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基于走航ADCP资料的厦门内湾东西口门海域潮流与潮致余流特征分析 总被引：1，自引：0，他引：1
应用厦门内湾东西3个口门断面（五通—下店、嵩屿—鼓浪屿、鼓浪屿—轮渡）一个潮周日走航ADCP资料的空间插值潮、流调和分离结果,分析占主导的M2分潮流与余流沿断面的空间分布特征.分析结果表明受地形约束的3个断面M2分潮流均以往复流为主,断面深槽为主流通道,M2分潮最大可能流速均沿主流深槽向左右岸递减,三断面中以鼓浪屿—轮渡断面最为强劲,平均值为46 cm/s,五通—下店断面次之为43 cm/s,嵩屿—鼓浪屿断面最弱,仅为33 cm/s.该半日潮波进入厦门内湾首先在鼓浪屿—轮渡断面达到最大值,出现时间在月中天后2.1 h,其次为五通—下店断面2.7 h,最后为嵩屿—鼓浪屿断面3.3 h.再者地形变化剧烈的嵩屿—鼓浪屿断面M2分潮非线性运动较强,浅水分潮的幅度增大.潮波的非线性效应又衍生了非周期性的潮致余流,该余流在厦门内湾东西口门有较为稳定的存在,且表现为近岸区流幅大,潮流通道内小,嵩屿—鼓浪屿与鼓浪屿—轮渡断面均值为9 cm/s,五通—下店断面均值为5 cm/s,同时各个断面余流均存在使内湾海水正常更替,沿断面法向一分为二,一进一出的态势.基于本次观测结果计算出一潮周日厦门内湾东西口门余流通量为76.156×10^6m3,净潮通量为69.591×10^6m3,相对偏差小于8.6%. 相似文献
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台湾海峡西部冬季余流的时空变化 总被引：1，自引：0，他引：1
A new data set of observations by six cruises of ship-mounted acoustic doppler current profiler(SADCP) and three 40 d long bottom-mounted ADCPs(BADCPs) is employed to reveal the spatiotemporal variability of tidal and subtidal currents in the western Taiwan Strait(TWS) during winter season. The results confirm the existence of intense cotidal lines for M_2 tidal current, which is located north of 25°N. In this case, no existence of an amphidromic point can be identified. It is also revealed that the counter-wind current(CWC) can extend through the whole western TWS and even occupy the entire water column during winter monsoon relaxation. However,this CWC is observed to be thoroughly overwhelmed by the downwind China coastal current(CCC) during the two big monsoon bloom events in the winter of 2007, and the CCC consequently extends southward throughout the western TWS instead. Most importantly, the variation of the spatial extent for the CWC and the CCC in the western TWS is found to be well explained by the first two modes of the vector empirical orthogonal function(VEOF) analysis, that is, it is mainly controlled by a wind-driven quasi barotropic current as the first mode and slightly modulated by a relatively weak background current with a first-order baroclinic structure as the second mode. 相似文献
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基于三维调和分离的同安湾口门断面冬季潮流和余流特征的分析 总被引：1，自引：0，他引：1
利用同安湾口门断面走航ADCP观测数据,采用基于高斯基函数的Candela空间插值方法,对海流进行空间三维的调和分离,并对分离的各分潮流与余流进行流场的回归检验分析,F(α=0.01)检验显示流场的回归效果显著.观测期间同安湾口门断面平均潮差为5.15 m,最小潮差4.38m,最大潮差5.98 m,断面上涨落潮最大流速分别为92.3、80.3 cm/s,潮流特征分析表明,同安湾口门断面的潮流运动形式为往复流,以半日潮流为主,约占70%潮流信息,潮流流速从海表面向海底递减.余流最大值为12.5 cm/s,空间分布上将同安湾口门断面一分为二形成北进南出的余流进出通道,这与以往余流格局的认识相符. 相似文献
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CODAS系统搭配相应质量控制参数,用以识别ADCP在复杂测流环境下测得的可疑或错误流速单元和剖面.通过水跟踪和底跟踪,CODAS系统可有效获取仪器自带数据处理软件vmdas、winriver无法修正的系统误差.本研究采用该系统对厦门湾走航ADCP测量数据做后续质量控制,所得相应系统误差如下：旋转角度偏差ΔФ=3.2°,幅值修正因子β=0.98.此外,以底跟踪测得流速为准确值,参考GPS数据经过系统误差订正后,流速精度显著提高,平均误差订正前后分别为28.9cm/s和11.6 cm/s.最后,结合现场数据采集工作与数据质量控制过程,总结数据质量问题一般特征并提出改进建议. 相似文献
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