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Technical Note: Alternative in-stream denitrification equation for the INCA-N model
Technical Note: Alternative in-stream denitrification equation for the INCA-N model
The Integrated Catchment model for Nitrogen (INCA-N) is a semi-distributed, process based model that has been used to model the impacts of land use, climate, and land management changes on hydrology and nitrogen loading. An observed problem with the INCA-N model is reproducing low nitrate–nitrogen concentrations during the summer growing season in some catchments. In this study, the current equation used to simulate the rate of in-stream denitrification was replaced with an alternate equation that uses a mass transfer coefficient and the stream bottom area. The results of simulating in-stream denitrification using the two different methods were compared for a one year simulation period of the Yläneenjoki catchment in Finland. The alternate equation (Nash–Sutcliffe efficiency = 0.61) simulated concentrations during the periods of the growing season with the lowest flow that were closer to the observed concentrations than the current equation (Nash–Sutcliffe efficiency = 0.60), but the results were mixed during other portions of the year. The results of the calibration and validation of the model using the two equations show that the alternate equation will simulate lower nitrate–nitrogen concentrations during the growing season when compared to the current equation, but promote investigation into other errors in the model that may be causing inaccuracies in the modeled concentrations.
- North Carolina Agricultural and Technical State University United States
- South Carolina State University United States
- Finnish Environmental Institute Finland
- Finnish Environment Institute Finland
- North Carolina State University United States
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Birgand, F., Skaggs, R. W., Chescheir, G. M., and Gilliam, J. W.: Nitrogen removal in streams of agricultural catchments - A literature review, Crit. Rev. Environ. Sci. Tech., 37, 381-487, 2007.
Etheridge, J. R., Lepistö, A., Granlund, K., Rankinen, K., Birgand, F., and Burchell, M. R.: Reducing uncertainty in the calibration and validation of the INCA-N model by using soft data, Hydrol. Res., 45, 73-88, 2014.
Granlund, K., Rankinen, K., and Lepistö, A.: Testing the INCA model in a small agricultural catchment in southern Finland, Hydrol. Earth Syst. Sci., 8, 717-728, doi:10.5194/hess-8-717-2004, 2004. [OpenAIRE]
Jarvie, H. P., Wade, A. J., Butterfield, D., Whitehead, P. G., Tindall, C. I., Virtue, W. A., Dryburgh, W., and McGraw, A.: Modelling nitrogen dynamics and distributions in the River Tweed, Scotland: an application of the INCA model, Hydrol. Earth Syst. Sci., 6, 433-454, doi:10.5194/hess-6-433-2002, 2002. [OpenAIRE]
Lepistö, A., Granlund, K., Kortelainen, P., and Räike, A.: Nitrogen in river basins: Sources, retention in the surface waters and peatlands, and fluxes to estuaries in Finland, Sci. Total. Environ., 365, 238-259, 2006. [OpenAIRE]
Lepistö, A., Huttula, T., Bärlund, I., Granlund, K., Härmä, P., Kallio, K., Kiirikki, M., Kirkkala, T., Koponen, S., Koskiaho, J., Kotamäki, N., Lindfors, A., Malve, O., Pyhälahti, T., Tattari, S., and Törmä, M.: New measurement technology, modelling and remote sensing in the Säkylän Pyhäjärvi area - Catchlake, Reports of Finnish Environment Institute, Helsinki, Finland, 15, 2008. [OpenAIRE]
Nash, J. E. and Sutcliffe, J. V.: River flow forecasting through conceptual models part I - a discussion of principles, J. Hydrol., 10, 282-290, 1970.
O'Shea, L. and Wade, A. J.: Controlling nitrate pollution: An integrated approach, Land Use Policy, 26, 799-808, 2009.
Rankinen, K., Karvonen, T., and Butterfield, D.: An application of the GLUE methodology for estimating the parameters of the INCA-N model, Sci. Total Environ., 365, 123-139, 2006. [OpenAIRE]
Rankinen, K., Granlund, K., Futter, M. N., Butterfield, D., Wade, A. J., Skeffington, R., Arvola, L., Veijalainen, N., Huttunen, I., and Lepistö, A.: Controls on inorganic nitrogen leaching from Finnish catchments assessed using a sensitivity and uncertainty analysis of the INCA-N model, Boreal Environ. Res., 18, 373- 386, 2013. [OpenAIRE]
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Popularity provided by BIP!- National Science Foundation (NSF)
- 0750733
- Directorate for Education & Human Resources | Division of Graduate Education
- North Carolina Agricultural and Technical State University United States
- South Carolina State University United States
- Finnish Environmental Institute Finland
- Finnish Environment Institute Finland
- North Carolina State University United States
The Integrated Catchment model for Nitrogen (INCA-N) is a semi-distributed, process based model that has been used to model the impacts of land use, climate, and land management changes on hydrology and nitrogen loading. An observed problem with the INCA-N model is reproducing low nitrate–nitrogen concentrations during the summer growing season in some catchments. In this study, the current equation used to simulate the rate of in-stream denitrification was replaced with an alternate equation that uses a mass transfer coefficient and the stream bottom area. The results of simulating in-stream denitrification using the two different methods were compared for a one year simulation period of the Yläneenjoki catchment in Finland. The alternate equation (Nash–Sutcliffe efficiency = 0.61) simulated concentrations during the periods of the growing season with the lowest flow that were closer to the observed concentrations than the current equation (Nash–Sutcliffe efficiency = 0.60), but the results were mixed during other portions of the year. The results of the calibration and validation of the model using the two equations show that the alternate equation will simulate lower nitrate–nitrogen concentrations during the growing season when compared to the current equation, but promote investigation into other errors in the model that may be causing inaccuracies in the modeled concentrations.