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Hydrologic Modelling of an Agricultural Drained Micro-Watershed: Performance Analysis of Coupled Surface Water/Groundwater Models

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  9th International Drainage Symposium held jointly with CIGR and CSBE/SCGAB Proceedings, 13-16 June 2010  IDS-CSBE-100258.(doi:10.13031/2013.32176)
Authors:   Mushombe Muma, Alain N Rousseau, Claudio Paniconi, Éric Van Bochove, Michel Nolin, Wanhong Yang, F Branger
Keywords:   Subsurface drainage, Physical modelling, Coupled hydrologic model, Cathy, Drainmod, Pestdrain

The objective of this study is to quantitatively assess the impact of subsurface drainage and soil properties on the hydrological behaviour of a headwater micro-watershed located in the Bras dHenri watershed, Quebec (Canada). The studied 2.4-km micro-watershed is characterized by intensive livestock production supported by forages and annual crops such as corn grain or soybeans. It is one of Agriculture and Agri-Food Canadas WEBs watersheds (Water Evaluation of Beneficial management practices). Hydrometeorological monitoring has shown that soil properties and subsurface drainage could negatively affect the expected behaviour of beneficial management practices at the watershed scale. Therefore there is a need to understand the influence of these properties on hydrology and one way to study this problem is to set up a physically-based hydrological modelling investigation. Specifically, this project focuses on evaluating the ability of two or three coupled hydrological models (surface flow/subsurface flow) to simulate flows at the micro-watershed outlet and water table depth fluctuations while quantifying the surface and subsurface contributions to flows. The models under consideration are: CATHY (Camporese et al., 2010), DRAINMOD (Skaggs, 1978) and PESTDRAIN (Branger et al. 2009).

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