By means of three dimensional POM model,which computes the eddy viscosity coefficient based on two order turbulent closed model,the tide and tidal current in the Beibu Gulf are simulated with fine grid.In the comput...By means of three dimensional POM model,which computes the eddy viscosity coefficient based on two order turbulent closed model,the tide and tidal current in the Beibu Gulf are simulated with fine grid.In the computed region,six islands are considered and the bottom friction coefficients are taken to be various values from the difference of sea region.Acquired tidal harmonic constants are compared with that of 81 tidal observatories.The absolute mean error of K 1 constituent amplitude is 4 6 cm and of the lag is 9°.The absolute mean error of O 1 constituent amplitude is 5 6 cm and of the lag is 7°.The absolute mean error of M 2 constituent amplitude is 6 2 cm and of the lag is 15°.The tide,tidal current,residual water level and tide induced residual current,as well as the vertial distribution of horizontal velocity in this sea region are analysed by the simulated results.展开更多
In this paper, a new fully-digital high frequency （HF） radar system OSMAR-SD （ocean state measuring and analyzing radar, S-smaller, D-digital） is employed for observation of the tidal current over the Beibu Gulf, ...In this paper, a new fully-digital high frequency （HF） radar system OSMAR-SD （ocean state measuring and analyzing radar, S-smaller, D-digital） is employed for observation of the tidal current over the Beibu Gulf, South China Sea. This system can operate at two frequencies to achieve wider range and better resolution of measurement. Experimental results show that the radar measurements agree with the tide level data well. The environmental noise level is also analyzed to demonstrate its detrimental effect upon the measurement, the period of this effect is about 24 h. Moreover, it＇s the first time that the characteristic of the irregular diurnal tide over Beibu Gulf is clearly measured by HF radar.展开更多
文摘By means of three dimensional POM model,which computes the eddy viscosity coefficient based on two order turbulent closed model,the tide and tidal current in the Beibu Gulf are simulated with fine grid.In the computed region,six islands are considered and the bottom friction coefficients are taken to be various values from the difference of sea region.Acquired tidal harmonic constants are compared with that of 81 tidal observatories.The absolute mean error of K 1 constituent amplitude is 4 6 cm and of the lag is 9°.The absolute mean error of O 1 constituent amplitude is 5 6 cm and of the lag is 7°.The absolute mean error of M 2 constituent amplitude is 6 2 cm and of the lag is 15°.The tide,tidal current,residual water level and tide induced residual current,as well as the vertial distribution of horizontal velocity in this sea region are analysed by the simulated results.
基金Supported by the Ocean Public Welfare Scientific Research Project(201205032-3)the National Key Scientific Instrument and Equipment Development Project(2013YQ160793)
文摘In this paper, a new fully-digital high frequency （HF） radar system OSMAR-SD （ocean state measuring and analyzing radar, S-smaller, D-digital） is employed for observation of the tidal current over the Beibu Gulf, South China Sea. This system can operate at two frequencies to achieve wider range and better resolution of measurement. Experimental results show that the radar measurements agree with the tide level data well. The environmental noise level is also analyzed to demonstrate its detrimental effect upon the measurement, the period of this effect is about 24 h. Moreover, it＇s the first time that the characteristic of the irregular diurnal tide over Beibu Gulf is clearly measured by HF radar.
