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Extra info for 100-Area Monthly Reports [for 1947] [declassified]
4) at the altitude of each vertical wind stratum. Typical 28 and i/L values arc given by Golder. 2 9 values of z are givwi by Pasquill, 3 J 36 For many predictions it is sufficient to let the code set the parameters in eq. 4). 5) DEPOSIT INCREMENT DESCRIPTION As already noted, the base and top of each fallout parcel are inde- pendently transported from their position in the stabilized cloud to ground impact. Once impacted, the,. -ecombined to define a deposit increment of fallout distributed over the ;iipact plane by a bivariate Gaussian function.
DISCUSSION The Initialization and Cloud Rise Module passes on to the Diffusive Transport Module (DTM) fallout parcel descriptions as discussed at the end of the preceeding section, plus vertical profiles of atmospheric pressure, temperature, humidity, density and viscosity. Wind data are supplied to the DTM as either: a single vertical profile, a sequence of single vertical profiles used to update the windfield and/or multiple profiles to account for variation of wind with geographic location. If the latter option is chosen, the user must also specify a three-dimensional grid which spans the atmospheric transport space along with paranmeters used for wind field interpolation, and vertical as well as horizontal wind components are considered.
3) also can be written U,3 k(z+Z) (334) ' where u, is surface layer friction velocity given by k u/ u, [zn(s/zo) + Pm] Here us is surface wind speed measured at height s (usually s = 10 meters), and Pm has the following empirical functional forms 27 of height and MoninObukhov Length, L: a. stable conditions = b. neutral conditions 0 ; L= *m c. 7 s/L ; L > 0 unstable conditions 'P = " £n[(ý2 + I)(C + 1)2/8] + 2 tan-I = (1 - 15 s/L)1/4; L < () - 2 0. The user can input to DELFIC values for us, s, z0 and I/L, and the code computes e via eq.