$ at Heuksando and 217.67 g dry $wt/m^2$ at Hongdo. The dominant seaweed in importance value (IV > 15) differed between the sites: Sargassum thunbergii at Heuksando and Corallina pilulifera at Hongdo. The vertical distribution pattern of seaweeds from the upper to lower intertidal zones at Heuksando was Gloiopeltis spp., Ulva spp. - S. thunbergii, S. fusiforme, Hildenbrandia rubra - S. thunbergii, C. pilulifera. On the rocky shore of Hongdo, seaweed zonation was distinct: Porphyra yezoensis, Gloiopeltis spp., Ulva spp. - C. pilulifera, S. fusiforme, Myelophycus simplex - Chondrus ocellatus, C. pilulifera, and Carpopeltis affinis. Annual seaweed coverage, richness index (R), evenness index (J'), and diversity index (H') values were greater at Hongdo (41.35%, 12.82, 0.59, and 2.50 respectively) than at Heuksando (31.54%, 11.93, 0.44, and 1.87 respectively), which may indicate that the seaweed community at Hongdo is more stable relative to the one at Heuksando.

A Study on the Influence of Aerological Observation Data Assimilation at Honam Area on Numerical Weather Prediction (호남지방 고층관측자료동화가 수치기상예보에 미치는 영향에 관한 연구)

  • Ryu Chan-Su;Won Hyo-Sung;Lee Soon-Hwan
    • Journal of the Korean earth science society
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    • v.26 no.1
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    • pp.66-77
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    • 2005
  • Aerological observation at Heuksando located in south-western part of Koran Peninsula has been started at 1 June 2003. In order to clarify the improvement of meteorological prediction quality. it is necessary to compare between aerological data observed at Gawngju and Heuksando and to make clear the influence of Heuksando data assimilation. Therefore numerical simulations were carried out with High resolution meterological prediction system based on MM5(The 5th Generation Mesoscale Model). The pattern of wind and temperature field observed at Heuksando and Gwangju are different due to land surface friction End Sensible heat flux at surface and the wind field Simulated With Gwangju and Heuksando aerological data agree well with observation wind field. Although the amount of precipitation in these experiments is underestimated. the area and starting time of precipitation around Honam province in case with Heuksando data is more reliable that without the data.

A Quantitative Study on Air Transportation Demand Forecasting in Heuksando (흑산도의 항공수요예측에 관한 정량적 연구)

  • Song, B.H.;Song, Y.K.;Choi, Y.C.
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.9 no.2
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    • pp.101-111
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    • 2001
  • Heuksando is an island which belongs to Shinangun, Jeonllanamdo and is located on the southwest sea of the Korean peninsula. Around this island, there are many beautiful islands which embroider the archipelago such as Hongdo, Soheuksando, Haeuido, Gageodo. However in the transportation mode we could not offer convenience to all the visitors coming to this area because access to this place can be made only by ship from Mokpo harbor. So new airport is desirable to solve this problem in this area. Therefore, this study is forecasting air transportation demand between Heuksando and several domestic places in order to give the fundamental materials not only to address the appropriateness to construct a new airport but also to determine it's size and necessary facilities.

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Study on Exploration Method of Seabed Around Heuksando Using Hover Drones (수면호버링 드론을 이용한 흑산도 해저지형 탐사 기법 연구)

  • Kim, Hyeong-Gyun;Lee, Young-suk
    • Journal of Korea Multimedia Society
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    • v.23 no.1
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    • pp.102-110
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    • 2020
  • This study covers exploration of seabed around Heuksando Island using hover drones. To do so, we inspected the terrain of the island and set autonomous flight waypoints on each area of the island's shores. Next, we designated seabed scan radius for drones. Then the drones fitted with laser sensor hover autonomously on their assigned area and acquire seabed data. Finally, we match the seabed data on all areas according to GPS. Our final goal is to make immersive VR maritime cultural map based on 『Jasan Urbo』.

An Economic Analysis of Black Rockfish, Sebastes schlegeli in the Marine Floating Cage Culture (조피볼락 해상가두리 양식업의 지역별·규모별 경제성 분석)

  • Son, Maeng-Hyun;Park, Min-Woo;Lim, Han-Kyu
    • The Journal of Fisheries Business Administration
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    • v.45 no.1
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    • pp.95-107
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    • 2014
  • This study is aimed to analyze the economic performance of black rockfish aquaculture by standardizing cost structures by region and farming size. The result of survey on farming and sale condition in each region, stocking density, survival rate, juvenile price, and unit production was the highest at Yeosu and Tongyeong, Heuksando showed the lowest. While rearing period was the longest at Tongyeong, the shortest region was Yeosu and Wando. In farming cost structure by region, amount of feeing was the highest at Tongyeong and Yeosu, and the lowest was Heuksando. Cost of medicine was high in Wando and Taean region, Yeosu and Hecksando was low. In case of farm size, feed cost ratio was high in the order of medium(0.75ha), small(0.25ha) and large(1.25ha) size. Standard production cost at every farm size of Heuksando showed the lowest among these regions. Taean and Yeosu was middle, and Tongyeong and Wando was the highest. According to the income, profit rate and investment return of farm size in all regions, as the bigger farm size, the higher income and profit rate was revealed. However, in case of Wando, Taean, and Heuksando which regions has high investment return, medium farm size was higher than large size. The result of economic analysis according to various factors, economic feasibility of black rockfish aquaculture in marine floating cage was showed significant changes by rearing and market condition.

Classification of Forest Vegetation for Forest Genetic Resource Reserve Area in Heuksando sland (흑산도 산림유전자원보호구역의 산림식생 유형)

  • Lee, Jeong-Eun;Shin, Jae-Kwon;Kim, Dong-Kap;Yun, Chung-Weon
    • Korean Journal of Environment and Ecology
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    • v.32 no.3
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    • pp.289-302
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    • 2018
  • The study investigated the forest vegetation in 59 plots between June 2017 and August 2017 to understand the forest vegetation structure of the protected zone for forest genetic resource conservation (forest genetic resource reserve area) in Heuksando Island. We classified the vegetation using the Z-M phytosociological method analyzed the importance value and species diversity of each vegetation classification. The analysis showed the Camellia japonica community group at a top level of forest vegetation hierarchy. In the level of community, it was classified into Dendropanax morbiferus community (Vegetation unit 1; VU 1), Carpinus turczaninowii community, and C. japonica typical community (VU 6). C. turczaninowii community was subdivided into Buxus koreana group (VU 2), Rhododendron mucronulatum group (VU 3), Vitis amurensis group (VU 4) and C. turczaninowii typical group (VU 5). Therefore, it was classified into a total of six vegetation units (one community group, three communities, and four groups). The analysis of the mean codominant value of each VU show that Quercus acuta was the highest in VU 1, C. turczaninowii in VU 2, Pinus thunbergii in VU 3, Pinus densiflora in VU 4, and Castanopsis sieboldii in VU 5 and VU 6. The analysis of species diversity showed that VU 2 was the highest among six units in species richness index, species diversity index, and species evenness index. VU 6 showed the highest among six units in species dominance index. In conclusion, a synecology approach to manage six units and twelve species groups was needed for the forest vegetation of Heuksando Island protected area for forest genetic resource conservation.

A Study on the Optimum Design of Photovoltaic Systems for Ligthouses (유인등대용(有人登臺用) 태양광발전(太陽光發電) 시스템 최적설계(最適設計)에 관한 연구(硏究))

  • Jung, Myung-Woong;Lee, Man-Gun;Song, Jin-Soo
    • Solar Energy
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    • v.7 no.2
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    • pp.14-21
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    • 1987
  • For the purpose of a the application of photovoltaics, we have studied about photovoltaic systems for maned lighthouses. The current status of manned lighthouses in Korea are reviewed and detailed descriptions of the 6.48 Kwp photovoltaic system on Heuksando island are described in this paper. And we have discussed about expected effects and problems of this system.

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The first record of Catenula confusa Nuttycombe, 1956 (Platyhelminthes: Catenulida: Catenulidae) from Korea

  • Jung, Jongwoo
    • Journal of Species Research
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    • v.5 no.3
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    • pp.539-540
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    • 2016
  • Microturbellarians, small free-living Platyhelminthes are rich in freshwater environments. They are useful as indicator of water quality. There has never been a record of microturbellarians in Korea. Here I report a microturbellarian species, Catenula confusa Nuttycombe, 1956. Although specimens in this study show some differences with those of the original description of C. confusa in length and width of zooid, they conform to the specific diagnosis of this species.

Determination of Equilibrium Moisture Content of Outdoor Woods by Using Hailwood-Horrobin Equation in Korea (Hailwood-Horrobin 방정식을 이용한 한국의 야외 목재평형함수율 결정)

  • Ra, Jong-Bum
    • Journal of the Korean Wood Science and Technology
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    • v.42 no.6
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    • pp.653-658
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    • 2014
  • This research was carried out to investigate equilibrium moisture content (EMC) of wood in outdoor locations in Korea. EMC was calculated using Hailwood-Horrobin equation for 73 different locations in Korea using the 1981 to 2010 climate normal data obtained from the Korea Meteorological Admnistration (KMA). Daegu showed the lowest values of EMC (11.5), and the highest EMC values (15.8) was found in Heuksando. Considering the season effect, summer (June, July, August) showed the highest values 15.3, followed by autumn (September, October, November) 13.7, winter (December, January, February) 12.2, and spring (February, March, April) 12.0. Monthly EMC showed the lowest values 11.6 in April and July showed the highest EMC values 16.1. The smallest changes in monthly EMC were found in Jeju island and Heuksando showed the largest values 8.7. A proper wood drying based on average EMC is more required in the regions with larger variation in EMC.

Monitoring of Diseases Including Nematode Clavinema mariae Infections in the Cultured Korean Rockfish Sebastes schlegeli During 2013-2016 (2013-2016년 양식 조피볼락(Sebastes schlegeli)의 해역별 선충(Clavinema mariae) 및 병원체 감염 현황)

  • Han, Hyun-Ja;Song, Jun-Young;Cho, Mi-Young;Choi, Hye-Sung;Jung, Sung-Hee;Seo, Han-Gill
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.53 no.3
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    • pp.432-442
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    • 2020
  • Diagnostic monitoring in Korean rockfish cages was performed to survey the prevalence of pathogens in cultured Korean rockfish Sebastes schlegeli from May 2013 to July 2016. A total of 1,945 fish samples collected from the western (Cheonsu Bay and Heuksando), southern (Tongyeong and Namhae), and eastern coasts (Pohang) of Korea were tested for parasites, viruses, and bacteria. In this study, 1,264 and 334 fishes were infected with Microcotyle sebastis and Clavinema mariae, respectively. The prevalence rates of C. clavinema in fishes from Cheonsu Bay, Heuksando, and Tongyeong were 35.3%, 3.9% and 1.9%, respectively. No C. clavinema infection was detected in cultured rockfish from Namhae and Pohang. Furthermore, bacteria including Photobacterium damselae (8.9%), Photobacterium piscicola (2.3%), Photobacterium spp. (8.9%), Aeromonas salmonicida (1.8%), Aeromonas spp. (0.9%), Vibrio scophthalmi (1.5%), Vibrio spp. (3.3%), Streptococcus iniae (1.2%), and others (8.0%) were detected in 373 of 1,364 fishes. No virus was detected in any fish investigated in this study.