• 제목/요약/키워드: INTERTIDAL ZONE

검색결과 317건 처리시간 0.028초

난적잠제 상부 사석의 안정에 관한 실험적 연구 (The Stability Riprap on Scattered Submerged Breakwater due to Physical Model)

  • 박상길;김우생;이재성;김성훈
    • 한국해양공학회지
    • /
    • 제24권1호
    • /
    • pp.106-115
    • /
    • 2010
  • This study described the stability of riprap, which was examined by a two-dimensional physical model of a scattered riprap submarine breakwater. Artificial reef structures made of scattered riprap are used like artificial intertidal zone structures as waterfront seaside structures. To prevent topography change in such an artificial intertidal zone the energy is reduced at the scattered riprap submarine breakwater by intercepting high waves. The breaking waves are converted into flow on the front surface slope of the submarine breakwater, which follows the upper part of the artificial intertidal zone. Because of this phenomenon of resisting water flow, it is very important to calculate the required weight of the riprap to maintain its stability. The results of a physical model can be abstracted as shown below. First, distribute the wave breaking types occurring on the front surface slope of the submarine breakwater and arrange it in relation to the movement of riprap. Second, using the hydraulic phenomenon that occurs at the depth of the scattered riprap submarine breakwater, propose a calculation formula for the velocity distribution showing the influence on the stability of the riprap. Third, propose and compare values, which can be obtained by experiments and calculations for riprap stability on the front surface of the artificial intertidal zone. Fourth, calculate the required weight for riprap stability.

남해의 하계 해조군집 -1. 조간대- (Summer Algal Communities in the Rocky Shore of the South Sea of Korea -1. Intertidal Communities-)

  • 강래선;제종길;홍재상
    • 한국수산과학회지
    • /
    • 제26권1호
    • /
    • pp.49-62
    • /
    • 1993
  • 본 조사는 남해의 10개 도서의 조간대 해조군집의 구조와 특성을 조사하였다. 그 결과 군집의 구조는 상, 중, 하부의 뚜렷한 층위구조로 구성되고, 상부와 중부의 중요종은 조사지간에 매우 유사하였다. 하부의 중요종은 지역간에 차이가 있고, 다양한 종에 의해 대표되었다. 상부의 대표종은 막상 또는 사상형의 Gloiopeltis spp., Gelidium divaricatum, Porphyra suborbiculata, Nemalion vermiculare였으며, 분포범위는 해조분포 상한에서 따개비와 홍합류 층의 하한이었다. 중부의 대표종은 Corallina pilulifera, Chondria crassicaulis, Hizikia fusiformis이며, 분포범위는 평균해면 부근이었다. 하부의 범위는 중부의 하한에서 기준면까지이고, Sargassum sagamianum, Laurencia spp., Symphyocladia latiuscula, Chondrus spp., Pachymeniopsis lanceolata, Gigartina spp.가 조사지간에 공통성이 높은 중요종으로 나타났다.

  • PDF

시화호 조력발전소 가동 전·후 조간대 복원과 수조류와의 관계 (The Intertidal Restoration and Relationship with Water birds According to Before and After Operation of Sihwa Lake Tidal Power Plant)

  • 박치영;김호준;백인환;진선덕;백운기;이준우
    • 한국환경생태학회지
    • /
    • 제30권3호
    • /
    • pp.320-327
    • /
    • 2016
  • 2012년 시화호 조력발전소가 가동됨에 따라 조간대가 복원되었다. 복원 후 물새 분류군별 개체수 변동의 차이를 알아보고자 2009년부터 2014년까지 조사가 수행되었다. 복원 전 배수갑문 운영시 조간대 면적은 $5.3km^2$에서 복원 후 $20.3km^2$로 늘어났다. 전체 조류개체수 군집에는 큰 차이가 없었으나 6개 분류군별 개체수 차이를 분석한 결과 잠수성 오리류(p=0.237)를 제외한 백로류(p<0.001), 고니기러기류(p<0.01), 수면성오리류(p<0.001), 도요물떼새류(p<0.001) 갈매기류(p<0.001)에서 유의한 차이를 나타냈다. 시화호 조간대는 복원된 지 얼마 지나지 않았지만 환경 및 저서생태계의 개선이 이루어지고 있으며, 조간대 지역을 기반으로 살아가는 수조류의 서식지 이용에 긍정적 영향을 미친 것으로 판단된다. 본 연구는 사라졌던 조간대가 다시 복원된 유례가 없는 사례이며 향후에는 유사한 환경에서의 생물다양성 유지를 위한 대안의 한 방법으로도 고려될 수 있을 것이다.

한려해상국립공원의 해조상 (Algal Flora in Hallyeo-haesang National Park, Southern Coast of Korea)

  • 최창근
    • 한국수산과학회지
    • /
    • 제41권5호
    • /
    • pp.371-380
    • /
    • 2008
  • This study elucidated the floral composition of marine algae and community structure at Hallyeo-haesang National Park, on the southern coast of Korea. In all, 89 species, comprising 10 green, 30 brown and 49 red algae, were identified. The dominant species in terms of importance value were Ulva pertusa, Colpomenia sinuosa, Undaria pinnatifida, Padina arborescens, Hizikia fusiformis, Sargassum sagamianum and Amphiroa dilatata. The vertical distribution of marine vegetation was characterized by Enteromorpha linza - Ulva pertusa - Gelidium divaricatum in the upper intertidal zone, Hizikia fusiformis - Sargassum thunbergii in the middle intertidal zone, and Amphiroa spp. - Hildenbrandtia rubra - Corallina pilulifera in the lower intertidal zone. Functional form group analysis showed that coarsely branched forms comprised 50.3% of the algal community, whereas thick leathery forms, sheet forms and filamentous forms comprised 11.9-13.1%. R/P, C/P and (R+C)/P values were 1.91, 0.74 and 2.64, respectively. A cluster analysis of species occurrence suggested that the number of marine algal species differed greatly among the sampling sites.

동해안 죽변 조간대 저서동물의 계절적 군집 구조 (Community Structure of Macrobenthos at the Intertidal Zone of Jukbyeon in the East Coast of Korea)

  • 홍성익;최용규;정희동;이윤;김상우
    • 해양환경안전학회지
    • /
    • 제23권4호
    • /
    • pp.331-337
    • /
    • 2017
  • 본 연구에서는 울진군 죽변의 암반조간대에서 2년(2015-2016)간 계절별 저서동물의 군집구조와 분포양상을 분석하였다. 죽변암반조간대의 종조성은 5문 41종으로 자포동물 4종, 연체동물 19종, 환형동물 3종, 절지동물 13종, 극피동물 2종이 출현하였으며, 총개체수 $1,642inds./m^2$, 총생체량 $1,959.42gWWt/m^2$ 조사되었다. 조간대 상부는 조무래기따개비(Chthamalus challengeri), 좁쌀무늬총알고둥(Nodilittorina radiata)이 우점하였다. 하부는 지중해담치(Mytilus galloprovincialis), 배무래기(Nipponacmaea schrenckii), 구멍밤고둥(Chlorostoma turbinata)이 우점하였다. 계절별 우점종의 경우, 조간대 상부에는 겨울과 봄에 조무래기따개비, 여름과 가을에 좁쌀무늬총알고둥이 우점하였다. 조간대 하부는 전 계절에 걸쳐서 지중해담치가 우점하였다. 군집분석을 통해 생물군집의 분기별 유사성을 분석한 결과, 이들 지역은 세 개의 그룹으로 구분되었다. 조간대 하부의 2015년 11월, 2015년 8월, 2016년 2-8월의 Group A와 조간대 하부의 2016년 11월, 2015년 5월의 Group B, 2015년-2016년 조간대 상부의 Group C로 구분되었다.

Vertical Distribution and Seasonality of Intertidal Macroalgae on the Coast of Hawon-Pando, Southwestern Korea

  • Kim, Kwang-Young
    • Journal of the korean society of oceanography
    • /
    • 제34권3호
    • /
    • pp.172-178
    • /
    • 1999
  • An overview of the spatial and seasonal patterns of phytobenthic communities is described from the intertidal zone at Hawon-Pando on the southwestern coast of Korea based on quantitative and qualitative estimates of macroalgae. There were considerable variations of macroalgal diversity and cover value with the intertidal levels. Tn general, the number of species decreased with increasing intertidal height. The upper region was dominated by Sargassum thunbergii. S. thunbergii and crustose red algae were dominant in the mid intertidal habitat. In the lower intertidal Corallina pilulifera and crustose red algae were the conspicuous dominants. Macroalgal community structure at Hawon-Pando is discussed in the context of functional-form groups. The Hawon-Pando intertidal is characterized as consisting of a relatively high cover of species assigned to the thick leathery, crustose and jointed calcareous groups, and is distinguished by a paucity of the filamentous group.

  • PDF

Active Exchange of Water and Nutrients between Seawater and Shallow Pore Water in Intertidal Sandflats

  • Hwang, Dong-Woon;Kim, Gue-Buem;Yang, Han-Soeb
    • Ocean Science Journal
    • /
    • 제43권4호
    • /
    • pp.223-232
    • /
    • 2008
  • In order to determine the temporal and spatial variations of nutrient profiles in the shallow pore water columns (upper 30 cm depth) of intertidal sandflats, we measured the salinity and nutrient concentrations in pore water and seawater at various coastal environments along the southern coast of Korea. In the intertidal zone, salinity and nutrient concentrations in pore water showed marked vertical changes with depth, owing to the active exchange between the pore water and overlying seawater, while they are temporally more stable and vertically constant in the sublittoral zone. In some cases, the advective flow of fresh groundwater caused strong vertical gradients of salinity and nutrients in the upper 10 cm depth of surface sediments, indicating the active mixing of the fresher groundwater with overlying seawater. Such upper pore water column profiles clearly signified the temporal fluctuation of lower-salinity and higher-Si seawater intrusion into pore water in an intertidal sandflat near the mouth of an estuary. We also observed a semimonthly fluctuation of pore water nutrients due to spring-neap tide associated recirculation of seawater through the upper sediments. Our study shows that the exchange of water and nutrients between shallow pore water and overlying seawater is most active in the upper 20 cm layer of intertidal sandflats, due to physical forces such as tides, wave set-up, and density-thermal gradient.

백령도 해조군집의 종조성과 생물량 (The Macroalgal Community of Bagryoungdo Island in Korea)

  • 백재민;황미숙;이재완;이욱재;김종인
    • ALGAE
    • /
    • 제22권2호
    • /
    • pp.117-123
    • /
    • 2007
  • The seasonal change of algal flora and intertidal community structures of Bagryoungdo Island was investigated at Dumujin from February to November 2006. The description of subtidal algal community was made in October by Scientific SCUBA-diving. The total of 43 species, including 6 Chlorophytes, 6 Phaeophytes, 29 Rhodophytes and 2 sea grasses were identified in this survey. The occurrence of species according to season, listed as follows, 26 species in winter, 34 in spring, 18 in summer and 18 in autumn. Three species, Laminaria japonica, Neorhodomela aculeata and Ulva pertusa were dominant. The algal zonation of intertidal zone was figured out by Porphyra spp., Gloiopeltis furcata, Caulacanthus okamurae, Gelidium divaricatum - Neorhodomela aculeata, Enteromorpha compressa - Ulva pertusa, Dumontia simplex, Laminaria japonica from upper to lower zone. The zonation of subtidal zone was figured out by Ulva pertusa - Laminaria japonica - Zostera marina (sea grass), crustacean red algal population in autumn. The average of biomass of macroalgae was measured as 119.4 g∙dry wt/m2.

光陽 에서의 現생底棲 有孔蟲에 관한 硏究 (Implications of the Recent Benthec Foraminifera in Gwangyang Bay, Korea)

  • 장순권
    • 한국해양학회지
    • /
    • 제21권1호
    • /
    • pp.1-12
    • /
    • 1986
  • 光陽 潮間帶와 下潮帶(subtidal zone)의 表層 堆積物의 底棲有孔蟲들은 전체 개체수와 生 對 全體비율간의 관계는 뚜렷한 음(-)의 관계에 있다. 연구지역에서 산 출되는 유공충들은 9m 및 21-30m 사이에서 급격한 조성변화가 있다. 群集分析에 의해서 삼각주를 포함한 조간대, 內灣과 얕은 해저 및 水路(주조유로)등 3개의 生物 場(Biotope)이 뚜렷이 구분된다. 각 환경에 따라 생태 및 堆積환경이 다르며, 水路를 따라서는 外海의 영향을 받는다. 生對 全體비율로 유추한 상대적 퇴적율과 관련된 몇가지 문제점이 논의되었다.

  • PDF

Feeding Habits of Caenogobius mororanus Inhabited at Intertidal Zone of the Western Coast of Korea

  • Kim, Jong-Yeon;Yoon, Jong-Man
    • 한국어업기술학회:학술대회논문집
    • /
    • 한국어업기술학회 2001년도 춘계 수산관련학회 공동학술대회발표요지집
    • /
    • pp.315-316
    • /
    • 2001
  • To understand feeding habits of Cheaenogobius mororanus, this study has been conducted by analyzing stomach contents. C. mororanus were monthly collected from the intertidal zone of Dodun-ri, Sochon from May 1997 to April 1998. Fullness of stomach was increased twice a day, in the morning and afternoon. C. mororanus(1.0 ∼5.9 cm in standard length) was a carnivores consuming mainly decapods, amphipods and copepods. (omitted)

  • PDF