Modeling phosphorus in the environment - Chapter 5 potx

... interactions in the Eucha-Spavinaw Basin, USA. J. Soil Water Conserv. 61:1 05 1 15. © 2007 by Taylor & Francis Group, LLC 1 05 5 Phosphorus Transport in Streams: Processes and Modeling Considerations Brian ... Agriculture-Agricultural Research Service, University Park, PA CONTENTS 5. 1 Introduction 1 05 5.2 Abiotic and Biotic Processes 106 5. 3 Phosphorus Spiraling 109...

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... kg -1 ) 0.0 0 .5 1.0 1 .5 2.0 400 300 200 100 0 Data Langmuir Isotherm GLEAMS - 15 d GLEAMS - 50 d GLEAMS - equilibrium © 2007 by Taylor & Francis Group, LLC 86 Modeling Phosphorus in the Environment Several ... 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...

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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 ... EPA-840-B9 3-1 00c, U.S. Govern- ment Printing Office, Washington, D.C. U.S. Environmental Protection Agency. 2000. The Total Maximum Daily Load (TMDL) program. EPA 841-F-0...

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... 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 rainfall that occurs during ... of highest intensity rainfall: (2.37) where α 0 .5 is the fraction of daily rain falling in the half hour of highest-intensity rainfall. If subdaily precipitation data are used in...

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... wk -1 ) Frequency Cumulative weighting 95 th 50 th 5 th 5 th 25 th 50 th 75 th 95 th max observed min Timestep Timestep Timestep 13 Timestep 14 Timestep 17 051 0 15 20 25 051 0 15 20 25 510 152 0 25 5 10 151 0 2020 30 10 20 30 25 510 152 0 25 510 152 0 25 © ... l -1 ) 200 0 -2 00 -4 00 -6 00 -8 00 -1 000 -1 200 -1 400 -1 600 MRP conc....

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... continuous simulation. The P cycle simulated in QUAL2E includes minimal sediment interactions. One sink of organic P is governed by the σ 5 parameter representing organic P settling, implying the ... Environment 7.3 Phosphorus Movement in Surface Runoff 1 75 7.3.1 Soluble Phosphorus 1 75 7.3.2 Organic and Mineral Phosphorus Attached to Sediment in Surface Runoff 1 75...

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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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... (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 ... Research/docs.htm?docid =51 99). The subwatersheds 224 Modeling Phosphorus in the Environment where actP i is the concentration of intermediate active inorganic P in the co...

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... net gain of sediments. sed_loss Value -8 35 - - 750 -7 50 - -6 00 -6 00 - - 450 -4 50 - -3 00 -3 00 - - 150 -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 int...

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... region of New York. Bias R 2 0.0 0 .5 1. 0-0 . 5- 1 .0 0.0 0 .5 1. 0-0 . 5- 1 .0 0.0 0 .5 1. 0-0 . 5- 1 .0 0.0 0 .5 1. 0-0 . 5- 1 .0 VSLF Calibrated CNs Dormant Season VSLF Calibrated CNs Growing Season GWLF Default CNs Dormant ... 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 diff...

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