); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi Bruce:
All the papers are for depths on the order of a few feet, aimed at plant growth, nevertheless in all cases the temperature was changing by at least 1 deg c at the deepest depth recorded. I've heard there is some depth that building foundations need to be so they don't get winter frost heave that might be on the order of a couple of feet, but that's far different from an constant temperature depth. I'm guessing that 10 or 15 feet may be required to get fractional degree temp stability where I am. The Wisconsin data was in loam which I think means a fairly good insulator. They had the widest temperature variation (15 c delta @ 120 cm down). I've got sand and clay after the first foot or so which may be a better thermal conductor implying less variation. Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam Bruce Griffiths wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > Brooke Clarke wrote: > >>Hi Bruce: >> >>Details on your experiment please. >>Hole/pipe diameter, material? >>Depth? >>Delta T at different depths vs surface ambient? >>Soil type? >> >> >>Have Fun, >> >>Brooke Clarke >> > > Brooke > > Unable as yet to find my data, it was published in some very obscure > publication if I remember correctly. > However there was extensive series of records kept in England from the > time of Lord Kelvin. > > More recent data is available from the US forest service among others: > http://ncrs.fs.fed.us/pubs/rn/rn_nc032.pdf > Above is for Wisconsin, not directly applicable to California. > http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?letter=.&classic=YES&bibcode=1952AuSRA...5..303W&page=&type=SCREEN_VIEW&data_type=PDF_HIGH&send=GET&filetype=.pdf > <http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?letter=.&classic=YES&bibcode=1952AuSRA...5..303W&page=&type=SCREEN_VIEW&data_type=PDF_HIGH&send=GET&filetype=.pdf> > Above paper by CSIRO is for an Australian site. > Analysis is fairly comprehensive. > > http://www.mmm.ucar.edu/mm5/lsm/soil.pdf > > http://www.ias.ac.in/epsci/mar2002/Esb1439.pdf > > Bruce > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
