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University of Guelph (2014)

Examining the water quantity and quality effects of land management practices in a Canadian Prairie Subwatershed using a GIS-Based distributed model

Lung, Ivana

Titre : Examining the water quantity and quality effects of land management practices in a Canadian Prairie Subwatershed using a GIS-Based distributed model

Auteur : Lung, Ivana

Université de soutenance : University of Guelph

Grade : Master of Science (MS) 2014

Résumé
Beneficial management practices (BMPs) were evaluated using the Integrated Modelling for Watershed Evaluation of BMPs (imWEBs) model in southern Manitoba. The hourly model was setup, calibrated (2005-06) and validated (2007-09) for the Steppler subwatershed using nine stream discharge and water quality monitoring station. After calibrating the model, three scenarios were evaluated : forage conversion, conventional tillage and small dams. A daily R2 and E outlet calibration of 0.269 and 0.155, respectively, and outlet validation of 0.108 and 0.077, respectively, was achieved. Sediment load results had a daily RMSE, CV and CORR outlet calibration of 0.607, 0.441 and 0.438, respectively, and validation of 0.392, 1.112 and -0.374, respectively. The evaluation of the three scenarios indicated beneficial reductions. However, the expected benefits were not as high ; thus, suggesting a need to revisit the parameterization for the tillage management and the small dam reservoirs to achieve the correct magnitude reductions from BMP applications.

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