the supplies the product eutrophication: nutrient-driven stimulation of plant growth; contrast...
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The Supplies
The Product
eutrophication: nutrient-driven stimulation of plant growth; contrast natural and cultural eutrophication; phosphorus is most often the limiting nutrient in freshwaters.
CE5504. Lab 1 – Coupling Empirical and Mechanistic Models
Manifestations of eutrophication – algae and macrophytes
Manifestations of eutrophication - transparency
Dodson 2005
Manifestations of eutrophication – oxygen depletion
Temperature (°C)
Dep
th (
m)
Spring Summer
Manifestations of eutrophication – oxygen depletion
Manifestations of eutrophication – oxygen depletion
0
5
10
15
mg
O2
L-1
A M J J A S
2 12( )
/
hyp
AHOD gO m d
slope V A
slope hypolimnion thickness
BUDGET MODEL for phosphorus
W Q∙P
v∙As
As
V
s
dPV W Q P v Adt
TROPHIC STATE CORRELATIONS – phosphorus and chlorophyll
log total phosphorus (mgPm-3)
log
ch
loro
ph
yll
(mgm
-3)
0
1
-1
2
3
321-1 0
log Chl = 0.813log TP-0.240R2 = 0.59
(b)
TROPHIC STATE CORRELATIONS – chlorophyll and Secchi disk
Chlorophyll (mgm-3)
Sec
chi
Dis
k T
ran
spar
ency
(m
)
2.5 5 10 25 50 50
0.5
2.0
3.0
1.0
log SD = -0.54log Chl + 0.78R2 = 0.76
(a)
TROPHIC STATE CORRELATIONS – phosphorus and AHOD
Are
al H
ypo
lim
net
ic O
xyg
enD
eman
d (
gO
2m
-2d
-1)
Total Phosphorus (mgPm-3)
AHOD = 0.0145TP + 0.47R2 = 0.79
(c)
0.0
0.5
1.0
1.5
2.0
2.5
0 25 50 75 100 125
ASSIGNMENT: Lab 1. Coupling Empirical and Mechanistic Models