• Title/Summary/Keyword: 남해안

Search Result 961, Processing Time 0.041 seconds

The Typhoon Surge in the Southern Coast of Korea (한국 남해안의 태풍에 의한 해일)

  • Jang, Seon-Deok;Lee, In-Cheol;Park, Cheol-Seok
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.27 no.4
    • /
    • pp.293-302
    • /
    • 1991

  • The anomalous sea level deviation or storm surge caused by the typhoon Thelma in 1987 are studied analysing tidal observation data at 7 stations in the south coast of Korean peninsula. The surges are calculated by subtracting the predicted tidal height from the observed tidal record. The tidal deviation at these stations along the coast are discussed in association with meteorological data. The sea level anomalies are studied by means of the empirical orthogonal function (EOF) analysis and the fast fourier transform (FFT) method. The results of analysis suggest that the peak value of surges are higher at the tidal stations in semi-enclosed bay and in long narrow channel than at the ones facing with the open sea. From the result of EOF analysis, the temporal and spatial fluctuations of storm surge can be described by the first EOF mode, which explains 63% of the total variances during the passage of typhoon Thelma. The deviation of storm surge in the studied areas indicates bi-modal peak during the passage of typhoon Thelma. From the results of FFT spectrum analysis, the peak of energy of autospectrum for surge, atmospheric pressure, and wind stress appeared at low frequency fluctuations band of 0.008-0.076 cph over the 4 stations. Auto-correlation function of surge showed periodicity, while that of atmospheric pressure and wind stress indicates no periodicity. The result of FFT analysis shows that the typhoon surges are related chiefly with the change of atmospheric pressure in an open bay (Cheju Harbor), but with the wind stress in a semi-enclosed bay (Yeosu Harbor).

  • PDF

Fluctuation Characteristics of Seawater Temperature Identified by Time Series Analysis Off the Southern Coast of Korea (한국 남해안에서 시계열 분석을 통한 수온 변동 특성)

  • Jang, Chan-Il;Kim, Dong-Sun
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.23 no.7
    • /
    • pp.893-901
    • /
    • 2017

  • In order to understand the fluctuation characteristics of water temperature in August, water temperature, tide level, air temperature and wind data were analyzed using a power spectrum and coherence analysis for a region off the southern coast of Korea. Spectrum analysis showed that the water temperature and tide level in Wando, Goheung, Yeosu, Tongyeong and Masan have peaks over a semi-diurnal period. Coherence showed that water temperature was affected by tide in Wando, Goheung, Yeosu and Tongyeong where tidal range is relatively high. In Masan and Busan, where tidal range is relatively low, however, the tide did not affect water temperature significantly. In particular, wind was the most important factor in relation to water temperature in Masan. Time lags were calculated from phase. In Wando, water temperature decreased 1.5 hrs after a flood tide began. Water temperature decreased 0.3 hrs after a flood tide began in Goheung and Tongyeong. In Masan, water temperature increased 3 hrs after a south wind began. Water temperature in Yeosu was affected by tide, but air temperature, tide and wind in Busan affected water temperature very little.

  • https://doi.org/10.7837/kosomes.2017.23.7.893 인용 PDF KSCI

무인항공기의 활용과 전망

  • Lee, Jae-Eon
    • Aerospace Industry
    • /
    • v.31
    • /
    • pp.22-29
    • /
    • 1995

  • 최근 삼풍백화점 붕괴사고, 남해안 유조선 좌초사건 등 대형사고가 잇따라 발생했다. 초기단계에서 적절한 조치를 취했으며 피해를 줄일 수 있었을 것이라는 지적이 많았다. 만일 치명적인 방사능 유출사고가 일어난다면 어떻게 대처해야 할까? 여기서는 무인기의 다양한 응용방안을 실제 국내에서 일어났었던 사건들로 부터 접근해 보고, 무인항공기 개발 현황과 시장전망을 알아보고자 한다.

  • PDF