ISSN 1002-1027  CN 11-2952/G2

Acta scientiarum naturalium Universitatis Pekinensis

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Numerical Simulations of Mountain Gravity Waves Generated by Multi-Layer Flow over an Isolated Mountain

LI Ziliang1, 2   

  • Received:2005-08-01 Online:2006-05-20 Published:2006-05-20

Abstract: Characteristics of non-linear mountain gravity waves and atmospheric ship waves generated by three-dimensional multi-layer flow over an isolated mountain were investigated using the numerical model, ARPS. Results show that the transverse and diverging modes of atmospheric ship waves generated by two layer flow over an isolated mountain are the same as that of mountain gravity waves in linear models. However, non-linear mountain gravity waves and atmospheric ship waves generated by three-dimensional three-layer flow over an isolated mountain show completely different characteristics from linear mountain gravity waves. In the nonlinear case, due to non-linear interactions there exist two ship waves involving in two diverging modes on the lee side, which propagate downstream. These ship wave modes have more complex wave characteristics compared with that in two layer and linear models.