基于第3代海浪模式WW3(WAVEWATCH-III),以具有高精度和较高分辨率的CCMP(Cross-Calibrated, Multi-Platform)风场为驱动场,对2011年12月发生在孟加拉湾的热带气旋“Thane”所致的大浪进行数值模拟。结果表明:(1)以CCMP风场驱动WW3海浪模式,可以较好地模拟热带气旋“Thane”在孟加拉湾造成的大浪,模拟的海浪数据具有较高精度。当有效波高(SWH)在2 m以内和大于5 m时,模拟值略小于观测值;当SWH在2~5 m之间时,模拟值略大于观测值。(2)热带气旋“Thane”所形成的大风和大浪的分布特征具有一定差异:大风区在气旋四周分布较为均匀;在大洋中部时,大浪区主要分布于右半圆,在近海时,大浪区主要分布于气旋行进方向的前方。(3)热带气旋“Thane”的风向和波向整体上保持了较好的一致性,仅在第2象限有一定的差异,该区域的风向主要为西北向,而波向则主要为偏北向。
Abstract
The wave field caused by tropical cyclone “Thane” in the Bay of Bengal during December 2011 was simulated by using WW3(WAVEWATCH-Ⅲ) wave model with CCMP (Cross-Calibrated, Multi-Platform) wind data as the driving field. Results show that: (1) With CCMP wind data as the driving field, the WW3 wave model can simulate the wave field caused by tropical cyclone “Thane” properly. The simulated SWH (significant wave height) has good consistent with the observed SWH. Simulated value is slightly smaller than observed value when the SWH is smaller than 2 meters or larger than 5 meters. The simulated value is slightly greater than observed value when the SWH is between 2 meters and 5 meters. (2) There are some differences between wind field and wave field caused by tropical cyclone “Thane”. The gale district distributes more evenly around the cyclone. When the cyclone is in the middle of the ocean, big wave areas mainly distribute in the right semicircle, and big wave areas mainly distribute in the front of the cyclone in offshore. (3) During tropical cyclone “Thane”, the wave direction has good consistency with the wind direction except the second quadrant. In the second quadrant, the wind direction is northwest, but the wave direction is north.
关键词
WW3模式 /
CCMP风场 /
孟加拉湾 /
热带气旋
Key words
WAVEWATCH-Ⅲ wave model /
CCMP wind field /
Bay of Bengal /
tropical cyclone
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基金
国家重点基础研究发展计划项目资助(2012CB957803);公益性行业(气象)科研专项(GYHY201306026)
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