Journal of Marine Sciences ›› 2021, Vol. 39 ›› Issue (4): 109-122.DOI: 10.3969/j.issn.1001-909X.2021.04.011

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HighFrequency ground wave radar observation and analysis of tidal current distribution in the Niubishan Channel of Xiangshangang Bay#br#

As the pilot of constructing HighFrequency(HF) ground wave radar observation network in LORCE plan, a pair of OSMARS50 HF ground wave radar was set up in Guojushan and Baimajiao of Liuheng Island, facing the Niubishan Channel of Xiangshangang Bay. To verify the accuracy of the synthesis surface current from HF ground wave radars, 25 hcontinuous observations were carried out using the Valeport Propeller Current Profiler and ADCP in the core of the effective area of this pair of HF ground wave radar. Comparison of currents shows a good correlation between data from the fixedpoint current and the HF ground wave radars, which suggests that currents obtained by the HF surfacewave radars at this point have a relatively high accuracy. At the same time, the availability of the HF ground wave radar data in large region is also tested by simulated results using a regional model established by SCHISM. Results show that the observation and simulation are consistent in the general trend: the Niubishan Channel is a regular semidiurnal tidal area, and M2 is the main tidal component, while the semidiurnal tidal component M2 and full diurnal tidal component K1 are mainly reciprocating currents. During flood tide, the sea water flows to the interior of Xiangshangang Bay first through the Niubishan Channel, and then to the Fodu Channel after a period of time. During ebb tide, the sea water in Xiangshangan Bay first flows out to the sea through the Niubishan Channel, and then the sea water from Fodu Channel gradually flows into the Niubishan Channel.#br#

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  • Online:2021-12-15 Published:2022-01-25

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Abstract: As the pilot of constructing HighFrequency(HF) ground wave radar observation network in LORCE plan, a pair of OSMARS50 HF ground wave radar was set up in Guojushan and Baimajiao of Liuheng Island, facing the Niubishan Channel of Xiangshangang Bay. To verify the accuracy of the synthesis surface current from HF ground wave radars, 25 hcontinuous observations were carried out using the Valeport Propeller Current Profiler and ADCP in the core of the effective area of this pair of HF ground wave radar. Comparison of currents shows a good correlation between data from the fixedpoint current and the HF ground wave radars, which suggests that currents obtained by the HF surfacewave radars at this point have a relatively high accuracy. At the same time, the availability of the HF ground wave radar data in large region is also tested by simulated results using a regional model established by SCHISM. Results show that the observation and simulation are consistent in the general trend: the Niubishan Channel is a regular semidiurnal tidal area, and M2 is the main tidal component, while the semidiurnal tidal component M2 and full diurnal tidal component K1 are mainly reciprocating currents. During flood tide, the sea water flows to the interior of Xiangshangang Bay first through the Niubishan Channel, and then to the Fodu Channel after a period of time. During ebb tide, the sea water in Xiangshangan Bay first flows out to the sea through the Niubishan Channel, and then the sea water from Fodu Channel gradually flows into the Niubishan Channel.

Key words: LORCE plan, Niubishan Channel, Highfrequency (HF) ground wave radar, tidal current

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