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A transfer function model for prediction of solute transport in surface irrigated fields. Research technical completion report, 684K823 Item Info

An experiment was conducted during the summer of 1991 to validate the simple Transfer Function Model (TFM) under variable conditions observed in a 0.9 ha furrow irrigated fallow field. Twenty-one spatially distributed sampling stations were established to monitor movement of bromide (Br). Each station consisted of soil solution samplers at 0.3 m and 0.9 m depth, and a neutron probe access tube to a depth of 2.1 m. A narrow pulse of Br tracer was applied by injection through a sprinkle irrigation system. The tracer was subsequently transported downwards by 3 furrow irrigation events, approximately 3 weeks apart. Soil samples were taken to a depth of 2.4 m prior to each irrigation and at the end of the 63-day study period. The Br concentration data were normalized at each station, and the field-averaged BR profiles were determined for each soil sampling date. Methods based on Darcy velocity and piston flow under-predicted the final Br position. The simple TFM calibration functions were successfully developed based on both soil sample and solution sampler data. The simple TFM calibrated based on soil samples predicted the Br position and general Br profile with reasonable accuracy. The simple TFM predicted a slower movement of the solute front when the calibration function based on 0.3 m solution sampler data was used. The delayed response was attributed to lack of direct contact to soil macropores. Considering the variability and sources of error in a study such as this, use of TFM based on soil sampling is a promising approach for field-scale prediction of solute movement.

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Title:
A transfer function model for prediction of solute transport in surface irrigated fields. Research technical completion report, 684K823
Authors:
Izadi, Behzad; King, Bradley; McCann, Ian
Date Created (ISO Standard):
1992-05
Description:
An experiment was conducted during the summer of 1991 to validate the simple Transfer Function Model (TFM) under variable conditions observed in a 0.9 ha furrow irrigated fallow field. Twenty-one spatially distributed sampling stations were established to monitor movement of bromide (Br). Each station consisted of soil solution samplers at 0.3 m and 0.9 m depth, and a neutron probe access tube to a depth of 2.1 m. A narrow pulse of Br tracer was applied by injection through a sprinkle irrigation system. The tracer was subsequently transported downwards by 3 furrow irrigation events, approximately 3 weeks apart. Soil samples were taken to a depth of 2.4 m prior to each irrigation and at the end of the 63-day study period. The Br concentration data were normalized at each station, and the field-averaged BR profiles were determined for each soil sampling date. Methods based on Darcy velocity and piston flow under-predicted the final Br position. The simple TFM calibration functions were successfully developed based on both soil sample and solution sampler data. The simple TFM calibrated based on soil samples predicted the Br position and general Br profile with reasonable accuracy. The simple TFM predicted a slower movement of the solute front when the calibration function based on 0.3 m solution sampler data was used. The delayed response was attributed to lack of direct contact to soil macropores. Considering the variability and sources of error in a study such as this, use of TFM based on soil sampling is a promising approach for field-scale prediction of solute movement.
Subjects:
Irrigation Model testing Bromides Soil chemistry
IWRRI number:
199213
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
Publisher:
Idaho Water Resources Research Institute; University of Idaho
Contributing Institution:
University of Idaho
Type:
Text
Format:
application/pdf
Cataloger:
KIT
Date Digitized:
2017-09-18

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Preferred Citation:
"A transfer function model for prediction of solute transport in surface irrigated fields. Research technical completion report, 684K823", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-199213.html
Rights
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
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