基于夏季船载ADCP数据的台湾海峡西南部平均流与潮流特征的初步研究

doi:10.11978/2015100

热带海洋学报 ›› 2016, Vol. 35 ›› Issue (3): 11-19.doi: 10.11978/2015100CSTR: 32234.14.2015100

所属专题：海洋大数据及应用；台湾海峡专题

基于夏季船载ADCP数据的台湾海峡西南部平均流与潮流特征的初步研究

沈俊强, 孙豪为, 潘爱军, 邱云

国家海洋局第三海洋研究所, 福建厦门 361005

收稿日期:2015-07-28 出版日期:2016-05-29 发布日期:2016-05-27
作者简介:沈俊强(1986—), 男, 福建省漳州市人, 硕士研究生, 主要从事热带边沿海海洋环境动力学研究。E-mail: jqshen@tio.org.cn
基金资助:
国家海洋局第三海洋研究所基本科研业务费资助项目(海三科 2013008); 中科院战略性先导科技专项(XDA1102030104)

Study on characteristics of mean flow and tidal currents in the southwestern Taiwan Strait based on shipboard ADCP observations in summertime

SHEN Junqiang, SUN Haowei, PAN Aijun, Qiu Yun

The Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

Received:2015-07-28 Online:2016-05-29 Published:2016-05-27
Contact: SHEN Junqiang. E-mail：jqshen@tio.org.cn
Supported by:
Scientific Research Foundation of Third Institute of Oceanography, SOA (2013008); Chinese Academy of Sciences Strategic Leading Science and Technology Projects (XDA1102030104); National Natural Science Foundation of China (41506014, 41176031); Global Change and Ocean-atmosphere Interaction (GASI-03-01-01-03); National Basic Research Program of China (2011CB403502)

摘要/Abstract

摘要：

文章采用国内外普遍适用于船载声学多普勒流速剖面仪(shipboard acoustic doppler current profilers, SADCP)数据滤潮处理的时空拟合最小二乘法(简称最小二乘法), 对台湾海峡南部浅滩2004—2013年夏季(6—9月)所获取的SADCP数据进行正压潮、流分离。结果表明: 最小二乘法获得的平均流和基于原始数据格点化后矢量平均取得的平均流流向均趋于东北向, 并且具有大致相同的强、弱流区空间分布形态, 但最大流速稍有差异, 分别为0.48m•s^-1和0.36m•s^-1; 此外, 强流区(流速~0.3m•s^-1)流幅狭窄, 流轴分别约束在东山至龙海外海30m等深线附近和台湾浅滩南部地形骤变区域; 而弱流区(流速<0.1cm•s^-1)集中分布于台湾浅滩中部。进一步研究表明, 2种平均流所估算的海流通量的计算结果比较接近, 可达到(0.74±0.25)×10⁶m³·s^-1。SADCP数据分离所得M₂分潮流显示: 台湾浅滩至东山一线为强潮区, 最大可能流速出现在台湾浅滩(约0.67m•s^-1); 等潮时线分布符合前进波特征, 在潮波传导方向上由西南向东北依次推迟(约2h); 东山近海存在一条呈NW—SE走向的椭圆率正负分界线, 分界线以南潮流椭圆顺时针旋转, 以北则逆时针旋转。

关键词: 船载声学多普勒流速剖面仪, 最小二乘法, 平均流, M2分潮流, 台湾海峡

Abstract:

In this study, we conducted barotropic detiding of the summertime shipboard ADCP (SADCP) dataset in the southern Taiwan Strait (TWS) from June to September during 2004-2013, employing the widely used spatiotemporal fitting by the least squares method (STF-LSM). The results show that the mean flow derived from STF-LSM and that derived from averaged vectors by dataset gridding both flowed northeastward. Moreover, these two mean flows had similar spatial distribution patterns of strong and weak flows, but their maximum velocities were slightly different: 0.46 and 0.34 m·s^-1for the former and the latter, respectively. Besides, the strong currents (about 0.3 m·s^-1) were characterized by the narrow mainstream confined around the depth of 30 m off the sea at Dongshan and Longhai as well as the Taiwan Bank (TWB) with drastic topographic change, whereas the weak currents (less than 0.1 m·s^-1) were mainly distributed in the central TWB. Estimation of the volume transport based on the above mentioned mean flows revealed similar results, up to (0.71±0.24) ×10⁶ m³·s^-1. The strong M₂ tidal currents derived from SADCP were near the TWB and extended to the offshore of Dongshan, with a maximum M₂ current amplitude as large as ~0.64 m·s^-1, which was located in the TWB. The cotidal chart for M₂ currents demonstrates the characteristics of progressive wave, which was delayed successively from the southwest to the northeast along the direction of the tidal wave as the wave propagated (about 2 h). Besides, there was a boundary line along northwestward to southeastward direction with ellipticity equal to zero at the offshore of Dongshan. The M₂ currents rotated counterclockwise in the southern region of this boundary line and clockwise in the northern region.

Key words: shipboard ADCP, least squares method, mean flow, M2 tidal current, Taiwan Strait

中图分类号:

P731.21

沈俊强, 孙豪为, 潘爱军, 邱云. 基于夏季船载ADCP数据的台湾海峡西南部平均流与潮流特征的初步研究[J]. 热带海洋学报, 2016, 35(3): 11-19.

SHEN Junqiang, SUN Haowei, PAN Aijun, Qiu Yun. Study on characteristics of mean flow and tidal currents in the southwestern Taiwan Strait based on shipboard ADCP observations in summertime[J]. Journal of Tropical Oceanography, 2016, 35(3): 11-19.

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基于夏季船载ADCP数据的台湾海峡西南部平均流与潮流特征的初步研究

Study on characteristics of mean flow and tidal currents in the southwestern Taiwan Strait based on shipboard ADCP observations in summertime

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