My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
WMOD00455
CWCB
>
Weather Modification
>
DayForward
>
WMOD00455
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
7/28/2009 2:39:33 PM
Creation date
4/23/2008 11:57:35 AM
Metadata
Fields
Template:
Weather Modification
Contract/Permit #
14-06-D-6842
Title
Research and Development Technique for Estimating Airflow and Diffussion Parameters Related to the Atmospheric Water Resources Program
Date
9/1/1969
Country
United States
Weather Modification - Doc Type
Report
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
111
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />D - 975-1740 meters agI of generator/10 kms of <br />z <br />horizontal transport <br /> <br />with the larger values observed during near-neutral stability <br />events (Table 3-2). These vertical transport values exceeded <br />the natural mean slope of the terrain which is <br /> <br />Valley Slope - 280 meters/10 km . <br /> <br />The lowest value of vertical transport was not observed during <br />the afternoon of greatest stability (December 12, 1970), but for one <br />of the days (December 15, 1970) when considerable snow showers were <br />occurring over the area. Utilization of the silver-iodide by low clouds <br />may have been responsible for the lower transport value since the more <br />unstable stability conditions on December 15 (Fig. 3-3) should have <br />favored a larger vertical transport value. <br />The last two sampling flights confirmed the results from the pre- <br />vious three flights (Ref. 30) in that the valley channels the airflow <br />and seeding material quite strongly along the valley towards the <br />Tennessee Pass area. When the seeding material reaches the higher <br />elevations above the ridge it then spreads out in the horizontal (Figs. <br />3-4, 3-5, 3-6 and 3-7). Unfortunately, the direction and horizontal <br />dispersion of the seeding plume from the generators was not determined <br />very precisely because the aircraft sampling was frequently limited by <br />inclement weather conditions on the mountains next to the valley. <br />The sampling of fluorescent zinc-sulfide and sulfur hexafluoride <br />was not successful. Only traces of the zinc sulfide could be found <br />over the area even at the lowest altitudes (8-9,000 ft msl). It is <br />speculated that very shallow trapped air and surface impaction of this <br />large and cold tracer material may have been partially responsible for <br />these results. <br />The aircraft sampling indicated that the atmospheric dispersion <br />during orographic storm events is, large enough to transport the seeding <br />material from ground generators to orographic cloud systems. Mechanical <br />turbulence enhanced by near-neutral stability conditions and orographic- <br />ally induced eddies are principal physical mechanisms for dispersing <br />the seeding material from the generators. <br /> <br />Laboratory Experimental Program <br />1. Topographic model <br />The topographic model of this study simulated the Eagle <br />River Valley area and topography surrounding Climax, Colorado <br />(Fig. 3-8). The direction of the freestream (or geostropic) <br />wind is approximately 3200 or northwest. The length scale of <br />the model is nondistorted with a scale ratio of 1:9600. Overall <br />dimensions of the model is approximately 25 ft 6 in x 5 ft 10 in. <br />The lowest and reference elevation is 7,800 ft (2379 m) msl and <br />the highest is Mt. Lincoln at 14,284 ft (4350 m) msl. The maximum <br />height difference in the model is 8 in. Further details of the <br />model construction are found in Ref. 30. <br />2. Laboratory simulation facility <br />All the experimental work was conducted in the Colorado <br />State University low-speed recirculating wind tunnel. Specifi- <br />cations of this facility is found in Table 3-3 and a schematic <br />view of the wind tunnel is shown in Fig. 3-9. <br /> <br />'oj <br /> <br />" <br /> <br />30 <br />
The URL can be used to link to this page
Your browser does not support the video tag.