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Development of DRAIN-WARMF model to simulate flow and nitrogen transport in a tile-drained agricultural watershed in Eastern Canada

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  • Dayyani, Shadi
  • Prasher, Shiv O.
  • Madani, Ali
  • Madramootoo, Chandra A.

Abstract

A new watershed model, DRAIN-WARMF, was developed to simulate the hydrologic processes and the nitrogen fate and transport that occur in small, predominantly subsurface-drained, agricultural watersheds that experience periodic freezing and thawing conditions. In this modeling approach, surface flow is simulated using a watershed scale model, WARMF, and subsurface flow is estimated using a field-scale model for subsurface-drained shallow water table fields, DRAINMOD 5.1. For subsurface flow calculations, the watershed is subdivided into uniform cells, and DRAINMOD is run on each cell with inputs based on the individual hydrologic characteristics of the cell. The coupling results in a distributed parameter model that calculates the total flow at the outlet of a watershed as well as the nitrogen losses. The model was evaluated for the St. Esprit watershed, located approximately 50Â km northeast of Montreal. Simulations were carried out from 1994 to 1996; data from 1994 and 1995 was used for model calibration and data from 1996 was used for model validation. The new model was able to adequately simulate the hydrologic response and nitrate losses at the outlet of the watershed. Comparing the observed daily flow/monthly nitrogen with the model's outputs over the validation period returned an R2 value of 0.74/0.86 and modeling efficiency of 0.72/0.83. This clearly demonstrates the model's ability to simulate hydrology and nitrogen losses occurring in small agricultural watersheds in cold climates.

Suggested Citation

  • Dayyani, Shadi & Prasher, Shiv O. & Madani, Ali & Madramootoo, Chandra A., 2010. "Development of DRAIN-WARMF model to simulate flow and nitrogen transport in a tile-drained agricultural watershed in Eastern Canada," Agricultural Water Management, Elsevier, vol. 98(1), pages 55-68, December.
    • Handle: RePEc:eee:agiwat:v:98:y:2010:i:1:p:55-68
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    References listed on IDEAS

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    1. Helwig, Trevor G. & Madramootoo, Chandra A. & Dodds, Georges T., 2002. "Modelling nitrate losses in drainage water using DRAINMOD 5.0," Agricultural Water Management, Elsevier, vol. 56(2), pages 153-168, July.
    2. Yang, Chun-Chieh & Prasher, Shiv O. & Wang, Shaoli & Kim, Seung Hyun & Tan, Chin S. & Drury, Craig & Patel, Ramanbhai M., 2007. "Simulation of nitrate-N movement in southern Ontario, Canada with DRAINMOD-N," Agricultural Water Management, Elsevier, vol. 87(3), pages 299-306, February.
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