| 摘要: |
| 利用1992年在太湖北岸马迹山地区测得的浅水风浪资料，采用FFT方法求算风浪频谱，对谱结构特征的分析表明，观测到的风浪谱在平衡范围谱值按-4.0幂指数衰减，风浪谱形状与文圣常给出的理论结果比较接近。另外，分析以风要素为参量得到的无因次化频谱可以看出，观测谱基本满足谱的相似律。 |
| 关键词: 太湖 风浪谱 特征分析 |
| DOI： |
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| ANALYSIS OF THE WIND WAVE SPECTRUM CHARACTER IN THE NORTH BANK OF TAIHU LAKE |
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Pang Yong1, Pu Peimin1, Hu Weiping1, Qiao Shuliang2
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1.Nanjing Institute of Geography and Limnology, Academia Sinica Nanjing 210008;2.Nanjing Hydrolic Research Institute, Nanjing 210005
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| Abstract: |
| A wave height instrument for obtaining wind wave data was placed about 1.5m below water surface and 50m from the bank of Taihu Lake in Majishan district, Wuxi in 1992. The sampling time was 0.1s and the observed mean wave height was about 30cm, the mean cycle time was about 2.0s. During the wave observation, wind direction and speed were also observed with an electrolytic wind instrument placed 10m above the ground. The wind data computed and analysed in this study were basically short-distance wind range and long-time constant wind direction data, Analysis of wind wave spectra computed with FFT method show that: 1) the spectrum curves are more narrow and steeper than that of P—M spectra observed in the ocean area; 2) the spectrum value in the balance range decreases according to a -4.0 power exponential function; 3) the spectrum outline is similar to that in the theory proposed by Wen Shengchang; and 4) the observed spectra obey the analogous law of wind wave spectra. |
| Key words: Taihu Lake, Wind wave spectra, The character analysis |
