A Vadose Zone Field Study: Subsurface Tile Drainage, Hydrology, and Variablity
Harbourt, Christopher Mark
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https://hdl.handle.net/2142/86049
Description
Title
A Vadose Zone Field Study: Subsurface Tile Drainage, Hydrology, and Variablity
Author(s)
Harbourt, Christopher Mark
Issue Date
2002
Doctoral Committee Chair(s)
Michael C. Hirschi
Department of Study
Agricultural Engineering
Discipline
Agricultural Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Agricultural
Language
eng
Abstract
Results include an analysis of the water balance components over periods bounded with similar satiated moisture storage conditions. The field site was found to have an excess storage during most periods which is partially explained by the atmospheric ET models underpredicting evaporation during energy limiting periods. A winter flow period was marked with a large loss of water to tile flow possibly the result of off site regional groundwater contributions. The piezometer analysis showed the difference in water table behavior between undrained and drained conditions. Cluster analysis showed more variability for the drained than the undrained condition, and the water table fell more rapidly after a rainfall event for the drained condition. Piezometer measurements and tile flow were found to be highly correlated despite the tile flow variability between the replicate plots. The results of the tracer experiments showed that tracer was not recovered at detectible levels. This indicated that for this soil and variable natural rainfall, higher concentrations of tracer need to be applied to find the tracers in a diffuse tile flow effluent.
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