The structure of katabatic flows down a simple slope

摘要: An analysis of the katabatic flow structure is presented, based on data collected along a simple slope over two-month period. Four meteorological stations were deployed nearly two-dimensional east Mt. Hymettos in Greece. The study focuses momentum and energy budgets flows during carefully selected stationary periods with negligible ambient winds. In order to achieve proper selection, mean features observed are presented their response external profiles successfully compared theoretical Prandtl profiles. Bulk quantities layer proposed experimental values check representativity flows. These comparisons offer further test considerations assist discussions processes affecting mean-flow features. The ∼ 20 m deep, velocities 1-2 s−1. During steady-state acceleration was mainly balanced by surface friction, contribution advective terms being small. estimated interfacial drag less important than drag, which proved large usually suggested values. Within uncertainties, coefficient 10−2 seem appropriate. balance showed that downslope advection turbulent heat flux ground surface.