By William F. Ritter, Adel Shirmohammadi
Content material: Hydrology / Mary Leigh Wolfe -- Soil erosion and sedimentation / Mark A. Nearing, L. Darrell Norton, and Xunchang Zhang -- Nitrogen and water caliber / William F. Ritter and Lars Bergstrom -- Phosphorus and water caliber affects / Kenneth L. Campbell and Dwayne R. Edwards -- insecticides and water caliber affects / William F. Ritter -- Nonpoint resource pollutants and cattle manure administration / William F. Ritter -- Irrigated agriculture and water caliber affects / Blaine R. Hanson and Thomas J. Trout -- Agricultural drainage and water caliber / William F. Ritter and Adel Shirmohammadi -- Water caliber versions / Adel Shirmohammadi ... [et al.] -- top administration practices for nonpoint resource pollutants regulate / Saied Mostaghimi ... [et al.] -- tracking / William L. Magette
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Extra info for Agricultural nonpoint source pollution : watershed management and hydrology
It combines processes of detachment, transport, and deposition to describe empirically the delivery of sediment from interrill areas to (presumably) a small concentrated flow area (an incised or nonincised rill) where it might be transported downslope. Rose’s equation, on the other hand, was intended to describe only the process of detachment by splash. Deposition in Rose’s32 model was described in a separate term essentially as a product of sediment © 2001 by CRC Press LLC concentration times settling velocity.
If the clay fraction is assumed to be the only adsorbents, the enrichment ratio can be calculated © 2001 by CRC Press LLC as the ratio of clay fraction in sediment to that in matrix soil. Note the enrichment ratio is calculated based on the total clay rather than dispersed clay fraction. 14 Primarily, it is the clay fraction that is transported as primary clay particles, which poses the potential problem for downstream water body chemical contamination. 45–47 However, silt- and clay-sized particles may be enriched during any phase of the erosion process (detachment, transport, and deposition).
15), Dr [kg/(m s)] is net rill erosion rate per unit area of rill bottom, and 2 Di [kg/(m s)] is interrill sediment delivery to the rill (as with rill erosion, expressed on a per unit rill area basis), which was discussed above. 16. For the case of net detachment in a rill, the Dr term will be positive, indicating a net increase in sediment load with downslope distance. For the case of deposition, the Dr term is negative. In the WEPP model, the sediment continuity equation is applied within the rills, which are described hydraulically as small rectangular channels.
Agricultural nonpoint source pollution : watershed management and hydrology by William F. Ritter, Adel Shirmohammadi