| 摘要: |
| 建立了一个太湖水温数值模型,模拟太湖平均水温的日变化过程。应用本模式和由太湖气象水文数据自动采集系统测得的资料(1990年9月26—27日)分析了气温、湿度和风速对水温的影响。由计算和数值试验结果看出,本模式较好地模拟出了选定的两天中水温变化过程;随着空气温度的增加,水温线性增加;在空气相对湿度较大或风速较小时,它们的变化对水温有较大的影响。 |
| 关键词: 数值模型 水温 气象参数 太湖 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金,4880207号 |
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| A WATER TEMPERATURE MODEL FOR TAIHU LAKE AND METEROLOGICAL INFLUENCE ON WATER TEMPERATURE |
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She Fengning, Cai Qiming, Xu Yongji
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Nanjing Institute of Geography and Limnology, Academia Sinica 210008
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| Abstract: |
| A water temperature model was developed in this paper based on the equation of heat balance in water. The daily variations of Water temperature in Taihu Lake during two days in September, 1990 were stimulated successfully with the model and data from a hydro-meterological observation system.
The influence of air temperature, humidity and wind speed on water temperature were also studied with the method of numinical experiment. The results showed as follows.
1. Water temperature varies linearly with daily average of air temperature. Its variation slope is influenced by the air turbulivity. Water temperature could change considerably with air temperature variation when turbulent exchange is strong, while was affected little by the daily vibration amplitude of air temperature.
2. Water temperature varies exponentially with relative humidity. With high air humidity the vaporation is great affected by humidity change and with low humidity it is mainly affected by air turbulivity.
3. Water temperature dropped logarithmicly with the rise of wind speed on the water surface, The influence of wind change on water temperature is depended on the strength of furbulent exchange.
It is shown that water temperature is comprehensively affected by meterological factots, such as air temperature and humidity, wind speed, radiation, presure and etc. In this paper, only is a sinigle sample of water temperature change in a specific circumstance discussed to test the reliability of this model and analysis some relations between water temperature and meterological factors. |
| Key words: Numerical model, Water temperature, Meterological influence, Taihu Lake |
