| 摘要: |
| 台湾海峡内的潮运动是相当强烈和复杂的,一方面由于自海峡外传入的两支太平洋潮波在海峡内传播、相汇,形成强烈的潮运动;另一方面海峡内地形的复杂和岸线的曲折又使海峡内潮汐、潮流的分布变得特别复杂。自80年代以来,国内学者对海峡内的潮汐、潮流进行了不少研究(丁文兰,1983;方国洪等,1985;叶安乐等,1985,1986;李立等,1990；陈新忠,1983;郑文振等,1982),并获得了有价值的成果。但是,他们对海峡内潮运动的过程、性质等尚有许多不同的看法。例如,关于M2分潮最大流速同潮时线的分布状况,以上学者的结论各不相同,有的甚至差异很大。对海峡内M2分潮最大流速同潮时线聚点(即圆流点)的问题也有两种观点。关于潮流分布状况,由于实测流资料缺乏,尽管已有的研究在潮流极值区的出现位置上基本达成共识,但在潮流流速量值的大小问题上仍有诸多分歧。
鉴于上述研究现状,为了对海峡内潮汐、潮流的分布状况有更准确、细致的认识,以便弄清海峡内潮过程在上升流形成过程中的作用,本文在已有研究的基础上,重新对台湾海峡内的潮汐、潮流作了数值计算。我们将讨论的重点放在以往研究中有争议的问题上,依据计算结果并结合实测资料提出我们的见解。 |
| 关键词: 福建沿岸、上升流、台湾海峡潮汐、潮流 |
| DOI： |
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| 基金项目:中国科学院海洋研究所调查研究报告第2331号
本课题为国家重点基金资助项目，49136140号 |
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| NUMERICAL STUDY ON UPWELLING ALONG FUJIAN COAST I. NUMERICAL MODELING ON TIDE AND TIDAL CURRENT IN THE TAIWAN STRAIT |
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Yan Tingzhuang, Wu Yongcheng
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Institute of Oceanology, Academia Sinica
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| Abstract: |
| To study the effect of tidal mixture on the formation of upwelling along the Fujian coast, The tide and tidal current in the Taiwan Strait were calculated with the method of ADI and splitting operator. The present results show that the M2 components of tidal wave entering the Strait from the south are stronger than those calculated previously and can influence the region adjoining Jinmen island.The section linked by two points, Weitou (24°40′N, 118°30′E) and Xianxi (24°11'N,120°25′E), can be considered as the middle line of demarcation of the Strait. In the south and north sides of the Strait. The M2 constituent features are determined mainly by the two M2 tidal waves entering the Strait from the south and north,respectively. The section linked by Weitou and Xianxi is the intersect of the two branches of the M2 tidal waves.
Affected by sea bottom topography, coastal line and tidal wave propagation, there are three regions with high tidal current velocity and two regions with low tidal current velocity in the Taiwan Strait. Tidal current velocity is high in the vicinity of the Haitan, Nanri, Penghu islands and Taiwan shoal, and low at the south-east side of Taiwan and the middle Strait. Results obtained from the model show that maximum velocity of M2 tidal current is 2.0 m/s which appears in the offshore of Haitan island. Velocities in the low tidal current velocity region are generally about 0.1m/s-0.3m/s.
Average values of amplitude and phase of K1 and O1 constituents representing amplitude and phase of M2 constituent were used to calculate M1 tide and M1 tidal current. |
| Key words: UPWELLING,FUJIAN COAST,TAIWAN STRAIT,TIDE,TIDAL CURRENT |
