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ARS Home » Southeast Area » Oxford, Mississippi » National Sedimentation Laboratory » Watershed Physical Processes Research » Research » Publications at this Location » Publication #306997
Title: Watershed runoff and sediment transport impacts from management decisions using integrated AnnAGNPS and CCHE1D models

Author
item Bingner, Ronald - Ron
item Kuhnle, Roger
item Wells, Robert - Rob
item MOMM, HENRIQUE - Middle Tennessee State University
item ALTINAKAR, MUSTAFA - University Of Mississippi
item SINGH, JASWANT - University Of Mississippi
item SHEN, DAYONG - University Of Mississippi

Submitted to: International Conference on Hydroscience and Engineering (ICHE)
Publication Type: Proceedings
Publication Acceptance Date: 7/2/2014
Publication Date: 9/28/2014
Citation: Bingner, R.L., Kuhnle, R.A., Wells, R.R., Momm, H.G., Altinakar, M., Singh, J., Shen, D. 2014. Watershed runoff and sediment transport impacts from management decisions using integrated AnnAGNPS and CCHE1D models. International Conference on Hydroscience and Engineering (ICHE). Hamburg, Germany, September 28-October 2, 2014.

Interpretive Summary: Conservation planning tools that considers all sources of erosion, sheet and rill, gully, and channels, is critical to developing an effective watershed management plan that integrates the effect of all practices on the watershed system. A watershed pollutant loading management model was used on a 167 ha mixed-landuse watershed near Oxford, MS. From 1982-1995, over 80% of the total sediment load was estimated from channel sources, while ephemeral gully contributions were minimal as a result of reduced cropland tillage practices. Fine sediment load was estimated nearly the same as observed, while sand sediment load was overestimated nearly twice as much as observed, suggesting the need to apply a model that better describes channel evolution processes where most sand originates. For evaluating large watershed systems, the Agricultural Integrated Management Systems (AIMS) has been developed for use from a web-based browser by watershed managers in quickly evaluating management practice impacts on sediment load.

Technical Abstract: Conservation planning tools that consider all sources of erosion, sheet and rill, gully, and channels, is critical to developing an effective watershed management plan that considers the integrated effect of all practices on the watershed system. The Annualized Agricultural Non-Point Source pollutant loading model (AnnAGNPS) utilizes ephemeral gully evolution capabilities with sheet and rill erosion estimated from the Revised Universal Soil Loss Equation, and channel erosion components to provide an integrated assessment of sediment loads. The model was applied to a 167 ha mixed-landuse watershed near Oxford, MS. From 1982-1995, over 80% of the total sediment load was estimated from channel sources, while ephemeral gully contributions were minimal (0.7%) as a result of reduced cropland tillage practices. Fine sediment load was estimated nearly the same as observed. Sediment load from sand was overestimated nearly twice as much by AnnAGNPS, suggesting the need to apply a model, such as the National Center for Computational Hydroscience and Engineering 1-Dimensional model hydrodynamic model (CCHE1D), that describes channel evolution processes. For evaluating large watershed systems, the Agricultural Integrated Management Systems (AIMS) has been developed through the use of a web-based browser for use by watershed managers in evaluating management practice impacts on sediment load.