Surface tidal currents in the open sea area to the east of the Zhoushan Islands measured with high frequency surface wave radar

Shen, Zhiben; Wu, Xiongbin; Fei, Yuejun; Xu, Xin; Chen, Xiaofeng

doi:10.1007/s13131-013-0359-4

Cited by 6 publications

(10 citation statements)

References 11 publications

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“…Then the TWWC is taken into account as a contributor of velocity component perpendicular to the tidal direction, which is about 0.2 m s 21 inferred from the profiles of slack/stand tide when the tidal effect could be ignored. The surface current speed reported by Shen et al (2013) is in the range of 0.2-2.3 m s 21 , and the average tidal stream is of 5-10 kW m 21 in that region, which is a mesotidal estuary. The mean tidal range is 2-3 m (Fang et al 2004), which is primarily the result of four main astronomical constituents.…”

Section: Figurementioning

confidence: 92%

A Sea Trial of Air-Lift Concept Artificial Upwelling in the East China Sea

Pan

Fan

et al. 2019

Journal of Atmospheric and Oceanic Technology

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Artificial upwelling (AU), as one of the geoengineering tools, has received worldwide attention because of its potential ability to actualize ocean fertilization in a sustainable way. The severe challenges of AU are the design and fabrication of a technologically robust device with structural longevity that can maintain the function in the variable and complex hydrodynamics of the upper ocean. In this work, a sea trial of an air-lift concept AU system driven by self-powered energy was carried out in the East China Sea (ECS; 30°8′14″N, 122°44′59″E) to assess the logistics of at-sea deployment and the durability of the equipment under extremely complex hydrodynamic conditions from 3 to 7 September 2014. Seawater below the thermocline layer was measured to be uplifted from approximately 30 m to the euphotic layer with a volumetric upwelling rate of 155.43 m3 h−1 and total inputs of 2.8 mol h−1 NO3−, 0.15 mol h−1 PO43−, and 4.41 mol h−1 SiO43−. A plume formed by cold, saline deep ocean water (DOW) was tracked by a drifting buoy system with a mixing ratio of 37%–51% DOW at the depth of 18–22 m, which conforms to the simulation results. During the AU’s application, disturbance in the vertical hydrological structure could be observed. However, diatom (Skeletonema costatum) blooming from somewhere in the outer ECS floated to the sea trial region on the second day after the AU’s application, which makes it hard to strip off the biochemical effects of AU from the effects of S. costatum bloom.

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Section: Figurementioning

confidence: 92%

A Sea Trial of Air-Lift Concept Artificial Upwelling in the East China Sea

Pan

Fan

et al. 2019

Journal of Atmospheric and Oceanic Technology

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“…where W O1 , W K1 , and W M2 are the lengths of the semi-major axes of the tidal ellipses of O1, K1, and M2, respectively. When F ≤ 0.5, the area is mainly affected by regular semi diurnal tidal currents; when 0.5 < F ≤ 2, the area is mainly affected by irregular semi diurnal tidal currents; when 2 < F ≤ 4, the area is mainly affected by irregular diurnal tides; and when F > 4, the area is affected by regular diurnal tides [33].…”

Section: Tidal Current Patternsmentioning

confidence: 99%

“…Coefficient F is used to describe characteristics of tidal ellipses and tidal currents. Tidal current patterns were assessed using [33]:…”

Section: Tidal Current Patternsmentioning

confidence: 99%

Assessment of Ocean Circulation Characteristics off the West Coast of Ireland Using HF Radar

Ren,

Pan,

Yang

et al. 2023

Remote Sensing

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Research on coastal ocean circulation patterns over long time periods is significant for various marine endeavors: environmental protection, coastal engineering construction, and marine renewable energy extraction. Based on sea surface current data remotely observed using a shore-based high frequency radar (HFR) system for one year (2016), spatiotemporal characteristics of surface flow fields of sea surface flow fields along the west coast of Ireland are studied using harmonic analysis, rotary spectral analysis and representative flow fields over different seasons and the whole year. Coastal surface currents in the study area are strongly affected by tidal dynamics of the M2 constituent, showing significant characteristics of regular semidiurnal tide, such as M2 and S2. The energy spectrum distribution indicates that the tidal constituents M2 and S2 are the dominant periodic energy constituents in a counterclockwise spectrum, which mainly presents rotating flow; the representative diurnal tidal constituents is the constituent K1, and its energy spectrum distribution is mainly clockwise. A comparison between probable maximum current velocity (PMCV) and measured maximum current velocity (MMCV) is presented. It shows that although tidal current characteristics in the study area are significant, the main driving force of the currents at the time of the maximum currents is wind energy. These results provide new insights into a region of huge societal potential at early stages of sustainable economic exploitation where few data currently exist.

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“…In order to further verify the feasibility of this scheme to measure lateral velocity, we analyzed the data acquired by HF radar named Ocean State Measuring and Analyzing Radar (OSMAR [12]) (24 • 16 N, 118 • 8.2 E) on January 17, 2015. For this, the parameters that were included are as follows: a working frequency of 7.8 MHz, eight array elements, a normal array direction of 135 • referencing to north, and a range bin of 5 km.…”

Section: Obtaining the Phase Varying Rate From The Experimentsmentioning

confidence: 99%

A Scheme to Measure Lateral Velocity by Radio Interferometry

Chen

2016

IEEE Geosci. Remote Sensing Lett.

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It is difficult to acquire lateral velocity in the current radar applications. In order to obtain the velocity vector, two or more radar sites are needed. However, it is of great cost, and it is difficult to achieve real-time measurement. In this letter, a scheme is proposed to measure lateral velocity based on radio interferometry with which two receiving channels are adopted to obtain an interference signal. A formula describing the relationship between the phase varying slope of the interference signal and the lateral velocity whose direction is parallel to the tangent of the ellipse whose foci are the position of two receiving antennas was deduced. To verify the feasibility of measuring the lateral velocity with the proposed scheme, simulations of the echo signal of the linear frequency modulation radar are carried out; the result shows that the proposed scheme is very effective. An experimental result with high-frequency radar of Wuhan University further verifies the feasibility of this scheme to measure lateral velocity.

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Surface tidal currents in the open sea area to the east of the Zhoushan Islands measured with high frequency surface wave radar

Cited by 6 publications

References 11 publications

A Sea Trial of Air-Lift Concept Artificial Upwelling in the East China Sea

A Sea Trial of Air-Lift Concept Artificial Upwelling in the East China Sea

Assessment of Ocean Circulation Characteristics off the West Coast of Ireland Using HF Radar

A Scheme to Measure Lateral Velocity by Radio Interferometry

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