Thanks Gary, For some reason the images were not easy to down load.
Image 1. I take they are scub(bers). Image 2. Wright flyer at the Rheims event 1909? On Mon, Jun 9, 2014 at 11:33 PM, Gary Stevenson <[email protected]> wrote: > Hi All, > > Further to my earlier email, here are two images for your consideration. > The first might inspire you to have a look at higher definition images of > T-L ‘s work. > > Re the second image – a painting by Rousseau who was a contemporary of T-L > – what is that strange contraption that is shown in the sky? > > > > Gary > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Gary Stevenson > *Sent:* Monday, 9 June 2014 10:32 PM > *To:* 'Discussion of issues relating to Soaring in Australia.' > *Subject:* Re: [Aus-soaring] Cloud proof fence > > > > Hi Mike, > > Awesome. Very nicely brought together. > > ************************************************************************** > > Loved the bit about the “stunted poor excuses for trees” I immediately > flashed on Henri de Toulouse- Lautrec, one of the masters of the French > Post- Impressionist school of painting who was also a bit that way > (although not a tree). > > ************************************************************************* > > Waffling on, you are no doubt familiar with the “Mallee Scrub” . Unknown > to most of the world, Mallee roots are the finest/ best heat output, wood > fuel known to man. However I can assure you that they are “a bit” gnarly, > and do not split like plantation grown pine. > > > > Gary > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Mike Borgelt > *Sent:* Monday, 9 June 2014 7:29 PM > *To:* Discussion of issues relating to Soaring in Australia. > *Subject:* Re: [Aus-soaring] Cloud proof fence > > > > You need to understand the geography and climate of SW W.A. > > The wheatbelt is the area in the SW where the rainfall is high enough to > grow wheat. Check out any satellite photos of the area. The rabbit proof > fence is the limit of that area pretty much. I had a pal in physics at UWA > in the late 1960s who came from a farm just west of the fence. If they were > lucky they got a crop 2 out of 5 years and then the bastard emus would be > looking hungrily at it from the other side of the fence. > > So the fence location isn't exactly independent of the surface > vegetation/rainfall characteristics. > > The rain is mostly in winter apart from the odd summer thunderstorm and > comes from the showers following passage of cold fronts. Much of the rain > falls on the coastal plain and Darling range (what there is of it - Perth > is built on a coastal desert) and what is left goes to the wheatbelt. > > After the harvest in December the wheatbelt is nearly bone dry. Great > outlanding country - tell me about it. Your biggest problem, if you didn't > figure out where the fences/roads/houses were while still airborne is > figuring out where to walk to after landing. If you fly there in summer > you'll get good at flying in blue thermals except for the odd spectacular > trough day which will have very high based cu and high convection. I've > been to 16500 feet in blue thermals there. Much like South Australia but > without a large river for irrigation fed by the Great Divide. > > The dry ground and only a little bit of dry stubble left means there sure > as heck isn't a lot of evaporation (latent heat flux) as there isn't any > water in the vegetation. In the scrub the stunted poor excuses for trees > will however still evapo-transpire so in summer there will be more latent > heat flux there. In August the rains are still happening in the crop > growing areas with higher rainfall so that's where the latent heat flux is > greater than in the scrub. > > Nothing all that surprising in that paper. > > What isn't obvious is the salinity problem. Lots of salt lakes and salt > coming to the surface as a result of tree clearing. This has been > addressed since the mid 1970s with replanting and other mitigation methods. > > > > Mike > > > > > > > > > > At 06:49 PM 9/06/2014, you wrote: > > Thanks Robert, > > Just to clarify for me. > > "The latent heat flux is the movement of heat energy from the surface to > altitude associated with the evaporation of water at the surface and its > condensation at altitude in clouds." > >  I take it that, Latent heat flux is one of the effects which generates > thermals. The other is sensible heat ie ground gets hot, transfers heat > to near surface air by conduction. Air then rises (convection). > > Do you have any thoughts on why the natural vegetation (we used to call it > scrub) has a strong bias to Latent Heat Flux in December but not in August? > > > On Sun, Jun 8, 2014 at 11:17 AM, Robert Hart <[email protected]> wrote: > > On 08-Jun-14 08:44, Peter Champness wrote: > > That seems right. They should have asked glider pilots. > > I note that the paper shows that the latent heat flux is strongly skewed > to the native vegetation areas in Dec (soaring season). In August it is > the other way, higher over the agricultural areas. > > I assume latent heat flux means avapoeration. > > > > Latent heat is the heat absorbed or released during a phase change (ie > solid/liquid/gas phases). In water, there is very significant latent heat > involved in evaporating water which is then released when the water vapour > recondenses to liquid water (droplets) in clouds. > > The latent heat flux is the movement of heat energy from the surface to > altitude associated with the evaporation of water at the surface and its > condensation at altitude in clouds. > > As flatland glider pilots, we ride this flux in the form of thermals > generated by a number of effects. > > -- > > Note: I am changing my email address - please only use my gmail address > from now on! > > Robert Hart                          > [email protected] > > +61 438 385 533 > > _______________________________________________ > > Aus-soaring mailing list > > [email protected] > > To check or change subscription details, visit: > > http://lists.internode.on.net/mailman/listinfo/aus-soaring > > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring > > *Borgelt Instruments *- > *design & manufacture of quality soaring instrumentation since 1978 * > www.borgeltinstruments.com > tel: 07 4635 5784 overseas: int+61-7-4635 5784 > mob: 042835 5784 : int+61-42835 5784 > P O Box 4607, Toowoomba East, QLD 4350, Australia > > _______________________________________________ > Aus-soaring mailing list > [email protected] > To check or change subscription details, visit: > http://lists.internode.on.net/mailman/listinfo/aus-soaring >
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