Modeling phosphorus in the environment - Chapter 7 docx
Modeling phosphorus in the environment - Chapter 7 docx
... 170 7. 2.3 Inorganic Phosphorus Sorption 171 7. 2.4 Leaching 173 7. 2.5 Fertilizer Application 173 7. 2.6 Phosphorus Uptake by Plants 174 © 20 07 by Taylor & Francis Group, LLC 174 Modeling Phosphorus ... Environment 7. 3 Phosphorus Movement in Surface Runoff 175 7. 3.1 Soluble Phosphorus 175 7. 3.2 Organic and Mineral Phosphorus Attached to Sediment in Surface Runoff 175 7. 4 In- Stream Phosphorus Cycle 176 7. 5 ... al. 2002. Predicting sediment and phosphorus loads in the Rock RiverBasin using SWAT. Trans. ASAE 45(6): 175 7– 176 9.© 20 07 by Taylor & Francis Group, LLC Phosphorus Modeling in Soil and Water...
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Modeling phosphorus in the environment - Chapter 1 pptx
... working on a modeling approach to BMP evaluation (see Chapter 15 on BMPs in this book; Gitau et al. 2001). An initial step in modeling BMP-induced reduction in P loss is the characterization of the ... of the sediments will in uence the amount of sediment Pleaving the watershed in the Winooski River, Vermont. Thus, modeling of in- channel or fluvial processes must account for variability in ... loading ofreceiving water bodies (Beaulac and Reckhow 1982; Hanrahan et al. 2001;© 20 07 by Taylor & Francis Group, LLC12 Modeling Phosphorus in the Environment the principles of mapping...
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Modeling phosphorus in the environment - Chapter 2 ppsx
... dtpacccc=⋅++++−2 77 777 778 10132422.++ftc3qDASQ LWpDA=−200 07 0159 09 17 0 1 87 0 0166() ( ) . ..© 20 07 by Taylor & Francis Group, LLC24 Modeling Phosphorus in the Environment TABLE ... 75 83 87 Contoured Poor 63 74 82 85Good 61 73 81 84Contoured and terraced Poor 61 72 79 82Good 59 70 78 81(continued)© 20 07 by Taylor & Francis Group, LLC38 Modeling Phosphorus in the ... 59determine in ltration using the Green-Ampt or other in ltration equation and thento subtract in ltration from rainfall to determine the amount of runoff. The runoffhydrograph can then be determined...
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Modeling phosphorus in the environment - Chapter 4 potx
... on the size and spacing of the drains (van der Ploeg et al. 1999). Models described in the following chapterssimulate tile drain flow in a variety of ways, including the Richards equation linkedwith ... 1992. Phosphorus fertilization and environmental effects in the Netherlands and the Po region (Italy). Report 57, Dienst Landbouwkundig Onderzoek. The Winard Staring Centre, Wageningen, the Netherlands.Chardon, ... of mass linking them in an actual setting. 4.3 MODEL COMPONENTS AFFECTING P LEACHINGIncorporating complete or partial descriptions of P leaching into a simulation modelrequires coupling models...
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Modeling phosphorus in the environment - Chapter 5 potx
... detailed in Figure 5.1. The sediments were placed in the fluvarium to a 3-cm depth, and water was recir-culated over the sediment at a rate representing the average storm flow during 19 97 to 2004. The ... Novak et al. 2003). Phosphorus 124 Modeling Phosphorus in the Environment The concept of sediment EPC0 might provide a useful mechanism to simulate in- stream processes in these watershed models. ... trends in the St. Albans Bay, Vermont, watershed followingRCWP land treatment. Pp. 47 58 in The National Rural Clean Water Program sym-posium, U.S. Environmental Protection Agency, EPA-625-R-9 2-0 06,...
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Modeling phosphorus in the environment - Chapter 6 pot
... µtttT© 20 07 by Taylor & Francis Group, LLC156 Modeling Phosphorus in the Environment either that some of these complexities are unimportant in controlling the bulk of Pfluxes or that the model ... Does an inter-agency meeting in Washington imply uncertainty? Hydrol.Process. 18: 174 7– 175 0.Beven, K.J. 2004b. Response to “emergence of a new kind of relativism in environmentalmodelling: a ... rejecting a model becauseof errors in the data. Thus, in the case of the grazing inputs and the imbalance in the hydrological fluxes, it is argued that the rejection criteria should be relaxed as the model...
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Modeling phosphorus in the environment - Chapter 8 pdf
... was delineated intoFIGURE 8.4 Upper Etowah River basin with the solid dot indicating the watershed outlet atCanton, Georgia. The gray lines indicate the stream network, and the dark lines indicate ... 19 87 1988 1989 1990 199110008006004002000© 20 07 by Taylor & Francis Group, LLC204 Modeling Phosphorus in the Environment nine sub-basins. The area of watershed was 161,5 57 ha. The ... is the average in ltration rate, and this is used in determining the total) As IBAR increases, so does the amount of water that in ltrates. The water that goes into potential interflow isthe...
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Modeling phosphorus in the environment - Chapter 9 pptx
... (g/ha)Oct-96 Mar- 97 Sep- 97 Mar-98 Sep-98 Mar-99 Sep-99 Mar-00 Sep-00Time (months)120010008006004002000ObservedPredictedTotal P loss (g/ha)Oct-96 Mar- 97 Sep- 97 Mar-98 Sep-98 Mar-99 Sep-99 ... change in the input leadsto a 1% relative change in the output. A negative value indicates that input andoutput are inversely related. The greater the absolute value of the index, the greater the ... is the concentration of stable inorganic P at the beginningof a day (equals to the stable P at the end of the previous day) (mg/kg).Then, the inorganic P pools are further adjusted to add the...
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Modeling phosphorus in the environment - Chapter 10 ppsx
... net gainof sediments.sed_lossValue -8 35 - -7 5 0 -7 50 - -6 00 -6 00 - -4 50 -4 50 - -3 00 -3 00 - -1 50 -1 50 - 00 -1 50150 - 300300 - 450© 20 07 by Taylor & Francis Group, LLC24110ANSWERS-2000: ... represents the storage volume at the end of the time increment. The valueof Poj+1 is then replaced into Equation 10.28 to determine the value of the sediment-bound P in storage and then to calculate ... (10 .7) ANSWERS-2000 takes into account ponding under unsteady rainfall as pre-sented by Chu (1 978 ). Once the in ltration rate is determined, runoff is routed to the watershed outlet using Manning’s...
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Modeling phosphorus in the environment - Chapter 12 pps
... and then declines linearly to Savg and Smin as P5-day increases,as given in Figure 12.1. The relationship of S to P5-day is different for the dormantvs. the growing season. Breakpoint ... where in ltration excess is the dominantrunoff-generating mechanism. In humid, well-vegetated areas with shallow soils, suchas in the northeastern U.S., in ltration excess does not explain observed ... 290 Modeling Phosphorus in the Environment FIGURE 12.4 Dissolved P loadings (kg/yr) for baseline and management scenarios including corresponding percentreductions broken...
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