Abstract
ABSTRACT SOME chemical pollutants are adsorbed to soil parti-cles and transported with the sediment load. Sediments contain a mixture of particles of varying sizes and densities that have differing transport characteristics and affinities for chemical pollutants. In addition, ma-nure particles are detached and transported by erosion processes during runoff events. A mathematical model is presented that describes the transport of various sedi-ment particle types during unsteady overland-flow from manured areas. The present version of the model con-siders transport of four discrete particle fractions tine primary, coarse primary, soil-aggregate, and ma-nure particles. Sediment originates from two sources interrill areas and rill areas. Two manure application modes, surface-applied or soil-incorporated, are recognized. The model operates with existing watershed hydrologic models and can be useful in studies of nonpoint source pollution from land areas receiving animal wastes.
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