## Abstract

An equation is derived for the components of the horizontal (turbulent) frictional force in the sigma -coordinate system with special attention to mesometeorological flow models. The starting point is the horizontal equation of motion in its 'flux-form' in the sigma -system in which we replace (following Reynolds' procedure) the velocity components u,v and sigma as well as other relevant quantities by terms of the form u equals U OVER BAR plus plus U**1,. . . , sigma equals sigma OVER BAR plus sigma **1 etc. (U OVER BAR equals time average of u; U**1) equals fluctuating part of u. ) Next, the equation is averaged with respect to time and terms which we believe are small in mesometeorological flows, are neglected. On expressing sigma **1 by an appropriate expression that involves w**1, the result shows the appearance of two new terms which have not been considered previously in the published literature.

Original language | English |
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Title of host publication | Boundary Layer Structure |

Editors | Hadassah Kaplan, Nathan Dinar |

Publisher | D. Reidel Publ Co |

Pages | 293-312 |

Number of pages | 20 |

ISBN (Electronic) | 978-94-009-6514-0 |

ISBN (Print) | 9027718776 |

DOIs | |

State | Published - 1984 |