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Research and development of the radar system for monitoring the variability of surface current in coastal and strait areas

沿海海峡海流变化监测雷达系统研制

基本信息

批准号：
17340141
负责人：
MASUDA Akira
金额：
$ 9.99万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17340141/
关键词：
HF radar ADCP interpolation estimation tidal current drift current Tsushima Eddy seasonal variation curvilinear coordinates 海面境界層エクマン層方位検出改良手順

项目摘要

1. Developing the current monitoring system based on HF radar and the methods for analyzing the data obtained by that system.Radar measurement often suffers from its limited accuracy and insufficient number of data. Moreover HF radar fails to measure the current sometimes in some part of the observation area. We therefore developed general methods for interpolating and estimating the current field with application to HF radar measurement in mind. 1) The standard analysis used when 2 units of radar are available is generalized to the case of an arbitrary number of radar units in a single area. 2) The harmonic interpolation method was developed, which proved quite simple, robust and useful. 3) The harmonic interpolation method was generalized to the least square method with harmonic interpolation. 4) Hydro-dynamical meaning was given to the harmonic interpolation method. 5) Useful representation was derived for general orthogonal curvilinear coordinates, including the polar coordinate sy … More stem used in HF radar measurement.2. Oceanography on the variability of the surface current in the Tsushima Strait revealed by HF radar.2.1) Our radar system often detected the Tsushima Eddy, east of Tsushima. It is a sub-mesoscale anti-clockwise eddy of the same size as Tsushima. We analyzed the spatial and temporal properties of Tsushima Eddies on the basis of the accumulated data obtained by HF radar. Strong and notable Tsushima Eddies tend to be generated in summer to autumn. They are likely to be born at intervals of 4-6 days or 10-12 days. They seem to be shed at the southeastern tip of Tsushima, drifting northeastward. These results suggested that the generation of Tsushima Eddies is controlled by the intensity of the Tsushima Warm Current, the fortnightly cycle of the spring-neap tide and seasonal variation of the density stratification; the Tsushima Eddies are found in the wake of Tsushima against the northward flowing Tsushima Current with relatively strong alternating tidal current superimposed.2.2) We analyzed the seasonal variation of the surface current in the Tsushima Strait on the basis of the accumulated current maps of the monthly mean current field obtained by the HF radar system. In summer, southwestward flowing counter current appears east of Tsushima. In winter surface current in the eastern channel of Tsushima Strait seems to flow southeastward to Fukuoka, a curious result Substantial current becomes visible, however, if the wind-drift current estimated adequately is eliminated from monthly mean current; .seemingly southeastward surface current in winter is mostly ascribed to the wind-drift component due to monsoon. On the other hand from summer to autumn, frequent generation of Tsushima Eddies, east of Tsushima, was confirmed as was described in 2.1) It is suggested therefore that the southwestward mean counter current east of Tsushima in summer represents the average of definitely anti-clockwise eddies (Tsushima Eddies) activated in the eastern wake of Tsushima in summer. Less

1.发展了基于高频雷达的电流监测系统及数据分析方法。高频雷达有时在观测区域的某些地方测不到海流。因此，我们开发了一般的方法，用于插值和估计当前的领域与应用高频雷达测量铭记。1)当2个雷达单元可用时所使用的标准分析被推广到单个区域中任意数量的雷达单元的情况。2)提出了一种简单、鲁棒、实用的谐波插值方法。3)将调和插值法推广到调和插值最小二乘法。4)给出了谐波插值方法的流体动力学意义。5)导出了一般正交曲线坐标的实用表示式，包括极坐标系 ...更多信息高频雷达测量中使用的杆.高频雷达揭示的对马海峡表层流变化的海洋学研究。2.1）我们的雷达系统经常探测到对马以东的对马涡旋。它是一个与对马大小相同的次中尺度逆时针涡旋。利用高频雷达积累的资料，分析了对马涡旋的时空特征。对马涡在夏、秋两季有产生的趋势。它们可能间隔4-6天或10-12天出生。它们似乎在对马的东南端脱落，向东北方向漂移。结果表明，对马涡的产生受对马暖流强度、大潮周期和密度层结的季节变化的控制;对马涡是对马流与相对较强的交变潮流叠加后，对马流向北流动的尾流。2.2）根据高频雷达月平均流场的累积流图，分析了对马海峡表层流的季节变化。夏季，对马以东出现西南逆流。冬季对马海峡东槽的表面流似乎是向东南流至福冈的，这是一个奇怪的结果。然而，如果从月平均流中剔除充分估计的风漂流，则可以看到实质性的流。冬季表面流似乎是向东南流，主要归因于季风的风漂流分量。另一方面，从夏季到秋季，对马以东的对马涡旋频繁产生，这与2.1）中的描述一致。因此，夏季对马以东的西南平均逆流代表了夏季对马以东尾流中激活的绝对逆时针涡旋（对马涡旋）的平均值。少