• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Cold regions science and technology >Ice ridge keel geometry and shape derived from one year of upward looking sonar data in the Fram Strait
【24h】

Ice ridge keel geometry and shape derived from one year of upward looking sonar data in the Fram Strait

机译：冰脊龙骨的几何形状和形状是根据Fram海峡中向上看一年的声纳数据得出的

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ice ridge keel geometry was studied by analyzing one year of upward looking sonar data collected in the Transpolar drift stream at 79°N, 6.5°W in 2008/2009. Ridges were identified using the Rayleigh criterion with a threshold value of 2.5 m and a minimum draft of 5 m. The keel shape was studied after the identification of ridges from temporal data. On average ridge keels were symmetric both with respect to the centroid of the keel and the keel crest location. By quantifying the ratio between observed keel area and the keel area of an assumed triangular keel shape (often assumed for first year ridges) we observed that in 79% of the cases the ridge cross sectional area would be underestimated by a triangular keel shape. Because keel loads on ships and structures increase with keel draft and keel area it is important that an assumed keel shape maintains the observed keel area. Thus we suggest that a better generalization of the shape of first year ridges is a trapezoidal keel shape rather than triangular. Based on the observations the mean trapezoidal keel, representing both first year ridges and old ridges, has a keel bottom-width which on average is 17% of the keel width. For the deepest keels (＞ 15 m) the mean keel bottom width was 12% of the keel width. The mean keel draft was 7.3 m and the deepest ridge was 25 m. The temporal data was converted to spatial data based on an ice drift speed estimate which assumed free drift. From the spatial data we found that the mean keel width was 28 m and the mean keel cross sectional area was 164 m~2.
机译：通过分析在2008/2009年在79°N，6.5°W的跨极漂移流中收集的一年向上看的声纳数据，研究了冰脊龙骨的几何形状。使用瑞利准则确定山脊，其阈值为2.5 m，最小吃水深度为5 m。从时间数据中识别出脊后，研究龙骨形状。平均而言，脊龙骨相对于龙骨的质心和龙骨c位置对称。通过量化观察到的龙骨面积与假定的三角形龙骨形状（通常假定为第一年的山脊）之间的比率，我们观察到在79％的情况下，三角形的龙骨形状会低估脊的横截面积。由于船和结构上的龙骨载荷随龙骨吃水深度和龙骨面积的增加而增加，因此重要的是，假定的龙骨形状应保持观测到的龙骨面积。因此，我们建议更好地概括第一年山脊的形状是梯形龙骨而不是三角形。根据观察，梯形龙骨（代表第一年的山脊和旧的山脊）的龙骨底部宽度平均为龙骨宽度的17％。对于最深的龙骨（> 15 m），平均龙骨底部宽度为龙骨宽度的12％。平均龙骨吃水为7.3 m，最深的脊为25 m。基于冰漂移速度估计（假定自由漂移），将时间数据转换为空间数据。从空间数据可知，平均龙骨宽度为28 m，平均龙骨截面积为164 m〜2。

著录项

  • 来源
    《Cold regions science and technology》 |2015年第1期|78-86|共9页
  • 作者

    Ole-Christian Ekeberg; Knut Hoyland; Edmond Hansen;

  • 作者单位

    Norwegian University of Science and Technology (NTNU), Department of Civil and Transport Engineering, Hoyskoleringen 7a, N-7491 Trondheim, Norway,DNV GL, N-1363 Hovik, Norway,Veritasveien 1, N-1363 Hovik, Norway;

    Norwegian University of Science and Technology (NTNU), Department of Civil and Transport Engineering, Hoyskoleringen 7a, N-7491 Trondheim, Norway,Sustainable Arctic Marine and Coastal Technology (SAMCoT), Centre for Research-based Innovation (CRI), Norwegian University of Science and Technology, Trondheim, Norway;

    Norwegian Polar Institute, N-9296 Tromso, Norway,Multiconsult, N-9296 Tromso, Norway;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ice ridge keel geometry; Symmetry; Upward looking sonar; Fram Strait; Keel shape;

    机译：冰脊龙骨的几何形状;对称;声纳向上;弗拉姆海峡;龙骨形状;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号