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Jon, See Wraith, J.M., and D. Or. 1999. Temperature effects on soil bulk dielectric permittivity measured by time domain reflectometry: Experimental evidence and hypothesis development. Water Resour. Res. 35(2):361-369 Or, D., and J.M. Wraith. 1999. Temperature effects on soil bulk dielectric permittivity measured by time domain reflectometry: A physical model. Water Resour. Res. 35(2):371-383 Yu, C., A.W. Warrick, and M.H. Conklin. 1999. Derived functions of time domain reflectometry for soil moisture measurement. Water Resour. Res. 35(6):1789-1796. Yu et al. state that temperature doesn't affect TDR water contents much. Wraith and Or would disagree. -------- Steve Evett srevett@ag.gov http://www.cprl.ars.usda.gov/ USDA-ARS, P.O. Drawer 10, 2300 Experiment Station Road Bushland, Texas 79012. Tel:806.356.5775 FAX:806.356.5750 --------------------------------------------------- In <199906251843.SAA64740@aqua.ccwr.ac.za>, on 06/25/99 at 06:43 PM, owner-sowacs@aqua.ccwr.ac.za said: >Hello, >My name is Jon Southen and I am a graduate student at >the University of Western Ontario. I'm undertaking >research looking at water transport due to temperature >gradients beneath landfills. As part of this >research, I will be doing some column tests on silty >soil subjected to a significant temperature gradient. >I would like to measure soil water content, soil >matric potential (suction) as well as temperature. >Although TDR seems to be the "best" way to measure >water content, I have concerns regarding the >dependence of the dielectric constant of soil on >temperature and density. Since both of these >variables change during the course of my testing, I >need to be able to calibrate moisture content readings >to both of these factors. This approach seems to be >potentially difficult. >Does anyone have any suggestions as to the best way to >approach this problem? Would another method of water >content / matric potential measurement be more >suitable? I need undisturbed measurements at various >times over an approximately one month period. Any >suggestions would be appreciated. >=== >Jon Southen, B.E.Sc. >Graduate Student, >Department of Civil Engineering >University of Western Ontario >jmsouthe@julian.uwo.ca >PHONE : (519) 661-2111 ext. 8291 >FAX : (519) 661-3942 >_________________________________________________________ >Do You Yahoo!? >Get your free @yahoo.com address at http://mail.yahoo.com