| 摘要: |
| 风浪状态参数常用于对海面粗糙度的参数化。中等风速条件下考虑风浪状态参数影响的海 面粗糙度参数化方案常存在自相关效应, 本文通过分析实测数据得到了无量纲粗糙度随波陡变化的 参数化方案, 该方案能够有效去除自相关效应; 高风速下风浪状态对海面粗糙度仍存在影响, 文中 基于新得出的中等风速下的海面粗糙度参数化方案, 考虑海面飞沫悬浮层的影响, 建立了适用于高 风速条件下的海面粗糙度参数化方案, 该海面粗糙度方案同样考虑了波陡的作用, 将该方案计算出 的理论值与实测数据进行比对, 发现随着波陡的变化, 理论值基本涉及测量值的覆盖范围, 说明新 建立的高风速条件下海面粗糙度方案对海面风浪状态具有较好的敏感性, 且该方案能够较合理地描 述海气界面之间动量传输。将新提出的适用于高风速下的海面粗糙度方案加入到海浪数值模式中, 模拟飓风Ivan 产生的台风浪, 利用浮标数据进行验证, 结果显示模拟的有效波高相对模式默认方案 具有较高的精度, 说明采用本文新建立的适合高风速的海面粗糙度方案能够改进海浪模式的台风浪 有效波高模拟结果。 |
| 关键词: 风浪状态 海面粗糙度 高风速条件 |
| DOI：10.11693/hyhz20150700185 |
| 分类号: |
| 基金项目:江苏省自然科学基金项目, BK20131066 号; 国家自然科学基金项目, 41106014 号。 |
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| THE INFLUENCE OF WIND WAVE STATE ON SEA SURFACE ROUGHNESS |
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SHI Jian1,2, JIANG Guo-Rong1
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1.College of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China;2.State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, PLA University of Science and Technology, Nanjing 210007, China
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| Abstract: |
| Wind wave parameters are often used to calculate the sea surface roughness. In a moderate wind speed condition, there is an auto-correlation effect in sea surface roughness parameterization scheme when wind wave state is considered. We developed a dimensionless roughness parameterization scheme in relation to wave slope parameter with observational data, in which the auto-correlation effect can be avoided. In high wind speed however, wave state can still affect sea surface roughness. In the new parameterization scheme in consideration of spray suspension layer at surface, a new sea surface roughness can be used in high-wind speed condition, and parameterized by wave slope parameter too. The theoretical sea surface roughness and observational data agree largely with each other, indicating sensitivity of sea surface roughness to wind wave state. The new scheme can describe momentum flux at air-sea interface more reasonably. We applied the scheme in high wind speed status and integrated it into a wave model, with which typhoon wave generated from hurricane Ivan was modeled. Comparison to buoy data, the modeled significant wave height matched well. Therefore, the new scheme can improve typhoon wave height simulation in a wave model. |
| Key words: wind wave state sea surface roughness high wind speed condition |
