Daytime buoyancy driven upslope flows and the corresponding night-time downslope drainage winds have long been recognized as significant factors in the overall ventilation of the associated valley regions. These flows can serve to transport pollutants out of the valley floor and to transport pollutants into the typically more pristine and often more fragile surrounding slopes. The paper describes the results of a set of experiments conducted to evaluate the structure of such flows on the laboratory scale model along with salient features of the field experiments which gave the impetus to construct a model. Preliminary experiments were conducted to evaluate the dependence of the strength and the depth of the buoyant boundary layer on the ambient stabilty. The strength and depth of the slope flow layer were found to be a weaker function of ambient stability than traditional Prandtl type models would suggest.
|State||Published - 1986|