| 切变气流中地形强迫激发的非线性长波 |
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| 引用本文： | 蒋后硕,吕克利.切变气流中地形强迫激发的非线性长波[J].高原气象,1998,17(3):231-244. |
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| 作者姓名： | 蒋后硕 吕克利 |
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| 作者单位： | 南京大学大气科学系 |
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| 摘 要： | 经推导得到了包括地形和耗散的ＦＫｄＶ－Ｂｕｒｇｅｒｓ方程，利用数值解讨论了地表强迫激发的弧波演变以及移动性孤波与地形的相互作用，结果显示，对于α〉０或α〈０，不论是在气旋式切变气流还是反气旋式切变气流中，地形都能在强迫激发出定常孤波，在其下游产生调制椭圆余弦波列的背风波，当α＝０时，在反气旋式切变气流中强迫区产生的是大振幅定常孤波，气旋式切变气流中强迫区产生的是复杂的非定常孤波，地形强迫产生的ｍ＝
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| 关 键 词： | 切变气流 地形激发 耗散 局地阻塞 非线性长波 |
THE NONLINEAR LONG-WAVES EXCITED BY TOPOGRAPHY IN A SHEAR FLOW |
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| JIANG Hou-shuo,L Ke-li.THE NONLINEAR LONG-WAVES EXCITED BY TOPOGRAPHY IN A SHEAR FLOW[J].Plateau Meteorology,1998,17(3):231-244. |
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| Authors: | JIANG Hou-shuo L Ke-li |
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| Abstract: | A FKdV-Burgers equation including topography and dissipation is derived and its numerical solutions are given. The numerical results are used to discuss the evolution of the solitary waves excited by topography and the interaction of moving solitary wave with topography. Both the stationary solitary waves with meridional wavenumber m=1 excited by topography in a near-resonant anticyclonic shear flow and the interaction of topography with solitary wave with suitable dissipation and detuning parameters may be important factors for the localized blocking formation. |
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| Keywords: | Shear flow Topography Dissipation Localized blocking |
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