Measurements of air-ice drag coefficient over the ice-covered Sea of Okhotsk
Measurements of air-ice drag coefficient over the ice-covered Sea of Okhotsk
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DOI：
10.1007/s10872-009-0042-8
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发表时间：
2009-11
影响因子：
2.3
通讯作者：
Ayumi Fujisaki;H. Yamaguchi;T. Toyota;Akio Futatsudera;M. Miyanaga
中科院分区：
文献类型：
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作者：
Ayumi Fujisaki;H. Yamaguchi;T. Toyota;Akio Futatsudera;M. Miyanaga
用涡旋相关法测量了鄂霍次克海南部中性分层cdn条件下的气冰阻力系数。利用计算流体动力学（CFD）对船舶结构引起的风场扰动进行了评估，并采用两种校正方法估计了cdn的误差范围：一种是基于CFD的结果，另一种是基于Taylor和Yelland（2001）提出的cdnover开阔水域参数化。通过CFD校正，最终得到的cndnx 103值在1.9 ~ 5.4之间，平均值为2.7；另一种方法得到的cndnx 103值在1.5 ~ 5.0之间，平均值为3.1。这比Shirasawa（1981）建议的2.5值要大一些，与Guest和Davidson（1991）对第一年冰的数值一致，粗糙冰的数值为2.2-4.0，非常粗糙冰的数值为3.1-5.0。大多数冰况的特征是直径小于100 m的破碎浮冰和凸起的冰缘，这使得表面比平坦的冰面更粗糙。冰的浓度与冰的浓度之间的关系不明确，主要是由于干舷处冰面条件变化较大，无法检测到形式阻力的贡献。粗糙度长度还使用先前研究中开发的雪覆盖冰模型进行了评估。
The air-ice drag coefficient under neutral stratificationCDNwas measured with the eddy correlation method in the southern Sea of Okhotsk. The disturbance of the wind field caused by the ship’s structure was evaluated by computational fluid dynamics (CFD), and two types of correction methods were applied to estimate the error span ofCDN: one is based on the results of CFD, and the other is based on the parameterization ofCDNover open water suggested by Taylor and Yelland (2001). TheCDN× 103values finally obtained ranged from 1.9 to 5.4 with a mean value of 2.7 by the CFD correction and from 1.5 to 5.0 with a mean value of 3.1 by the other method. This is somewhat larger than the value of 2.5 suggested by Shirasawa (1981), and in the same range as 2.2–4.0 over rough ice and 3.1–5.0 over very rough ice, values which were complied by Guest and Davidson (1991) for first year ice. Most of the ice conditions were characterized by broken floes with a diameter less than 100 m and raised rims, which made the surface rougher than flat, level ice. The relation betweenCDNand ice concentration was not clear, mainly because the contribution of the form drag caused at the freeboard was undetectable due to the great variation of ice surface condition. The roughness lengthzMwas also evaluated using the model developed for snow covered ice in a previous study.