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NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za with the body of the message containing the line: unsubscribe sowacs Pedro, You should look at Knowlton, R., J. Onsurez, S. Bayliss, and W. Strong. 1994. "Environmental Applications of TDR at Sandia National Labs." Proceedings of the Symposium on Time Domain Reflectometry in Environmental, Infrastructure, and Mining Applications, Evanston, Illinois, Sept 7-9, U.S. Bureau of Mines, Special Publication SP 19-94, NTIS PB95-105789, pp. 183-192. They discuss the use of TDR probes of different lengths to obtain wetting front advance. As the wetting front advances down from the surface, it is possible to monitor the changing depths of the wet zone, transition zone, and dry zone. Sincerely, Kevin O'Connor At 06:13 PM 3/7/00 GMT, you wrote: >NOTE: To get off this list, send email to majordomo@aqua.ccwr.ac.za >with the body of the message containing the line: >unsubscribe sowacs > >Pedro Flombaum writes > >Hi! > >I mesured with a TDR 2 lenght profundities (10 and 25 cm) to establish >the soil moisture volumetric constant. What I want to know if I can >somehow substrat the short value to the long one, so I could have an >idea of what is happenig at the lowest portion of the soil. > >If I not wrong the TDR integrate the moisture over the wave guide, so >the substrat must be relative to the length of the guide. I suppose >that the equation should be something like: > > Lab*Oab - La*Oa > ------------------ = Ob > Lb > >Where La is the shortest lenght, Lab is the longest and Lb is the >diference betwen them. Oa is the volumetric moisture constant from >the shortest wave guide, Oab is the volumestric constant from the >longest wave guide and Ob is the volumetric constant I am serching >for. > >Perhaps you could contact me with someone working in this subjet or >recomend me a paper, > >I would really apreciate your information, > >Thanks in advance, > >Lic. Pedro Flombaum > > > > > ++++++++++++++++++++++++++++++++++++++++++++++++++ Kevin O'Connor, Ph.D. (612) 431-3415 voice GeoTDR, Inc. (612) 892-0241 fax 297 Pinewood Drive kevin@geotdr.com Apple Valley, MN 55124 http://www.geotdr.com +++++++++++++++++++++++++++++++++++++++++++++++++