WMOD00406

• Contract/Permit #: 7-07-83-V0001
• Title: Turbulant Diffusion Studies of Winter Storms Over the Sierra Nevada Mountains
• Date: 12/1/1981
• Weather Modification - Doc Type: Report

4.2

4.3

5. I

a.2

a.3

a.4

a.5

5.6

The comparison between the LTD model and the observed

plume sizes is valid for diffusion time longer than the

critical time (tc). The critical time is determined by

intersection of the size of the most energetic eddies

(A) with the LTD model.

A schematic diagram of the ratio, relative diffusion/
2 2
LTD model, as a function of diffusion time. y, Y ,
2
and a, represent the mean square particle displace-

ments as calculated according to relative diffusion,

Batchelor's E approach, and LTD model, respectively.

Comparison of the spatial spectra of vertical velocity

and temperature, measured from an aircraft and calcul-

sted from tower measurements using the Taylor frozen

turbulence hypothesis (after Monin and Yaglom, 1971b)

Eulerian-space power spectra of longitudinal wind com-

ponent on 23 June 1979. Numbers are average true air-

speed (m/s) at which data were collected.

The same as Fig. a.2, except of vertical wind component.

Eulerian-space power spectra of longitudinal (u') wind

component plotted as kE(k) versus k, on 23 June 1979.

Numbers are averaged true airspeed (m/s) at which data

were co llec ted.

The same as Fig. 5.4, except of lateral (v') wind

component

The same as Fig. 5.4, except of vertical (w') wind

component .

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68

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71

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80

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84

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-I

87

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88

89

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