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Including source-specific phosphorus mobility in a nonpoint source pollution model for agricultural watersheds
- Source :
- Journal of Environmental Engineering. Jan, 2009, Vol. 135 Issue 1, p25, 11 p.
- Publication Year :
- 2009
-
Abstract
- Most widely used nonpoint source models associate pollutant loads almost exclusively with land use via pollutant export coefficients and some kind of runoff coefficient. Not surprisingly, the range of management options suggested by such models' simulations are largely linked to changes in land use. This problem is addressed by developing models of dissolved phosphorus (DP) mobility for specific agricultural sources: manure, fertilizers, soil/plant complexes, and impervious surfaces and those associated with baseflow P loads. These models are coupled with a spatially distributed hydrologic model, the variable source loading function model. The model was applied to a small (164 ha), upstate New York watershed and tested against 1996-2000 stream flow and DP data. The source-specific model required no direct calibration of parameters compared to eight parameters needed in a similar export coefficient type model. Both models predicted stream DP loads well but the source-specific model provided additional insights into, for example, how much DP in the stream was derived from accumulated soil P as opposed to direct leaching from manure. This type of information is necessary to develop and assess a full range of options for best management practices, especially those that involve nonstatic activities such as manure spreading. DOI: 10.1061/(ASCE)0733-9372(2009) 135:1 (25) CE Database subject headings: Phosphorus; Watersheds; Agriculture; Water pollution; Nonpoint pollution.
- Subjects :
- Runoff -- Evaluation
Pollutants -- Control
Water pollution -- United States
Water pollution -- Causes of
Non-point source pollution -- Models
Phosphorus -- Environmental aspects
Phosphorus -- Properties
Watershed management -- Research
Engineering and manufacturing industries
Environmental issues
Subjects
Details
- Language :
- English
- ISSN :
- 07339372
- Volume :
- 135
- Issue :
- 1
- Database :
- Gale General OneFile
- Journal :
- Journal of Environmental Engineering
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.191855316