| 摘要: |
| 初步分析研究了太湖定振波的变化规律,结果表明:(1)东、西太湖有各自的振动周期,东太湖变化范围在181-292min,平均为243min;西太湖在120-540min,平均为400min。(2)观测到的最大振幅(1/2波高)为120-130mm。(3)用差分法对定振波的特征值进行了近似估算,其周期误差为20min。(4)定振波引起的湖流相当大,当振幅为100mm时,最大流速可达±20cm/s。(5)定振波振幅的突变与气压场、风场和降水分布不均匀并在短期内发生突变有关。 |
| 关键词: 定振波 太湖 |
| DOI：10.18307/1992.0404 |
| 分类号: |
| 基金项目: |
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| A preliminary study on seiches in Taihu Lake |
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Zhang Wenhua
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Nanjing Institute of Gography and Limnology, Academia Sinica, Nanjing 210008
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| Abstract: |
| Characteristics of seiches in Taihu Lake are analysed preliminarily.The results show that; (1) The os-cilation periods of seiches in East Taihu Lake vary from 180 to 291 minutes,with an average value of 243 minutes and those in West Taihu Lake vary from 120 to 540 minutes with an average value of 400 minutes.(2) The observed maximum amplitude of seiches in Taihu Lake is about 120-130mm.(3) The characteristics of the seiches are estimated by the difference equection, and the estimating error in the periods is about 20 minutes.(4) The water current in the lake by the seiches is quite large.The maximum current speed is about 20cm/s when the seiche amplitude is 100mm.(5) The amplitude variation of seiches is related to the air pressure,wind field and rainfall above the lake. |
| Key words: Seiche Taihu Lake |
