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Isard, Scott A. Kirsch, Scott Wood 2011-05-07T13:47:10Z 2011-05-07T13:47:10Z 10000-01-01 1989 A soil based measure of evapotranspiration was field tested in the growing seasons of 1987 and 1988. This method relies on: (1) tracking the plane of zero flux (PZF) in a soil profile over time and (2) quantification of the change in moisture content, above the PZF, in the soil profile over time. This approach effectively eliminates one of the major drawbacks of the traditional water balance, namely the problem of drainage out of or upward flow into the zone of interest in the soil which can result in serious overestimation or underestimation of evapotranspiration. The only instrumentation necessary to implement this procedure are tensiometers, a neutron probe (or some other means of quantifying the moisture content at depth in a non-destructive manner) and a hand-operated gravimetric sampler. This method was found to perform satisfactorily for periods as short as 6 days. An extensive error analysis pertaining to this method is presented as are suggestions for improving the performance of the soil based measure of evapotranspiration. Made available in DSpace on 2011-05-07T13:47:10Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9010920.pdf: 3061069 bytes, checksum: 5a154ba8a4f9bda5ad1490e408fa4d68 (MD5) Previous issue date: 1989 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:59:08Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:27:52-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9010920 (UMI)AAI9010920 http://hdl.handle.net/2142/22660 eng Copyright 1989 Kirsch, Scott Wood Agriculture, Agronomy Physical Geography Hydrology A soil-based measure of evapotranspiration text Geography Geography University of Illinois at Urbana-Champaign Dissertation Ph.D.