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 Surfa...

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... 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 P leaving the watershed in the Winooski River, Vermont. Thus, modeling of in- channel or fluvial processes mu...

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... dt pa cc cc =⋅ ++ ++ − 2 77 777 778 10 1 3 24 2 2 . ++       ft c 3 qDASQ LW p DA = − 200 07 0159 09 17 0 1 87 0 0166 () ( ) . . . © 20 07 by Taylor & Francis Group, LLC 24 Modeling Phosphorus in the Environment TABLE ... 75 83 87 Contoured Poor 63 74 82 85 Good 61 73 81 84 Contoured and terraced Poor 61 72 79 82 Good 59 70 78 81 (continued) © 20 07 by Tayl...

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... on the size and spacing of the drains (van der Ploeg et al. 1999). Models described in the following chapters simulate tile drain flow in a variety of ways, including the Richards equation linked with ... 1992. Phosphorus fertilization and environmental effects in the Netherlands and the Po region (Italy). Report 57, Dienst Landbouwkundig Onderzoek. The Winard Staring Cen...

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... 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 EPC 0 might provide a useful mechanism to simulate in- stream...

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... µ tt t T                © 20 07 by Taylor & Francis Group, LLC 156 Modeling Phosphorus in the Environment either that some of these complexities are unimportant in controlling the bulk of P fluxes 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...

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... was delineated into FIGURE 8.4 Upper Etowah River basin with the solid dot indicating the watershed outlet at Canton, Georgia. The gray lines indicate the stream network, and the dark lines indicate ... 19 87 1988 1989 1990 1991 1000 800 600 400 200 0 © 20 07 by Taylor & Francis Group, LLC 204 Modeling Phosphorus in the Environment nine sub-basins. The area of wate...

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... (g/ha) Oct-96 Mar- 97 Sep- 97 Mar-98 Sep-98 Mar-99 Sep-99 Mar-00 Sep-00 Time (months) 1200 1000 800 600 400 200 0 Observed Predicted Total P loss (g/ha) Oct-96 Mar- 97 Sep- 97 Mar-98 Sep-98 Mar-99 Sep-99 ... change in the input leads to a 1% relative change in the output. A negative value indicates that input and output are inversely related. The greater the absolute value of...

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... net gain of sediments. sed_loss Value -8 35 - -7 5 0 -7 50 - -6 00 -6 00 - -4 50 -4 50 - -3 00 -3 00 - -1 50 -1 50 - 0 0 -1 50 150 - 300 300 - 450 © 20 07 by Taylor & Francis Group, LLC 241 10 ANSWERS-2000: ... represents the storage volume at the end of the time increment. The value of Po j+1 is then replaced into Equatio...

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... and then declines linearly to S avg and S min as P 5-day increases, as given in Figure 12.1. The relationship of S to P 5-day is different for the dormant vs. the growing season. Breakpoint ... where in ltration excess is the dominant runoff-generating mechanism. In humid, well-vegetated areas with shallow soils, such as in the northeastern U.S., in ltration excess does...

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