• Title/Summary/Keyword: coastal current

Search Result 1,065, Processing Time 0.028 seconds

Study On The Coastal Cold Water Near Ulsan

  • Lee, Ki-Baik
    • 한국해양학회지
    • /
    • v.13 no.2
    • /
    • pp.5-10
    • /
    • 1978
  • The coastal cold water near Ulsan, Korea, almost always appears in summer. From the results of some data analysis, it is found that this cold water has an important relation to the anticlockwise circulation appearing near the coast where the anticlockwise circulation turns its current direction from south to east.

  • PDF

A Time-Dependent Wave-Current Interacted Wave Deformation Model Based on Extended Mild Slope Equation (흐름효과를 고려한 확장형 시간의존 파랑변형모형)

  • 이동수;편종근
    • Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
    • /
    • 2003.08a
    • /
    • pp.44-52
    • /
    • 2003
  • 항만 및 해안의 이용과 개발 그리고 연안해역공간에서 발생하는 각종 재해를 예방하는 측면에서 볼 때 해안에서 형성되는 여러 물리적인 현상들을 정확하게 이해하고 해석하여 필요에 따라 적절히 활용할 수 있는 것이 무엇보다도 중요한 과제이다. (중략)

  • PDF

Behavior of Currents and Suspended Sediments around a Silt Screen

  • Jin, Jae-Youll;Chae, Jang-Won;Song, Won-Oh;Park, Jin-Soon;Kim, Sung-Eun;Jeong, Weon-Mu;Yum, Ki-Dai;Oh, Jae-Kyung
    • Ocean and Polar Research
    • /
    • v.25 no.spc3
    • /
    • pp.399-408
    • /
    • 2003
  • The behavior of Suspended Sediment Concentrations (SSC) around a silt screen in a microtidal coastal area was hydrodynamically measured. The current speed at the mid-layer about 30m downstream of the screen reduces to about half that at the same distance upstream. It was caused by the contraction of the vertical section due to the screen. Even during a relatively weak storm period the SSC increases to that of the value caused by dredging. Section-averaged SSC at the downstream of the screen is higher by about 60% than that at the upstream, suggesting that the silt screen plays an adverse effect rather than a constructive role in the reduction of SSC generated by dredging.

New Approach for Surf Zone Dynamics (쇄파대 동력학에 대한 새로운 접근)

  • Lee, Jung-Lyul;Hsiang Wang
    • Journal of Korean Society of Coastal and Ocean Engineers
    • /
    • v.5 no.4
    • /
    • pp.384-394
    • /
    • 1993
  • A simple surf zone model is presented The present model takes a quite different approach by showing that wave action is conserved in the surf zone. This condition together with the conservation of energy enables us to develop a surf zone model that requires fewer empirical coefficients. The model is capable of predicting surf zone properties and is presented in analytical forms for the two-dimensional gradually-sloped bottoms. The analytical results were compared favorably with available laboratory data. This surf zone model provides the surface current pattern of the vertical circulation model. and consequently, significantly contributes to solving the three-dimensional current pattern.

  • PDF

Inhabit Features of a Brown Alga Undaria peterseniana in Coastal Area of Ulleung Island (울릉도 연안산 해조류 넓미역 Undaria peterseniana의 서식 특성)

  • YOON, SUNG JIN
    • Journal of Fisheries and Marine Sciences Education
    • /
    • v.27 no.3
    • /
    • pp.747-756
    • /
    • 2015
  • Brown alga Undaria peterseniana has been interested in the commercial scale aquaculture for warm water species development in southern coastal area of Korea. However, this species was classified an endangered species caused by a decrease in habitat and natural population. In this study, inhabit characteristics of U. peterseniana was investigated in their natural habitat of Ulleung Island, Korea. The U. peterseniana population was occurred dense patches at 20~30m depth. Total length of the alga reached 1.0~2.0m and the largest width ranged 10.0~35.0cm during the study. In 2013, habitats of this species increased two sites compared with the previous year and their distribution extended to low depth (10m) of coastal area. In long-term data, seawater temperature revealed a continuous increment by strong going north of East Korea Warm Current or Ulleung Warm Eddy turning around the coast of Ulleung Island. It suggested that habitat extension of U. peterseniana may be caused by suitable settlement condition and increase of warm water around the coastal area. Current studies of this species may be continuously required in the possibility of fisheries resources as aquaculture species and index species of increment of water temperature at the fixed monitoring site in East Sea. This is the first study to research ecological feature U. peterseniana population at the natural habitat of Ulleung Island.