海洋理工学会誌
Online ISSN : 2188-3262
Print ISSN : 1341-2752
ISSN-L : 1341-2752
最新号
選択された号の論文の4件中1~4を表示しています
原著
  • 鈴木 直弥, 道岡 武信, 根田 昌典, 轡田 邦夫, 増田 優治
    2019 年 25 巻 1 号 p. 1-14
    発行日: 2019年
    公開日: 2019/08/07
    ジャーナル フリー

    Generally, the air-sea momentum, heat, and CO2 gas flux are calculated in field observation using the eddy correlation method, which simultaneously measures the horizontal and vertical wind components. Measuring the components of wind velocity is usually limited to fixed installations owing to the minor effect of the platform on the wind flow. Occasionally, numerical simulations are sometimes used for shipboard observations. However, the details of the effect of the wind flow around an observation ship are scarcely investigated using numerical simulations, although ships affect the wind flow and wind direction by wind distortion. In this study, we investigated the effect of ships on the wind flow around the Hakuho–Maru of the Japan Agency for Marine-Earth Science and Technology using a numerical simulation. As a result of the flow visualization, measuring the horizontal and vertical components of wind velocity was very difficult because the wind distortion (upward and downward gusts, among others) was very large owing to the effect of the ship. This showed that the effect of the ship was significant for the measurements of air-sea momentum, heat, and CO2 gas flux.

寄稿
技術資料
  • 青木 茂, 市川 雅明, 小野 数也, 深町 康, 大島 慶一郎, 中川 敏彦, 小林 研吾, 小竹 正人, 小澤 知史
    2019 年 25 巻 1 号 p. 29-34
    発行日: 2019年
    公開日: 2019/08/07
    ジャーナル フリー

    Autonomous profiling buoy system was developed for continuous monitoring for the ice-covered oceans. This profiling buoy is tethered to a fixed floating point to collect time series of vertical profiles by controlling its buoyancy. The profiling buoy is equipped with satellite data transmitter together with oceanographic sensors, so that it can send the observed data near real-time basis at the timing of surfacing. Field experiments of this profiling buoy system were conducted at about 400-m deep region in the Okhotsk Sea for a month from July to August 2014 and for six months from November 2014 to May 2015. Designed functions including measurement, data transmission, and ice-avoiding protocol were successful. At the same time, problems such as limited ascent for the high-speed current were revealed for future improvements.

feedback
Top