Integrated Numerical Modeling of Spatial and Time-Variant Hydrologic Response in Subsurface Drained Watersheds

Field-scale studies showed that the subsurface module could provide good predictions with accurate descriptions of soil hydraulic properties, climatic data and drainage parameters. Simulated results at the field scale also indicated that the subsurface model was highly sensitive to estimates of evapotranspiration during the summer. Hydraulic parameters obtained from calibration studies failed to simulate post-rainfall event recessions. Drain flow simulations that included macropore flow resulted in higher magnitudes of response and better agreement with observed data, compared to simulations that considered sorptive flow alone. Simulations also showed that drain responses were in better agreement with observed flows during low rainfall, as compared to high rainfall. Results from the application of the integrated model to the Upper Little Vermilion River Watershed showed that the integrated modeling framework underestimated stream flows, indicating the importance of contributions from surface runoff and ditch drainage.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Agricultural Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Badiger, Shrinivas M.

Contributors dc:contributor

• Cooke, Richard A.

• Engineering, Agricultural

Language dc:language

eng

Identifier

(MiAaPQ)AAI3017018

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/86041