| 引用本文: | 张利民,熊谷道夫,濮培民.大气边界层对日本琵琶湖物理过程的影响.湖泊科学,1998,10(1):23-30. DOI:10.18307/1998.0104 |
| Zhang Limin,Michio Kumagai,Pu Peimin.The Influence of Atmospheric Boundary Layer on the Physical Processes of Lake Biwa, Japan. J. Lake Sci.1998,10(1):23-30. DOI:10.18307/1998.0104 |
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| 大气边界层对日本琵琶湖物理过程的影响 |
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张利民1,2, 熊谷道夫1, 濮培民3
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1.琵琵胡研究所, 滋贺县大津市打出滨 1-10, 大津 520, 日本;2.江苏省环境保护局, 南京 210013;3.中国科学院南京地理与湖泊研究所, 南京 210008
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| 摘要: |
| 本文建立了一个大气、水耦合数值模型来研究琵琶湖的环流机制,模拟计算结果表明:1)在潮面上存在一个正的风涡度场以及白天的正散度场.晚上的负散度场.在温度分层的季节里.这一特殊的琵琶潮流域大气边界层可以产生并维持北潮一稳定、强度较弱的气旋式环流;2)当考虑大气边界层的不均匀风场的影响时,潮中形成的环流比均匀风场驱动形戚的环流更加稳定且维持时间更长;3)局地风场可以在湖中驱动形成一典型的水温水平分布,即浅水水温偏高.深水水温偏低的分布. |
| 关键词: 耦合模型 涡旋 水温 琵琶湖 数值模拟 |
| DOI：10.18307/1998.0104 |
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| 基金项目:BITEX'93资助项目 |
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| The Influence of Atmospheric Boundary Layer on the Physical Processes of Lake Biwa, Japan |
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Zhang Limin1,2, Michio Kumagai1, Pu Peimin3
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1.Lake Biwa Research lnstitute, 1-10 Uchidehama, Otsu, Shiga 520, Japan;2.Environmental Protection Bureau Jiansu Province, Nanjing 210013, China;3.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008
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| Abstract: |
| A numerical model coupling atmosphere with hybrodynamics is set up in this paper to study the gyres mechanism m Lake Biwa, Japan. Some results arc obtained as follows:1)There exists a positive wind vorticity field over the lake, and also a positive wind divergence field in daytime and negative one in night This special atmospheric boundary layer of Lake Biwa catchment can generate a typical land-lake breeze, this local wind system can induce and maintain a weak but stable counter-clockwise gyre in north lake during period of thermal stratification. 2)When considering inbomogeneous wind field. the gyres formed in the lake can sustain longer and be more stable than that only driven by homogeous wind over the lake. 3)The local wind system can produce a typical horizontal distribution of water temperature, i.e. water temperature higher in shallow water, lower in deep water. |
| Key words: Coupling model gyres water temperature Lake Biwa numerical simulation |
