| 摘要: |
| 本文选用第三代海浪模式SWAN（SimulatingWAveNearshore），以CCMP（Cross-Calibrated Multi-Platform）风场作为驱动风场，数值模拟了2015年3月份和2016年1月份影响浙江省的两次典型寒潮，并将模拟结果与实测数据进行了对比，模拟误差均在20%之内，属于正常范围，表明SWAN模型和CCMP风场能够较好地满足此次寒潮浪数值模拟的需要。本文从风场的强度、最值风速、风向、持续时间等方面，对比了两次寒潮期间的寒潮风场；从寒潮浪的强度、最值波高分布、持续时间、涌浪分布区域等方面，对两次典型寒潮期间的寒潮浪时空分布的异同进行了研究。总体而言，2015年3月份寒潮的风场从强度上弱于2016年1月份寒潮，3月份寒潮风场的主流大风是6-7级风，风向偏正北风；1月份寒潮风场的主流大风是6-8级风，风向偏西北风。2015年3月份的寒潮浪从强度上弱于2016年1月份寒潮浪，3月份寒潮浪波高变化剧烈的区域处于研究区域的东北部，1月份寒潮浪波高变化剧烈的区域处于研究区域的中部和东部；3月份寒潮浪的大浪主要是5级浪，1月份寒潮浪的大浪主要是5、6级浪。当寒潮对研究区域的波浪场影响最为显著时，2015年3月份寒潮期间研究区域的北部多为涌浪，2016年1月份寒潮期间研究区域的南部多为涌浪。 |
| 关键词: SWAN模式 CCMP风场 寒潮浪 数值模拟 分布规律 对比研究 |
| DOI： |
| 分类号:P733 |
| 基金项目:国家重点研发计划(2017YFA0604100, 2017YFC1404000); 国家自然科学(41876086); 浙江省海洋与渔业局资助项目[Foundation: the National Key Research and Development Plan,No. 2017YFA0604100 and 2017YFC1404000; the Natural Science Foundation ofChina, No. 41876086; The Foundation of Zhejiang Ocean and Fishery Bureau] |
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| Numerical simulation of typical cold waves in Zhejiang |
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Zheng Qiao1, zhangjicai1, Che Zhumei2, Zhu Ye2
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1.Ocean College, Zhejiang University;2.The Ocean and Fisheries Bureau, Zhejiang Province, Hangzhou
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| Abstract: |
| In this study, the third-generation wave simulation model SWAN (Simulating WAve Nearshore) was used to study the waves induced by cold fronts, and the CCMP (Cross-Calibrated Multi-Platform) wind field was used as the wind forcing field. The two typical cold fronts which affected the adjacent seas of Zhejiang Province in March 2015 and January 2016 were simulated and the simulation results were compared with the observation data. The error was controlled within 20%, which was within the normal range, indicating that the SWAN model and CCMP could satisfy the requirements of the numerical modelling of ocean waves caused by the cold fronts. The wind fields in two typical cold front events were compared from the aspects of intensity, maximum wind speed, wind direction and wind duration; in addition, the corresponding waves in two events were also compared from the aspects of intensity, maximum wave height, duration, and surge distribution. On the whole, the wind fields in the cold front event in January 2016 was stronger than those in March 2015 event; the main wind speed in March 2015 was Grade 6-7 whose prevailing direction was mainly north, while the main wind speed in January 2016 was Grade 6-8 whose prevailing direction was mainly northwest. The resulting wave intensity in January 2016 was stronger than the wave intensity in March 2015. The area where the wave height changed drastically in March 2015 was in the northeast of the study region, while in the middle and eastern part of the study region for January 2016. The larger wave in the cold event in March 2015 was mainly Grade 5, while the larger waves in January 2016 were mainly Grade 5-6. The distribution of swell in these two cold events was also studied. When the cold fronts had the most significant impact on the study region, the northern part of the study region during March 2015 was swell; contrarily, the southern part of the study region during January 2016 was swell. |
| Key words: SWAN model CCMP cold fronts wave numerical simulation distribution comparative study |