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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />II. EXPERIMENT AL PLAN <br /> <br />The purpose of the experimental plan is to tie together theory and <br /> <br /> <br />practice to produce a workable engineering program. We desire to arrive at <br /> <br /> <br />a method of evaluation which will permit us to determine the effects of artifi- <br /> <br /> <br />cial nucleation on wintertime orographic storms in a relatively short period- <br /> <br /> <br />say a season or so. This desired compression of experimental time also im- <br /> <br /> <br />plies a compression in tim e as far as the data are concerned, Therefore, <br /> <br /> <br />we are constrained to take rather fine time- scale data and measure as many <br /> <br /> <br />parametric quantitie s as pos sible. Furthermore, the experiment must in- <br /> <br /> <br />volve a data analysis technique that will allow us to pick rather srnall signals <br /> <br /> <br />out of what we must assume is a rather noisy composite and do it within a <br /> <br /> <br />record length which, in a season, may total no more than a few hundred hours. <br /> <br /> <br />The re sult of the se conside rations is that our expe rirnental plan involve 5 the <br /> <br /> <br />following primary elements: <br /> <br />. <br /> <br />measurement of precipitation- rate as the prim ary variable <br /> <br /> <br />the analysis of precipitation- rate data by the powe r spectrum <br /> <br />method <br /> <br /> <br />the measurement of diffusion characteristic s, wind, temperature <br /> <br /> <br />and other meteorological variables for use in stratifying the power <br /> <br /> <br />spectrum re sults <br /> <br /> <br />the measurement of tracer concentration and silver iodide con- <br /> <br />. <br />. <br /> <br />. <br /> <br />centration in snowmelt sample s to confirm the transport charac- <br />teristics of the nuclei from the nucleating site to the target <br />. nucleation in the form of a square wave forcing function having a <br />pe riod of 1 cycle Ihour <br /> <br /> <br />Figure 3 illustrates the elements of the experimental plan. Our con- <br /> <br /> <br />cept of the overall analysis problem is shown in Figure 4. We know what our <br /> <br /> <br />input to the atmosphere is in term s of nucleating elements because we turn <br /> <br /> <br />the generators on and off at prescribed intervals. The other known element <br /> <br /> <br />is precipitation- rate as me asured by ground sensor s throughout the target <br /> <br />- 5 - <br />