Laserfiche WebLink
<br />14 <br /> <br />modification concepts: at temperatures warmer than about -lOoe. the <br /> <br />~ <br /> <br />concentration of natural ice n~clei is very small. so that ice pha$e <br /> <br />Q <br /> <br />precipitation mechanis~s are inefficient. and large values of liquid <br /> <br />water are observed. <br /> <br />Figure 4 shows the relationship between the liquid water flux data <br />----=-- -~- <br /> <br />and the simultaneous_precipitation rate. as given by averaging the data <br /> <br />""~...---'..;.\ <br /> <br />from the eight project precipitation gauges, there is no apparent <br /> <br />. ~.-- :;It <br /> <br />~ <br /> <br />correlation qf precipitation rate and liquid water flux. <br /> <br />SOlDe storm <br /> <br />C"-- n_:::>.._~_~.,.____~" <br />, <br /> <br />",--.':.::..;c,.,,,,- ' <br /> <br />periods had naturally high precipitation efficiency (values having low <br /> <br />water flux and high precipitation rate). while others were inefficient <br /> <br />(high water flux and low precipitation rate). Generally speaking. the <br /> <br />warmer periods shown in Figure 3 had less eff~cient precipitation <br /> <br />processes. as indicated by relatively large liq~id water flux and small <br /> <br />precipitation rate. <br /> <br />i <br /> <br />If one assumes that the periods when rawinsonde data were not <br /> <br />available for each storm had characteristics similar to the periods when <br /> <br />,r' <br />e 7' -') rawinsonde data were available .an estimate of the total amountr of water <br />'7 ~j; ,~~S~:'lg_ ~ver. the mountai.n duri.ng ':he~..s mo~\,l, projeot Pari.od oan be <br />VV"4>'" <br />'l.O\,v... I ~_~ain~d (excluding the first four storms). The projected total of <br />E ~ e.- e..-~~ liquid passing over the Tushar range if all storms were observed for <br />~ W~ vV\ their duration wa~:!._~6:~r..:,/eet. <br />If weather modification efforts were able to (1) convert this <br /> <br />supercooled water to ice. (2) have 100 percent of this converted water <br /> <br />arrive on the ground as precipitation. and (3) not reduce the amount of <br /> <br />natural ice which would have arrived at the ground witpout modification, <br /> <br />the net effect would be an increase in snow available for r~noffby <br /> <br />about 1'7,000 acr'e feet. These assumptions are unrealistic--it is more <br /> <br />~....,;d"-~"_';_'<-'-' <br /> <br />~'.',,,,,,._.,._.,...,.._.. -~~. .",.11' ""<'-"'~-'~.~,:.'_..'. <br />