OROGRAPHIC DEFORMATION OF WIND FLOW.
Final rept., 1 May 62-30 Sep 63,
WASHINGTON UNIV SEATTLE
Pagination or Media Count:
As an initial step in the study of fallout over mountainous terrain, a ridge station was instrumented in the Ipsut Pass area of Mount Rainier National Park, Washington. Here tracer particles of zinc sulfide were released and collected during periods of weak and medium strength winds. The chemical used is fluorescent and numbers may be counted by microscopic examination, but a faster and more accurate method was to bombard samples with alpha-rays and count the resulting scintillations. The wind field was studied by means of pibals and double theodolite techniques. In addition to studies made in the field, a numerical experiment to determine the field of concentration from a point or line source, was also undertaken. A large scale, two-dimensional study over a mountain range, along with smaller scale, threedimensional lee side studies, was made. The basic diffusion equation was used to describe the mechanisms of advection and diffusion additional terms were then included to account for gravitational settling and washout by rain. Author