| 引用本文: | 姚静,张奇,李云良,李梦凡.定常风对鄱阳湖水动力的影响.湖泊科学,2016,28(1):225-236. DOI:10.18307/2016.0126 |
| YAO Jing,ZHANG Qi,LI Yunliang,LI Mengfan.The influence of uniform winds on hydrodynamics of Lake Poyang. J. Lake Sci.2016,28(1):225-236. DOI:10.18307/2016.0126 |
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| 定常风对鄱阳湖水动力的影响 |
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姚静1, 张奇1,2, 李云良1, 李梦凡1,3
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1.中国科学院南京地理与湖泊研究所, 中国科学院流域地理学重点实验室, 南京 210008;2.江西师范大学, 鄱阳湖湿地与流域研究教育部重点实验室, 南昌 330022;3.中国科学院大学, 北京 100049
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| 摘要: |
| 鄱阳湖属大风区,风场作为仅次于流域"五河"倾泻和长江顶托作用的另一重要驱动力,或在某些时刻影响局部区域的水流结构,进而影响局部水体中泥沙、污染物、营养盐等物质的输移和扩散.基于鄱阳湖二维水动力数学模型,模拟定常风场条件下的鄱阳湖流场分布及环流形式,并与无风条件下的水流时空结构进行对比.结果表明:3.03m/s的NE向和SSW向定常风对湖泊水位影响微弱;对流速的影响主要集中在7月中旬至9月底的"湖相"期;其影响区域主要分布在湖区中部大湖面偏西岸及东部湖湾,约占湖泊最大水面积的16%;上述区域出现明显环流,环流结构具有时空异质性特点,环流区流速普遍增至无风时的两倍以上;NE向和SSW向风场产生的环流位置相近,方向相反.相比于以往鄱阳湖水动力研究中对风场的忽略,本次研究揭示了定常风场对鄱阳湖的重点影响区域、影响程度及影响形式,可为泥沙及污染物输移模拟中对风场条件的处理及可能带来的误差与误差的空间分布提供重要依据. |
| 关键词: 水动力模拟 定常风 风生环流 鄱阳湖 |
| DOI：10.18307/2016.0126 |
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| 基金项目:国家重点基础研究发展计划"973"项目(2012CB417003)、江西省重大生态安全问题监控协同创新中心项目(JXS-EW-00)和国家自然科学基金项目(41301023,41371062)联合资助. |
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| The influence of uniform winds on hydrodynamics of Lake Poyang |
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YAO Jing1, ZHANG Qi1,2, LI Yunliang1, LI Mengfan1,3
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1.Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang 330022, P. R. China;3.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
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| Abstract: |
| Lake Poyang is a strongly wind-affected region. The wind stress, as the secondary driver after the catchment forcing and effect of the Yangtze River, may influence the flow pattern of local lake body at certain times, which affects the transport and diffusion processes of sediment, pollutants and nutrient substances. Based on two-dimensional hydrodynamic model, the flow distributions and circulation patterns were simulated under uniform wind conditions. Comparisons were made between cases of no wind and uniform wind in order to investigate the spatiotemporal patterns of the flow. The results showed that, for NE and SSW steady winds at 3.03m/s speed, the impact of wind on water level was negligible, and the effect on flow was mainly restricted to the west coast and eastern bay between the middle of July and the end of September. In the affected regions(about 16% of the total lake area), obvious circulations were noted, which showed spatial and temporal variability, and where average flow velocity was approximately twice as much as that for no wind condition. NE and SSW wind-driven circulations occurred in similar locations but corresponding flow directions were opposite. In comparison to previous hydrodynamic simulations of Lake Poyang that ignored wind effect, this study enhanced the understanding of the location, magnitude and pattern of uniform wind forcing effect on flow. It hints the potential uncertainty in sediment and pollutant transport modelling when dealing with wind conditions. |
| Key words: Hydrodynamic simulation uniform wind wind-driven circulation Lake Poyang |
