The Role of Qiongzhou Strait in the Seasonal Variation of the South China Sea Circulation

Shi, Maochong; Chen, Changsheng; Xu, Qinghai; Lin, Huichan; Liu, Guimei; Wang, Hui; Wang, Fang; Jinhui, Yan

doi:10.1175/1520-0485(2002)032<0103:troqsi>2.0.co;2

Cited by 95 publications

(109 citation statements)

References 17 publications

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“…9) looks like a sort of pumping mechanism or flow rectification due to the presence of the slope and particularly to the nonlinear interaction of tides with bottom topography. This is in agreement with literature studies (Loder, 1980;Robinson, 1981;Wright and Loder, 1985;Tang and Tee, 1987;Loder et al, 1997;White and Bowyer, 1997;Shi et al, 2002) investigating the topographic rectification of tidal currents originating in nonlinearities that rectify the oscillatory tidal motion. This phenomenon occurs when two current components interact nonlinearly provided that both are in phase and thus correlate over a tidal cycle (Robinson, 1981;Clarke, 1991).…”

Section: Discussionsupporting

confidence: 93%

Vertical structure of currents in the vicinity of the Iceland-Scotland Ridge

2005

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Abstract. An analysis of current profiles carried out on moored Acoustic Doppler Current Profiler data sets recorded during the Variability of Exchanges In the Northern Seas project is presented here for several locations in three sections in the vicinity of the Iceland-Scotland Ridge: (1) north of the Faroes, (2) in the Faroe-Bank Channel and (3) in the Faroe-Shetland Channel. Total currents have been decomposed into three components, namely the mean residual flow, tide and surge. The mean residual flow is found to be dominant. Results for the major tidal constituents (M 2 , S 2 , N 2 , O 1 and K 1 ) are shown and discussed. It is found that the predominant tidal harmonic M 2 becomes steered through depth to align with the bottom topography. The mean residual flow is found to be generally larger than the surge, particularly in the Faroe-Bank Channel below 500 m depth where it is the dominant component. Here tidal rectification, i.e. the topographic rectification of tidal currents originating in nonlinearities that rectify the oscillatory tidal motion, is identified as the process enhancing the large mean residual currents found. From the current structure, two water masses are identified in the channel: the upper slowing moving inflow water and the colder outflow water characterised by a 3-6-day periodicity. In the Faroe-Shetland Channel the flow is characterised by large tidal currents, particularly in shallow waters. Instead, north of the Faroes none of the component was identified as dominant. The results show that the variability of the current components is strongly dependent upon topography and water depth.

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Section: Discussionsupporting

confidence: 93%

Vertical structure of currents in the vicinity of the Iceland-Scotland Ridge

2005

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“…[2002] (red ellipses) are shown in Figure 9 and Table 2. The distances between sites , , , and from Shi et al [2002] and our shipboard ADCP track (the common section) are 3.8, 3.1, 3.7, and 1.5 km, respectively (Figure 9a). The distributions of the depth-averaged diurnal and semidiurnal tidal ellipses in the top 40 m are similar to those of Shi et al [2002] (Figures 9a and 9c).…”

Section: Comparisons With Other Studiesmentioning

confidence: 99%

“…We also compared the results from the classical harmonic analysis method (v 0 , MSf, O 1 , M 2 included; K 1 &P 1 inferred from O 1 ; K 2 &S 2 inferred from M 2 ) with the data from Shi et al [2002] (Figures 9e-9h, Table 2). The distributions of the tidal ellipses estimated by the classical tidal harmonic analysis are roughly in agreement with that reported by Shi et al [2002], not only in the depth-averaged horizontal view (Figures 9e and 9g) but also in the vertical structures (Figures 9f and 9h).…”

Section: Comparisons With Other Studiesmentioning

confidence: 99%

“…A component of the southwestward tidal wave bifurcates near Hainan Island (Figure 1), propagates into the Beibu Gulf from its southern boundary, and then approaches the QS from its western side. When tidal waves enter the QS, the diurnal and semidiurnal waves propagate in opposite directions [Cao and Fang, 1990], and nonlinear interaction is expected after they meet each other in the QS [Shi et al, 2002].…”

Section: Introductionmentioning

confidence: 99%

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Tidal and residual currents in the Qiongzhou Strait estimated from shipboard ADCP data using a modified tidal harmonic analysis method

Zhu

Guo

et al. 2014

J. Geophys. Res. Oceans

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In spring 2013, 33 repeat shipboard Acoustic Doppler Current Profile (ADCP) surveys were conducted to measure the tidal current in the Qiongzhou Strait (QS). The major tidal currents and the residual current along a section across the QS were estimated using a modified tidal harmonic analysis method based on the inverse technique. A simple simulation and comparisons with previous observations demonstrated that the tidal currents estimated using the modified tidal harmonic analysis method are reasonable, and this method was able to control the magnitude and deviation of the estimation error. The direction of the major axis of tidal current ellipses is generally along the strait. Diurnal tidal constituents are dominant among the five tidal current constituents (K 1 , O 1 , M 2 , S 2 , and MSf). The ratio of the amplitudes of O 1 , K 1 , M 2 , S 2 , and MSf, averaged along the section across the QS is 1:0.79:0.42:0.27:0.29. The residual current along the entire section is all westward; the averaged velocity over the section is 6.062.1 cm s 21 ; the associated volume transport through the section is 20.065 6 0.046 Sv (Sv 5 10 6 3 m 3 s 21 ), in which the second value denotes the uncertainty of first value. Dynamic analysis indicates that tidal current activity is more dominant than mean current and eddy activity, and tidal rectification and sea level difference between two entrances of the QS are important in maintaining the residual current through the strait.

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“…Centered at 20°09′N 110°16′E [65], the Qiongzhou Strait is about 70 km long and 30 km wide, and with a maximum depth of 120 m [64] and the narrowest width of only 18 km [66].…”

Section: Glance At Qiongzhou Straitmentioning

confidence: 99%

Risk Assessment of Nautical Navigational Environment Based on Grey Fixed Weight Cluster

Tian

Sun

Chen

et al. 2017

PROMET

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In order to set up a mathematical model suitable for nautical navigational environment risk evaluation and systematically master the navigational environment risk characteristics of the Qiongzhou Strait in a quantitative way, a risk assessment model with approach steps is set up based on the grey fixed weight cluster (GFWC INTRODUCTION 1.1 Research backgroundMaritime risk is one of the most important focus areas for waterway transportation. Researchers and maritime authorities have been paying special attention to the risky areas where traffic density is high for a long time. The high density and high risk for transportation increase the complexity of navigation safety management [1].Nowadays, lots of theories and models have been developed for maritime risk assessment. The concept of risk management gives risk assessment priority over taking response measures after an accident [2]. Reasonable and effective risk assessment and prediction of vessel traffic system have been studied in depth [3].There is no doubt that it is of great significance to evaluate nautical navigation environment appropriately, which demands enough of the original data, proper theories, and suitable mathematical models, etc. Related studies [4,5] show that the grey clustering decision-making, which is an important component of grey theory, is suitable for cluster analysis in case of a lack of data or object information. Given the above views, a grey fixed weight cluster (GFWC) model with implementation scheme will be established in this paper for comprehensive risk assessment of nautical navigational environment. Whereby: (1) as the fundamental step when carrying out an evaluation work, the evaluation index system is designed to be structured scientifically through literature review and expert investigation, (2) as one of the indispensable components, relative weight of each YANFEI TIAN, Ph.D. candidate 1,2

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The Role of Qiongzhou Strait in the Seasonal Variation of the South China Sea Circulation

Cited by 95 publications

References 17 publications

Vertical structure of currents in the vicinity of the Iceland-Scotland Ridge

Vertical structure of currents in the vicinity of the Iceland-Scotland Ridge

Tidal and residual currents in the Qiongzhou Strait estimated from shipboard ADCP data using a modified tidal harmonic analysis method

Risk Assessment of Nautical Navigational Environment Based on Grey Fixed Weight Cluster

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