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2002•Journal of spatial hydrologyRequires access

NPS Assessment Model: An Example of AGNPS Application for Watershed Erosion and Phosphorus Sedimentation

Yongsheng Ma, J. F. Bartholic, Jeremiah Asher, Yi Shi, Da Ouyang

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Abstract

AGNPS, which is an agricultural non-point source pollution model, was used in combination with GIS tools to assess the feasibility of water quality effluent trading for phosphorus, in Morrow Lake sub-watershed, Kalamazoo, MI. GIS software packages (Arc/Info and ArcView) are used to prepare data input for the model and post process the results. The sensitivity of AGNPS parameters was evaluated to determine which most influenced phosphorus sediment loading. Evaluations were conducted to determine whether calculation processes could be simplified for rapid pollution forecasts. The results showed that pollution could be predicted by varying temporary model data (i.e. precipitation etc.) in the AGNPS model. Lastly, parameter sensitivity showed that phosphorus sediment is most sensitive to soil texture while sediment loss is most sensitive to the SCS curve number.

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What this paper is about

AGNPS, which is an agricultural non-point source pollution model, was used in combination with GIS tools to assess the feasibility of water quality effluent trading for phosphorus, in Morrow Lake sub-watershed, Kalamazoo, MI. GIS software packages (Arc/Info and ArcView) are used to prepare data input for the model and post process the results. The sensitivity of AGNPS parameters was evaluated to determine which most influenced phosphorus sediment loading. Evaluations were conducted to determine whether calculation processes could be simplified for rapid pollution forecasts. The results showed that pollution could be predicted by varying temporary model data (i.e. precipitation etc.) in the AGNPS model. Lastly, parameter sensitivity showed that phosphorus sediment is most sensitive to soil texture while sediment loss is most sensitive to the SCS curve number.

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Available abstract

AGNPS, which is an agricultural non-point source pollution model, was used in combination with GIS tools to assess the feasibility of water quality effluent trading for phosphorus, in Morrow Lake sub-watershed, Kalamazoo, MI. GIS software packages (Arc/Info and ArcView) are used to prepare data input for the model and post process the results. The sensitivity of AGNPS parameters was evaluated to determine which most influenced phosphorus sediment loading. Evaluations were conducted to determine whether calculation processes could be simplified for rapid pollution forecasts. The results showed that pollution could be predicted by varying temporary model data (i.e. precipitation etc.) in the AGNPS model. Lastly, parameter sensitivity showed that phosphorus sediment is most sensitive to soil texture while sediment loss is most sensitive to the SCS curve number.

Key concepts: Watershed, Environmental science, Sediment, Phosphorus, Nonpoint source pollution, Erosion, Hydrology (agriculture), Pollution

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