Field Evaluation of DRAINMOD 5.1 Under a Cold Climate: Simulation of Daily Midspan Water Table Depths and Drain Outflows1 |
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| Authors: | Shadi Dayyani Chandra A. Madramootoo Peter Enright Guillaume Simard Apurva Gullamudi Shiv O. Prasher Ali Madani |
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| Affiliation: | 1. Respectively PhD Candidate, Graduate Student (M.Sc.), and James McGill Professor (Dayyani, Simard, Prasher), Department of Bioresource Engineering, McGill University, Macdonald Campus, Sainte Anne‐de‐Bellevue, Canada;2. James McGill Professor and Dean, Faculty of Agricultural and Environmental Sciences (Madramootoo), McGill University, Macdonald Campus, Sainte Anne‐de‐Bellevue, Canada;3. Director, Farm Management and Technology Program, Faculty of Agricultural and Environmental Sciences (Enright), McGill University, Macdonald Campus, Sainte Anne‐de‐Bellevue, Canada;4. Professional Associate (Gullamudi), Brace Centre for Water Resources Management, Sainte Anne‐de‐Bellevue, Canada;5. Professor (Madani), Department of Engineering, Nova Scotia Agricultural College, Truro, Nova Scotia, Canada |
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| Abstract: | Abstract: The hydrologic performance of DRAINMOD 5.1 was assessed for the southern Quebec region considering freezing/thawing conditions. A tile drained agricultural field in the Pike River watershed was instrumented to measure tile drainage volumes. The model was calibrated using water table depth and subsurface flow data over a two‐year period, while another two‐year dataset served to validate the model. DRAINMOD 5.1 accurately simulated the timing and magnitude of subsurface drainage events. The model also simulated the pattern of water table fluctuations with a good degree of accuracy. The R2 between the observed and simulated daily WTD for calibration was >0.78, and that for validation was 0.93. The corresponding coefficients of efficiency (E) were >0.74 and 0.31. The R2 and E values for calibration/validation of subsurface flow were 0.73/0.48 and 0.72/0.40, respectively. DRAINMOD simulated monthly subsurface flow quite accurately (E > 0.82 and R2 > 0.84). The model precisely simulated daily/monthly drain flow over the entire year, including the winter months. Thus DRAINMOD 5.1 performed well in simulating the hydrology of a cold region. |
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| Keywords: | DRAINMOD 5.1 subsurface drainage freezing‐thawing simulation model cold climate |
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