Modeling phosphorus in the environment - Chapter 17 (end) pptx
Modeling phosphorus in the environment - Chapter 17 (end) pptx
... Modeling of Phosphorus 413
17. 10 SUMMARY
Much progress has been made in the modeling of P in the environment over the past
30 years. To continue this progress, the following improvements to modeling ... Georgia, Athens, GA
CONTENTS
17. 1 Introduction 405
17. 2 Runoff 406
17. 3 Soil Phosphorus Pools and Model Parameters 406
17. 4 Leaching of Phosphorus 408
17....
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 ... 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...
Modeling phosphorus in the environment - Chapter 2 ppsx
... 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...
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 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...
Modeling phosphorus in the environment - Chapter 5 potx
... 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. ... 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...
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
... Sorption 171
7.2.4 Leaching 173
7.2.5 Fertilizer Application 173
7.2.6 Phosphorus Uptake by Plants 174
© 2007 by Taylor & Francis Group, LLC
174 Modeling Phosphorus in the Environment
7.2.6 PHOSPHORUS ... Group, LLC
178 Modeling Phosphorus in the Environment
Green-Ampt in ltration equation, an improved weather generator, the ability to read
in daily...
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
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 the in...
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 Equation...