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长江口海域风浪场的计算与特征分析
耿浩博1, 张洪生1, 洪杨彬2, 胡国栋3
1.上海海事大学;2.浙江省嵊州市水利水电局;3.长江水利委员会长江口水文水资源勘测局
摘要:
以ECMWF数据资料作为输入风场,以ETOPO1地形数据和实测水深资料相结合作为计算水深,通过WAVEWATCH III和SWAN模型嵌套数值模拟了长江口海域1996年至2015年、连续20年的风浪场。为了在保证计算精度的同时提高计算效率,通过比较台风和寒潮期间的显著波高进行敏感性分析,从而选取了合适的计算范围和计算网格。通过与观测数据进行比较,发现显著波高的计算值变化趋势与观测结果一致,两者的相关系数为0.82。为了使模拟结果更接近实际,基于观测的波高,给出了具有代表性点位的显著波高修正公式,该公式可供今后的风浪场数值计算参考应用。根据风场数据资料和修正后的显著波高进行了风场和风浪场的特征统计分析,风浪特性分析的结果既体现了季节的影响,又体现了地形的影响。
关键词:  风浪场  风场  海浪模型  长江口  修正公式  统计分析
DOI:
分类号:
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目),上海市地方高校基地能力建设项目
Calculation and characteristic analyses of wind wave fields in the Yangtze Estuary
genghaobo1, zhanghongsheng1, hongyangbin2, huguodong3
1.Shanghai Maritime University;2.Zhejiang Shengzhou Water and Hydropower Bureau;3.Yangtze Estuary Hydrology and Water Resources Survey Bureau,Changjiang water resources commission,
Abstract:
The wind wave field near the Yangtze Estuary for 20 years (from 1996 to 2015) is simulated with SWAN nested in WAVEWATCH III, based on the European Centre for Medium-Range Weather Forecasts (ECMWF) wind field data and combining the 1 Minute Gridded Global Relief Data Collection (ETOP1) with the measured data as the calculated water depth. To simulate the wind waves precisely and improve the calculation efficiency, the sensitivity analyses of calculated significant wave heights during a typhoon and a cold wave are made so that the proper calculation domains and grid mesh types are selected. Comparing with the measured data the variation tendency of calculated significant wave heights are in agreement with that of observed ones, and the correlation coefficient is 0.82. In order to make the calculated wave heights more correspond to the actual ones, the formula for modifying the significant wave heights at the representative point is provided, which can be used for the future calculation of wind wave field. The wind and wave characteristics are analyzed statistically on the basis of the wind data and the modified significant wave heights. The results reflect the effects of both season and terrain effectively.
Key words:  wind wave field  wind field  wave model  Yangtze Estuary  modification formula  statistical analyses
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