Modeling phosphorus in the environment - Chapter 16 pps

... 390 Modeling Phosphorus in the Environment financial investment. Another potential disadvantage of automated samplers is their utilization of a single intake point, which is discussed in detail in ... sampling settings (storm sampling thresh- old, sampling interval, discrete/composite sampling) directly affects the uncertainty of storm water quality data. These settings determi...

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... LLC 44 Modeling Phosphorus in the Environment field (drainage) boundary to the outlet of the field. This length and difference in elevation from the most remote point to the outlet are the same ... rain falling during the time of concentration, R tc , was proportional to the amount of rain falling during the 24-h period, or where α tc is the fraction of daily rai...

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... net gain of sediments. sed_loss Value -8 35 - -7 50 -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 © 2007 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 Equation...

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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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... 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 ... overlying waters. In the short term, however, river flow and physical properties of the sediments will in uence the amount of sediment P leaving the watershed in th...

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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 ... routines depicting P leaching in the soil profile. Recent interest in determining P leaching losses may lead to alternative methods for modeling P leaching. Simplified forms...

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... 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 processes in these watershed models. ... watershed, FD-36, 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 represen...

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... rejecting a model because of 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 ... assess- ing the inputs at the measurement scale, together with interpolation errors in space and time to provide the values required at the lumped or distr...

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... Background 164 7.2 Phosphorus Modeling in SWAT: Soil Phosphorus Interactions 167 7.2.1 Initialization of Soil Phosphorus Levels 168 7.2.2 Mineralization, Decomposition, and Immobilization 170 7.2.3 Inorganic ... Taylor & Francis Group, LLC 172 Modeling Phosphorus in the Environment the solution (labile) and active mineral pools is estimated using the followin...

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... 194 Modeling Phosphorus in the Environment 0.1; D: 0.01 to 0.05); default is 0 .16 in. hr −1 ; suggests that Z *INFILT* INTFN should approximate the long-term in ltration rate, or permeability, in ... 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...

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