Resistance law, effective roughness length, and deviation angle over hilly terrain

Springer Science and Business Media LLC - Tập 55 - Trang 191-198 - 1991
S. Emeis1, S. S. Zilitinkevich1
1Institut für Meteorologie und Klimaforschung, Kernforschungszentrum Karlsruhe/Universität Karlsruhe, Karlsruhe, Germany

Tóm tắt

In this note, we derive from the resistance law of Rossby number similarity theory the expressions for the drag coefficient and the deviation angle for strongly unstable and strongly stable stratifications. The extension of the applicability of the resistance laws to inhomogeneous terrain is discussed. A determination of the deviation angle over inhomogeneous terrain from a numerical experiment is presented.

Tài liệu tham khảo

Emeis, S.: 1990a, ‘Pressure Drag of Obstacles in the Atmospheric Boundary Layer’, J. Appl. Meteorol. 29, 461–476. Emeis, S.: 1990b, ‘Surface Pressure Distribution and Pressure Drag on Mountains’, Meteorol. Atmos. Phys. 43, 173–185. Klemp, J. B. and D. K. Lilly: 1980, ‘Mountain Waves and Momentum Flux’, GARP Publ. Ser. 23, 115–141. WMO Geneva. Nappo, C. J.: 1977, ‘Mesoscale Flow over Complex Terrain During the Eastern Tennessee Trajectory Experiment (ETTEX)’, J. Appl. Meteorol. 16, 1186–1196. Zilitinkevich, S. S.: 1975, ‘Resistance Laws and Prediction Equations for the Depth of the Planetary Boundary Layer’, J. Atm. Sci. 32, 741–752. Zilitinkevich, S. S.: 1989, ‘Velocity Profiles, the Resistance Law and the Dissipation Rate of the Mean Flow Kinetic Energy in a Neutrally and Stably Stratified Planetary Boundary Layer’, Boundary-Layer Meteorol. 46, 367–387.