Modeling phosphorus in the environment - Chapter 10 ppsx
Modeling phosphorus in the environment - Chapter 10 ppsx
... 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 Equatio...
Modeling phosphorus in the environment - Chapter 2 ppsx
... LLC
Modeling Runoff and Erosion in Phosphorus Models 59
determine in ltration using the Green-Ampt or other in ltration equation and then
to subtract in ltration from rainfall to determine the ... 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 th...
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 ... coastal waters. 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)
progra...
Modeling phosphorus in the environment - Chapter 4 potx
... lack continuity with modeling 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 ... 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 Ric...
Modeling phosphorus in the environment - Chapter 5 potx
... Agriculture-Agricultural Research
Service, University Park, PA
CONTENTS
5.1 Introduction 105
5.2 Abiotic and Biotic Processes 106
5.3 Phosphorus Spiraling 109
5.3.1 Determining Phosphorus Spiraling 109
5.3.2 ... 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- s...
Modeling phosphorus in the environment - Chapter 6 pot
... 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...
Modeling phosphorus in the environment - Chapter 7 docx
... NO
3
is the amount of nitrate in the soil layer (kg N ha
−1
).
The C:P ratio is calculated as
(7.14)
7.2.3 INORGANIC PHOSPHORUS SORPTION
The inorganic P pool, originating either from mineralization ... moving from the top 10 mm into the first soil layer
(kg P ha
−1
), P
solution,surf
is the amount of labile P in the top 10 mm (kg P ha
−1
), w
perc,surf
is the amou...
Modeling phosphorus in the environment - Chapter 8 pdf
... 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 ... LLC
212 Modeling Phosphorus in the Environment
modeling water movement in HSPF. Donigian and Love (2003) and U.S. Environ-
mental Protection Agency (2006) are helpful...
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-00
Time (months)
1200
100 0
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 the...
Modeling phosphorus in the environment - Chapter 12 pps
... 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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