| 基于船载ADCP观测的红沿河核电站周边海域潮流–余流的分离计算 |
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| 引用本文： | 唐华亮,肖劲根,魏皓,聂红涛,张广跃,钱思萌.基于船载ADCP观测的红沿河核电站周边海域潮流–余流的分离计算[J].海洋学报,2020,42(1):12-21. |
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| 作者姓名： | 唐华亮 肖劲根 魏皓 聂红涛 张广跃 钱思萌 |
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| 作者单位： | 天津大学 海洋科学与技术学院，天津 300072 |
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| 基金项目： | 国家重点研发计划（2017YFC1404403）；天津市自然科学基金（16JCYBJC23000）。 |
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| 摘 要： | 基于红沿河核电站取水口周边海域3个不同断面的船载ADCP短期重复走航观测资料,采用传统调和分析方法和L曲线方法对该资料进行潮流–余流分离计算,并通过对比潮流特征、分析水团运动和余流流向的关系,以及对分离后的潮流与余流进行回报,验证L曲线方法对观测时间较短、重复次数不多的走航ADCP资料进行潮流分离的合理性与有效性。结果表明:(1)应用L曲线方法分离的潮流特征与以往的观测结果较为一致,该方法可有效分离半日潮流与全日潮流,但本文采用的数据长度小于1个典型全日潮周期长度,故整个全日潮族以及区内流场动力方面的分析结果尚存不合理之处,还需采用观测时间较长、重复次数较多的走航观测资料改进;(2)分离后的余流近岸向南、离岸向北的分布,符合观测海域的温盐要素分布,余流结果具有合理性;(3) L曲线方法的回归值与实测瞬时流速线性拟合的相关程度较高,均方根误差为6 cm/s左右,相对误差百分比约为10%。该方法可拓展并推广到近海其他关键断面走航流速观测的潮流分离中,以获得流速特征与物质输运通量等重要信息。
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| 关 键 词： | 近海潮流-余流分离 L曲线方法 重复走航ADCP观测 |
| 收稿时间： | 2019/3/18 0:00:00 |
| 修稿时间： | 2019/8/30 0:00:00 |
Separation of tidal and residual current based on ship-mounted ADCP data around area of Hongyanhe Nuclear Power Station |
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| Tang Hualiang,Xiao Jin’gen,Wei Hao,Nie Hongtao,Zhang Guangyue,Qian Simeng.Separation of tidal and residual current based on ship-mounted ADCP data around area of Hongyanhe Nuclear Power Station[J].Acta Oceanologica Sinica (in Chinese),2020,42(1):12-21. |
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| Authors: | Tang Hualiang Xiao Jin’gen Wei Hao Nie Hongtao Zhang Guangyue Qian Simeng |
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| Institution: | School of Marine Science and Technology, Tianjin University, Tianjin 300072, China |
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| Abstract: | Based on the repeated short-term shipboard Acoustic Doppler Current Profiler (ADCP) surveys of three sections around the coastal area of Hongyanhe Nuclear Power Station, the L-curve method was used to separate tidal and residual current. The relationship between the movement of water masses and the direction of residual currents was analyzed and the characteristics of tidal currents were compared with literatures. Regression analysis of flow field verified that L-curve method for de-tiding under this situation was reasonable. The results suggested that: (1) The tidal current characteristics separated by L-curve method were in good agreement with the previous observations, and the semi-diurnal and diurnal tidal current components can be separated effectively, but all of data used in this paper were less than typical diurnal period. Therefore, the results of diurnal current and dynamic analysis of the flow field were still unreasonable. We need to use observations with longer time and more repetitions to correct the deficiency. (2) The residual currents flew to southward nearshore and northward offshore, which was consistent with colder saltier water intruding from south in deep water and warm fresh water run from north along the coastline. (3) The regression values derived from the L-curve method were highly correlated with the measured instantaneous velocity. The root mean square error (RMSE) was about 6 cm/s, and the relative error was about 10%. L-curve method can be extended to de-tide at any critical sections to obtain the important information such as coastal circulation variation and material transport fluxes to estimate the water exchange and resident time. |
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| Keywords: | coastal de-tiding L-curve method repeated shipboard ADCP observation |
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