运用一个含动边界的二维河口海岸动力模型模拟了福清湾潮汐潮流的基本特征,模拟结果与实测数据吻合较好.在此基础上估算了福清湾涨落潮流历时,分别为6 h 19 min 2 s和6 h 3 min 48 s;大小潮周期的纳潮量,分别为10.94×107和4.47...运用一个含动边界的二维河口海岸动力模型模拟了福清湾潮汐潮流的基本特征,模拟结果与实测数据吻合较好.在此基础上估算了福清湾涨落潮流历时,分别为6 h 19 min 2 s和6 h 3 min 48 s;大小潮周期的纳潮量,分别为10.94×107和4.47×107m3;福清湾的半交换和80%的交换周期分别为3和6 d.最后,以COD为例,给出了在排放稳定后保守污染物的分布特征.展开更多
The barotropic processes of tides, tidal currents, wind-driven currents and the interaction of winds andtides in the Bobai Sea are investigated with a three-dimensional shelf sea model. The tides and tidal currents ar...The barotropic processes of tides, tidal currents, wind-driven currents and the interaction of winds andtides in the Bobai Sea are investigated with a three-dimensional shelf sea model. The tides and tidal currents are wellsimulated. The main characteristics of tides and tidal currents, such as the types of tides and tidal currents, co-tidaland co-range charts, co-current charts, tidal ellipses, mean tidal currents and tidal residual currents are presented. Apair Of cyclonic and anticyclonic headland eddies in the northern Bohai Straits is discovered. The tidal currents have little vertical structure except close to the sea bottom. Driven by strong winds, the currents have a significant three-dimensional structure. In response to coastal geometry and bottom friction, the wind drift in the upper layers is in the direction of the wind or slightly to the right. In depth, considerable compensating currents maintain a circulation balance. The interaction of winds and tides is locally strong. The oscillating tidal currents play a role of dissipating energy. Thus the usual purely wind-driven currents in the area of weak residual tidal currents are often overestimated in theabsence of tides.展开更多
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
underwater topography is one of oceanic features detected by Synthetic Aperture Radar.Underwater topography SAR imaging mechanism shows that tidal current is the important factor for underwater topography SAR imaging....underwater topography is one of oceanic features detected by Synthetic Aperture Radar.Underwater topography SAR imaging mechanism shows that tidal current is the important factor for underwater topography SAR imaging.Thus under the same wind field condition,SAR images for the same area acquired at different time include different information of the underwater topography.To utilize synchronously SAR images acquired at different time for the underwater topography SAR detection and improve the precision of detection,based on the detection model of underwater topography with single SAR image and the periodicity of tidal current,a detection model of underwater topography with a series of SAR images acquired at different time is developed by combing with tide and tidal current numerical simulation.To testify the feasibility of the presented model,Taiwan Shoal located at the south outlet of Taiwan Strait is selected as study area and three SAR images are used in the underwater topography detection.The detection results are compared with the field observation data of water depth carried out by R/V Dongfanghong 2,and the errors of the detection are compared with those of the single SAR image.All comparisons show that the detection model presented in the paper improves the precision of underwater topography SAR detection,and the presented model is feasible.展开更多
文摘运用一个含动边界的二维河口海岸动力模型模拟了福清湾潮汐潮流的基本特征,模拟结果与实测数据吻合较好.在此基础上估算了福清湾涨落潮流历时,分别为6 h 19 min 2 s和6 h 3 min 48 s;大小潮周期的纳潮量,分别为10.94×107和4.47×107m3;福清湾的半交换和80%的交换周期分别为3和6 d.最后,以COD为例,给出了在排放稳定后保守污染物的分布特征.
文摘The barotropic processes of tides, tidal currents, wind-driven currents and the interaction of winds andtides in the Bobai Sea are investigated with a three-dimensional shelf sea model. The tides and tidal currents are wellsimulated. The main characteristics of tides and tidal currents, such as the types of tides and tidal currents, co-tidaland co-range charts, co-current charts, tidal ellipses, mean tidal currents and tidal residual currents are presented. Apair Of cyclonic and anticyclonic headland eddies in the northern Bohai Straits is discovered. The tidal currents have little vertical structure except close to the sea bottom. Driven by strong winds, the currents have a significant three-dimensional structure. In response to coastal geometry and bottom friction, the wind drift in the upper layers is in the direction of the wind or slightly to the right. In depth, considerable compensating currents maintain a circulation balance. The interaction of winds and tides is locally strong. The oscillating tidal currents play a role of dissipating energy. Thus the usual purely wind-driven currents in the area of weak residual tidal currents are often overestimated in theabsence of tides.
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The National Natural Science Foundation of China under contract Nos 60672159 and 60890075the State Oceanic Administration Science Foundation for Youths under contract No.2009421the Special Funds for Marine Commonweal Research under contract No.200705027
文摘underwater topography is one of oceanic features detected by Synthetic Aperture Radar.Underwater topography SAR imaging mechanism shows that tidal current is the important factor for underwater topography SAR imaging.Thus under the same wind field condition,SAR images for the same area acquired at different time include different information of the underwater topography.To utilize synchronously SAR images acquired at different time for the underwater topography SAR detection and improve the precision of detection,based on the detection model of underwater topography with single SAR image and the periodicity of tidal current,a detection model of underwater topography with a series of SAR images acquired at different time is developed by combing with tide and tidal current numerical simulation.To testify the feasibility of the presented model,Taiwan Shoal located at the south outlet of Taiwan Strait is selected as study area and three SAR images are used in the underwater topography detection.The detection results are compared with the field observation data of water depth carried out by R/V Dongfanghong 2,and the errors of the detection are compared with those of the single SAR image.All comparisons show that the detection model presented in the paper improves the precision of underwater topography SAR detection,and the presented model is feasible.
