• Title/Summary/Keyword: Marine Buoy

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Marine Meterological Characteristics by Comparison of High wind-wave alert and Moored Buoy data off the coast of the East Sea between 2006 and 2013 (동해 외해역 해양 기상 특성 및 풍랑특보와 부이 관측 자료 비교 (2006-2013년))

  • Kim, Yun-Bae;Kim, Sang-Mi
    • Journal of Fisheries and Marine Sciences Education
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    • v.26 no.5
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    • pp.1013-1025
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    • 2014
  • Marine meterological characteristics off the coast in the East Sea between 2006 and 2013 were investigated by comparing the high wind-wave alert and moored-measured significant wave high. Monthly and yearly variations of the high wind-wave alert duration off the coast in the central part of the East Sea are correlated with those of the significant wave height measurement with their minima in June and 2008 and maxima in December and 2012. Both the high wind-wave alert duration and significant wave height increase remarkably during 2010-2013 when compared with during 2006-2009. The remarkable increase, occurring dominantly in December, seems to be related with Arctic oscillation variability. However, the comparisons reveal that only about a half of high wind-wave alerts satisfy the criteria for issuing the high wind-wave alert. To issue the high wind-wave alert, the wind speed at the sea should exceed 14 m/s or the significant wave height should be higher than 3 m. The high wind-wave alerts unsatisfying the significant wave height criteria are issued mainly during spring and summer. These results imply that additional surface buoy moorings in the open basin of the East Sea are necessary for more accurate issue of the high wind-wave alert.

Comparison of Weather and Wave Data from Ocean Observation Buoys on the Southwestern Coast of Korea during Typhoon Muifa (태풍 무이파 내습시 서남해안 해양관측부이 기상파랑자료 비교 연구)

  • Yoon, Han-Sam;Kwon, Jun-Hyeok
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.15 no.3
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    • pp.170-176
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    • 2012
  • This paper analyzes the sea state and characteristics during the August 2011 passage of Typhoon Muifa based on data measured at four ocean weather/wave observation stations (buoys) located on the southwestern coast of Korea. When the typhoon arrived in the area approximately 230 km west of Mokpo at 9 PM on August 7, the decrease in air pressure led to increases in sea level of 25.64 cm at the Chilbal-do buoy, 16.43 cm at the Geomun-do buoy, and 9.60 cm at the Geoje-do buoy. The maximum wave height increased at the Geomun-do buoy about seven times faster than at the Chilbal-do buoy. The low water temperature at Chilbaldo during the typhoon passage probably reduced the wave energy. In the face of the oncoming typhoon, the southwest direction of the wind and waves may have been the result of external forces transporting seawater (energy) from the open sea toward the coast. The weather and ocean data from the Mara-do buoy were negatively correlated with those of Chilbal-do, whereas the data from Geomun-do had a positive correlation with those of Geoje-do.

Verification of Communication Distance and Position Error of Electric Buoy for Automatic Identification of Fishing Gear (어구 자동 식별을 위한 전자 부이의 통신 거리 및 위치 오차 검증)

  • Kim, Sung-Yul;Yim, Choon-Sik;Lee, Seong-Real
    • Journal of Advanced Navigation Technology
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    • v.25 no.5
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    • pp.397-402
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    • 2021
  • The real-name electric fishing gear system is one of the important policy capable to build 'abundant fishing ground' and to protect marine environment. And, fishing gear automatic-identification system is one of IoT services that can implement above-mentioned policy by using communication such as low power wide area (LPWA) and multi-sensing techniques. Fishing gear automatic -identification system can gather the location data and lost/hold data from electric buoy floated in sea and can provide them to fishermen and monitoring center in land. We have developed the communication modules and electric buoy consisted of fishing gear automatic-identification system. In this paper, we report the test results of communication distance between electric buoy and wireless node installed in fish boat and location error of electric buoy. It is confirmed that line of sight (LOS) distance between electric buoy and wireless node is obtained to be 62 km, which is two times of the desired value, and location error is obtained to be CEP 1 m, which is smaller than the desired value of CEP 5 m. Therefore, it is expected that service area and accuracy of the developed fishing gear automatic-identification system is more extended.

Sea Surface Cooling in the East Sea with the Passage of Typhoons (태풍통과시 동해에서의 해수면 냉각현상)

  • HONG Chul-Hoon;SOHN Ik-Sung
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.37 no.2
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    • pp.137-147
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    • 2004
  • Sea surface cooling (SSC) with the passage of typhoons is examined in the East Sea using the Japan Meteorological Agency buoy data $(37^{\circ}45'N,\;134^{\circ}23'E)$ during 1983-2000 and a three-dimensional primitive equation model (the Princeton Ocean Model). Forty typhoons in this period induced the SST decrease ranging from about $-0.5^{\circ}C\;to\;-4.3^{\circ}C.$ Intense SSC $(<-2^{\circ}C)$ occurs with typhoons that passed mainly through the left-hand side of the buoy station. The model is implemented to examine a physical process of SSC with a typical-track typhoon in the northwestern Pacific $(24^{\circ}N\;to\;52^{\circ}N).$ The model well reproduces prominent features in the observation and addresses how it happens; SSC is induced mainly by momentum mixing effect stirred with the typhoon rather than upwelling.

Evaluation of Beach Pollution by Aquaculture Styrofoam Buoys in Tongyeong, Korea (양식장 스티로폼 부자쓰레기로 인한 통영 해변의 오염 평가)

  • Hong, Su Yeon;Lee, Chan Won;Hong, Sunwook;Lee, Jongmyoung;Jang, Yong Chang
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.17 no.2
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    • pp.104-115
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    • 2014
  • Abundance and composition of marine debris on 13 beaches of Tongyeong City, South Korea were surveyed in 2013 Autumn. The average quantity of macro debris (>25 mm) was about 30 particle/$m^2$ and that of micro debris (1 mm-25 mm) was about 26,971 particle/$m^2$. This is a very high level compared with other areas of South Korea and the other countries. Among the 7 material types of debris (styrofoam, hard plastic, fiber, metal, glass, wood and others), styrofoam composed a large portion: 75% of macro debris and 98% of micro debris. And among the 'whole' styrofoam debris items whose original volume is remained more than 50%, styrofoam buoy debris composed 93%. This result suggests that the beaches surveyed are seriously contaminated by marine debris, and most of its sources are aquaculture styrofoam buoys. Management of styrofoam buoy debris used for oyster aquaculture in Tongyeong City is important not only for Tongyeong city, but also for other areas, because Tongyeong city hosts the biggest number of oyster aquaculture areas in South Korea.

A Study on Optimal Placement of Underwater Target Position Tracking System considering Marine Environment (해양환경을 고려한 수중기동표적 위치추적체계 최적배치에 관한 연구)

  • Taehyeong Kim;Seongyong Kim;Minsu Han;Kyungjun Song
    • Journal of the Korea Institute of Military Science and Technology
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    • v.26 no.5
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    • pp.400-408
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    • 2023
  • The tracking accuracy of buoy-based LBL(Long Base Line) systems can be significantly influenced by sea environmental conditions. Particularly, the position of buoys that may have drifted due to sea currents. Therefore it is necessary to predict and optimize the drifted-buoy positions in the deploying step. This research introduces a free-drift simulation model using ocean data from the European CMEMS. The simulation model's predictions are validated by comparing them to actual sea buoy drift tracks, showing a substantial match in averaged drift speed and direction. Using this drift model, we optimize the initial buoy layout and compare the tracking performance between the center hexagonal layout and close track layout. Our results verify that the optimized layout achieves lower tracking errors compared to the other two layout.

A Research of Design and Implementation of Visual Program to Displaying External Factors of Marine Buoy using Quest3D (Quest3D 기반 해상부표 동적안정성의 시각적 표현 프로그램 설계 및 구현에 관한 연구)

  • Lee, Seo-Jeong;Lee, Jae-Wook;Gug, Seung-Gi
    • Journal of Navigation and Port Research
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    • v.36 no.8
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    • pp.599-605
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    • 2012
  • As vessels are faster and bigger, higher safety navigation techniques have been required. In marine traffic area, buoy is to be one of the most important equipment, so that it should be built stable and robust. Verification in design level is good to accomplish it. This paper tries to implement visual program to confirm the external stability, which shows the movement on water by external factors such as wind, tide and current. Considering further requirements for additional influences or functions, design architecture for program introduces the concept of software component. Using Quest3D as the graphic tool, visual programming with software component concept can be implemented.

A study on the data transmission performance for the development of the telesounder based on LTE communication system (LTE 통신 시스템 기반의 원격 어군탐지기 개발을 위한 데이터 전송 성능에 관한 연구)

  • HEO, Gyeom;HWANG, Doo-Jin;KANG, Tae-Jong;SHIN, Hyeon-Ok
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.58 no.2
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    • pp.153-158
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    • 2022
  • A telesounder is a device that can monitor the appearance of fish in the sea on land and store fish detection data. This study was conducted to monitor the appearance of fish resources in coastal or near seas by using LTE communication for data transmission of the telesounder. The purpose of this study was to develop a prototype telesounder that can monitor the appearance of fish groups in the waters about 50 km away from the coast and store fish detection data. In this study, the prototype telesounder including a fish finder, communication device and battery for stable operation at sea was developed. The stability of telesounder buoy, data transmission/reception and expected use time were investigated. The expected use time of the telesounder using LTE communication with a lithium battery (12 V, 120 Ah) was about 274 hours under the conditions of 10 minutes off and 10 minutes on, about 520 hours under the conditions of 30 minutes off and 10 minutes on, and about 142 hours under continuous conditions. As a result of the sea test, it was found that the telesounder can be used in the sea area moved about 34 km from the land and the telesounder buoy was evaluated to have secured basic stability (buoyancy balance, waterproof, antenna strength, etc.) for operation in a marine environment.

Estimation of Air-Sea Heat Exchange Using BUOY Data at the Yellow Sea, Korea (부이 관측자료를 이용한 서해 해역의 해양-대기 열교환량 산출)

  • kang, Yune-Jeung;Hwang, Seung-On;Kim, Tae-Hee;Nam, Jae-Cheol
    • Journal of the Korean earth science society
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    • v.22 no.1
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    • pp.40-46
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    • 2001
  • Heat exchange between the atmosphere and sea is produced using the data from two 3m discus buoy installed by KMA in 1996. The meteorological and oceanic characteristics at the Dukjukdo and Chilbaldo buoy for the period 1996 ${\sim}$ 2000 are discussed. Daily averaged sensible heat and latent heat flux at each site are estimated from bulk aerodynamic method using given data and analyzed. Quantitative analyses show SST indicates 1-year cycle like air temperature but has 1 month lag. Sea level pressure is lowest in July, humidity is higher from May to August, and wind speed has averaged value of 5 m/s and higher in autumn and winter. Sensible heat flux analyses present that strong heat loss from the sea occurs in autumn and winter and weak heat loss from atmosphere appears in spring and summer, and net sensible heat loss from the sea is found throughout the year. The ocean significantly releases latent heat into atmosphere from August to May but get a little latent heat from atmosphere in other months. Net latent heat loss from the sea is larger than net sensible heat loss except in January and February. Comparison with two sites suggests that the magnitude of heat flux and their fluctuation are generally stronger at Dukjukdo than at Chilbaldo. In case study, both sensible and latent heat flux is a little more at Chilbaldo in March 1998, but substantially stronger at Dukjukdo in November 1996.

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