Ressessment ofthe trophic status of
St Aubin’s Bay, Jersey2009-2010
A Report to Transport and Technical Services, States of Jersey
November 2010
Figures
0.20
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0.10
0.05
0.00
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
Width (m)
Dep
th (m
)
bn
dn
bn+1
dn+1
v0.6n v0.6n+1
Water surface
Figure 2.2 Discharge gauging example (based on the profile at St Peter’s Valley, site 104a, 14th May 2007)
St.
Aub
in's
B
aySt
. Hel
ier
Bello
zann
eW
wTW
Ww
TW O
utfa
ll
Vict
oria
Poo
l
Eliz
abet
hCa
stle
St. A
ubin
St. A
ubin
's
Fort
Seco
ndTo
wer
Firs
t Tow
er
Beac
hRo
ck
Noirm
ont
Poin
t
La H
aule
B
St. A
ubin
'sVa
lley
La H
aule
A
Wei
ghbr
idge
Out
fall
Bello
zann
eVa
lley
St. P
eter
sVa
lley
Wat
erw
orks
Valle
y
Gra
nds
Vaux
Valle
e de
s Va
ux
10
10
1010
5
5
5
5
5
5
5
552
2
2
2
B5
B4B3
B2
B1
Nipp
le R
ock
Ruau
dier
eBu
oy
ZONE
A
ZONE
B
ZONE
C
Catc
hmen
t Stre
amSa
mpl
ing
Poin
ts
Sew
age
Efflu
ent
Sam
plin
g Po
ints
Line
alo
ng w
hich
bea
ch
sam
ples
wer
e ta
ken
Lim
it of
Zon
e B
/ Zon
e C
Zone
A
Inte
rtid
al A
rea
Dept
hs a
re in
met
res
belo
w lo
wes
tas
trono
mic
al ti
de (–
5.88
m O
D)
01k
m
Fig
ure
2.3
Lo
cati
on
of
near
sho
re s
urf
zone
sam
ple
sit
es a
nd o
ffsh
ore
sur
vay
zone
s us
ed f
or
the
clas
sific
atio
n o
f sa
mp
les
0 0 2 4 6 Scale of kilometres
Zone A surface Zone B surface Zone B depth profile Zone C surface Zone C depth profile
Figure 2.4 Location of offshore sampling sites in zones A, B and C
0.00
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0.14
0.16
0.18
0.00 0.05 0.10 0.15 0.20 0.25
Dis
char
ge (
m3 /
s)
Staff Gauge (m)
Dis
char
ge (
m3 /
s)
Staff Gauge (m)
Dis
char
ge (
m3 /
s)
Staff Gauge (m)
Dis
char
ge (
m3 /
s)
Staff Gauge (m)
St Brelade’s streamY = 6.871 X2.532
r2(adj.) = 0.677, p = 0.000
Vallée des Vaux streamY = 0.556 X1.180
r2(adj.) = 0.717, p = 0.000
St Peter’s streamY = 22.872 X3.668
r2(adj.) = 0.780, p = 0.000
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35
0.00
0.02
0.04
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0.14
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.350.00
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0.25
0.30
0.35
0.40
0.45
0.50
0.00 0.05 0.10 0.15 0.20 0.25 0.30
Grands Vaux streamY = 1.780 X + 0.005r2(adj.) = 0.981, p = 0.000
2007 study data2009-2010 study data
X = staff gauge level (m)Y = discharge (m3/s)
Figure 3.1 Stage (m) - discharge (m3/s) rating curves for discharge gauging sites
0.1
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0.0
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1.0
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1.8
0.0
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0.8
1.0
1.2
0.00.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
St Brelade’s stream
Oct NovSep
Dis
char
ge (x
104 m
3 )
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
Dis
char
ge (x
104 m
3 )
25
20
15
10
5
0
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
Dis
char
ge (x
104 m
3 )
25
20
15
10
5
0
25
20
15
10
5
0
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
Dis
char
ge (x
104 m
3 )
25
20
15
10
5
0
Rai
nfal
l (m
m)
Rai
nfal
l (m
m)
Rai
nfal
l (m
m)
Rai
nfal
l (m
m)
St Peter’s Valley stream
Vallée des Vaux stream Grands Vaux stream
Jersey Airport Jersey Airport
Maison St Louis Maison St Louis
Figure 3.2 Daily discharge (m3) at stream gauging sites and rainfall (mm) at the closest rain gauge during the 2009 study period
1.02.03.04.05.06.0
.08.09.0
10.011.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
.0
8.0
9.0
10.0
0.0
Time (Days from 06:30 GMT 04/02/2010)
St Brelade’s stream
Dis
char
ge (x
104 m
3 )
Time (Days from 06:30 GMT 04/02/2010)
Dis
char
ge (x
104 m
3 )
Time (Days from 06:30 GMT 04/02/2010)
Dis
char
ge (x
104 m
3 )
Time (Days from 06:30 GMT 04/02/2010)
Dis
char
ge (x
104 m
3 )
Rai
nfal
l (m
m)
Rai
nfal
l (m
m)
Rai
nfal
l (m
m)
Rai
nfal
l (m
m)
St Peter’s Valley stream
Vallée des Vaux stream Grands Vaux stream
Jersey Airport Jersey Airport
Maison St Louis Maison St Louis
6050403020100
6050403020100
6050403020100
6050403020100
e Mar MayApr Jun Jul e Mar MayApr Jun Jul
e Mar MayApr Jun Jul e Mar MayApr Jun Jul
1.0
2.0
3.0
4.0
5.0
6.0
0.0
Figure 3.3 Daily discharge (m3) at stream gauging sites and rainfall (mm) at the closest rain gauge during the 2010 study period
1.0
2.0
3.0
4.0
5.0
6.0
.0
8.0
9.0
0.0
Time (Days from 06:30 GMT 04/02/2010)
Dis
char
ge (x
104 m
3 )
Rai
nfal
l (m
m)
Bello anne STBello anne ST
6050403020100
e Mar MayApr Jun Jul
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
Dis
char
ge (x
104 m
3 )
25
20
15
10
5
0
Rai
nfal
l (m
m)
Bello anne STBello anne ST
1.0
2.0
3.0
4.0
5.0
6.0
0.0
ull treatment Storm
Figure 3.4 Daily discharge (m3) at and rainfall (mm) at Bellozanne sewage treatment works during the 2009 and 2010 study periods
0
2
4
6
8
10
12
14
16
18
20
0
1
2
3
4
5
6
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
St Brelade’s stream La aule A stream
St Peter’s Valley stream outletLa aule B stream
ater or s Valley stream Bello anne Valley stream
Bello anne STeigh ridge stream
0
1
2
3
4
Dis
char
ge (x
104 m
3 )
Dis
char
ge (x
103 m
3 )D
isch
arge
(x10
3 m3 )
Dis
char
ge (x
103 m
3 )D
isch
arge
(x10
3 m3 )
Dis
char
ge (x
103 m
3 )D
isch
arge
(x10
4 m3 )
Dis
char
ge (x
104 m
3 )
0
1
2
3
3.5
0123456
891011
0
2
4
6
8
10
12
14St Peter s Valley
0
1
2
3
4
4.5
0
1
2
3
4
5
6
ull treatment Storm
10
20
30
40
50
60
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
once
ntra
tion
(mg/
l)
Figure 3.5 Dissolved available inorganic nitrogen concentrations (mg/l) and estimated daily discharge (m3) in surface water stream and sewage effluent inputs to St Aubin’s Bay June to November 2009
Sample results 4 ee running mean streamsee ly mean ST effluent
0123456
891011
0
1
2
3
4
5
Time (Days from 06:30 GMT 04/02/2010) e Mar
St Brelade’s stream La aule A stream
St Peter’s Valley streamLa aule B stream
ater or s Valley stream Bello anne Valley stream
Bello anne STeigh ridge stream
MayApr Jun JulTime (Days from 06:30 GMT 04/02/2010)
e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Dis
char
ge (x
104 m
3 )
Dis
char
ge (x
103 m
3 )D
isch
arge
(x10
4 m3 )
Dis
char
ge (x
103 m
3 )D
isch
arge
(x10
4 m3 )
Dis
char
ge (x
104 m
3 )D
isch
arge
(x10
4 m3 )
Dis
char
ge (x
104 m
3 )
ull treatment Storm
0
1
2
3
4
5
6
0
2
4
6
8
10
12
14
16
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
5
10
15
20
25
1
2
3
4
5
6
8
9
00
10
20
30
40
50
60
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
18
20
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
18
20
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
18
20
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
18
20
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
18
20
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
18
20
once
ntra
tion
(mg/
l)
0
2
4
6
8
10
12
14
16
18
20
once
ntra
tion
(mg/
l)
Figure 3.6 Dissolved available inorganic nitrogen concentrations (mg/l) and estimated daily discharge (m3) in surface water stream and sewage effluent inputs to St Aubin’s Bay February to July 2010
Sample results 4 ee running mean streamsee ly mean ST effluent
0
2
4
6
8
10
12
14
16
18
20
0
1
2
3
4
5
6
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep Jun Jul AugTime (Days from 05:30 GMT 03/06/2009)
Oct NovSep
St Brelade’s stream La aule A stream
St Peter’s Valley stream outletLa aule B stream
ater or s Valley stream Bello anne Valley stream
Bello anne STeigh ridge stream
0
1
2
3
4
Dis
char
ge (x
104 m
3 )
Dis
char
ge (x
103 m
3 )D
isch
arge
(x10
3 m3 )
Dis
char
ge (x
103 m
3 )D
isch
arge
(x10
3 m3 )
Dis
char
ge (x
103 m
3 )D
isch
arge
(x10
4 m3 )
Dis
char
ge (x
104 m
3 )
0
1
2
3
3.5
0123456
891011
0
2
4
6
8
10
12
14St Peter s Valley stream
0
1
2
3
4
4.5
0
1
2
3
4
5
6
ull treatment Storm
1
2
3
4
5
6
8
once
ntra
tion
(mg/
l)
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
once
ntra
tion
(mg/
l)
0.0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
once
ntra
tion
(mg/
l)
once
ntra
tion
(mg/
l)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.1
0.2
0.3
0.4
0.5
once
ntra
tion
(mg/
l)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.
0.8
0.9
once
ntra
tion
(mg/
l)
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
once
ntra
tion
(mg/
l)
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.00
once
ntra
tion
(mg/
l)
Figure 3.7 Dissolved available inorganic phosphorus concentrations (mg/l) and estimated daily discharge (m3) in surface water stream and sewage effluent inputs to St Aubin’s Bay June to November 2009
Sample results 4 ee running geometric mean streamsee ly mean ST effluent
0123456
891011
0
1
2
3
4
5
Time (Days from 06:30 GMT 04/02/2010) e Mar
St Brelade’s stream La aule A stream
St Peter’s Valley streamLa aule B stream
ater or s Valley stream Bello anne Valley stream
Bello anne STeigh ridge stream
MayApr Jun JulTime (Days from 06:30 GMT 04/02/2010)
e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Time (Days from 06:30 GMT 04/02/2010) e Mar MayApr Jun Jul
Dis
char
ge (x
104 m
3 )
Dis
char
ge (x
103 m
3 )D
isch
arge
(x10
4 m3 )
Dis
char
ge (x
103 m
3 )D
isch
arge
(x10
4 m3 )
Dis
char
ge (x
104 m
3 )D
isch
arge
(x10
4 m3 )
Dis
char
ge (x
104 m
3 )
ull treatment Storm
0
1
2
3
4
5
6
0
2
4
6
8
10
12
14
16
0
1
2
3
4
5
6
0
1
2
3
4
5
6
0
5
10
15
20
25
1
2
3
4
5
6
8
9
00
1
2
3
4
5
6
8
once
ntra
tion
(mg/
l)
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
once
ntra
tion
(mg/
l)
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
once
ntra
tion
(mg/
l)on
cent
ratio
n (m
g/l)
once
ntra
tion
(mg/
l)on
cent
ratio
n (m
g/l)
once
ntra
tion
(mg/
l)
once
ntra
tion
(mg/
l)
Figure 3.8 Dissolved available inorganic phosphorus concentrations (mg/l) and estimated daily discharge(m3) in surface water stream and sewage effluent inputs to St Aubin’s Bay February to July 2010
Sample results 4 ee running geometric mean streamsee ly mean ST effluent
95% CI
101(21)
102(14)
103(22)
104(20)
105(21)
106(18)
107(19)
301(159)
0
10
20
30
40
50
60
once
ntra
tion
(mg/
l)
Input
101(21)
102(14)
103(22)
104(20)
105(21)
106(18)
107(19)
301(157)
Input
0.001
0.01
0.1
1
10
once
ntra
tion
(mg/
l)
Dissolved available inorganic nitrogen (DAIN)
Dissolved available inorganic phosphorus (DAIP)
Inputs:101 St Brelade’s stream102 La Haule A stream103 La Haule B stream104 St Peter’s Valley stream105 Waterworks Valley stream106 Bellozanne Valley stream107 Weighbrdige stream301 Bellozanne STW final effluentFigures in parentheses denote the number of observations
Figure 3.9 Mean (geometric in the case of DAIP in stream inputs), range and 95% confidence interval (CI, shaded boxes) for the mean of DAIN and DAIP concentrations (mg/l) in inputs to St Aubin’s Bay 2009-2010
Max.
Mean
Min.
Month Month
Month Month
Month Month
Month
St Brelade’s stream La aule A stream
La aule B stream
ater or s Valley stream Bello anne Valley stream
Bello anne STeigh ridge stream
St Peter s Valley stream
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
100
200
300
400
500
600
00
800
900
1000
Load
(g/
d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
10
20
30
40
50
60
Load
(g/
d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
1
2
3
4
5
Load
(g/
d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
5
10
15
20
25
Load
(g/
d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
50
100
150
200
250
Load
(g/
d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
10
20
30
40
50
60
0
80
90
100
Load
(g/
d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
20
40
60
80
100
120
140
160
180
200
Load
(g/
d)
Bello anne Valley stream
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
50
100
150
200
250
300
350
400
450
Load
(g/
d)
2009 2010 2009 2010
2009 2010 2009 2010
2009 2010 2009 2010
2009 20102009 2010Month
Figure 3.10 Estimated monthly dissolved available inorganic nitrogen flux (kg/d) from surface water stream and sewage treatment works (STW) effluent inputs to St Aubin’s Bay during 2009 and 2010 study periods
Month Month
Month Month
Month Month
Month
St Brelade’s stream La aule A stream
La aule B stream
ater or s Valley stream Bello anne Valley stream
Bello anne STeigh ridge stream
St Peter s Valley stream
Load
(g/
d)
Load
(g/
d)
Load
(g/
d)
Load
(g/
d)
Load
(g/
d)
Load
(g/
d)
Load
(g/
d)
Load
(g/
d)
2009 2010 2009 2010
2009 2010 2009 2010
2009 2010 2009 2010
2009 20102009 2010Month
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
20
40
60
80
100
120
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0.00
0.10
0.20
0.30
0.40
0.50
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0.00
0.02
0.04
0.06
0.08
0.10
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.
0.8
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.
0.8
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Figure 3.11 Estimated monthly dissolved available inorganic phosphorus flux (kg/d) from surface water stream and sewage treatment works (STW) effluent inputs to St Aubin’s Bay during 2009 and 2010 study periods
Month Month
Month Month
Month Month
Month
St Brelade’s stream La aule A stream
La aule B stream
ater or s Valley stream Bello anne Valley stream
Bello anne STeigh ridge stream
St Peter s Valley stream
2009 2010 2009 2010
2009 2010 2009 2010
2009 2010 2009 2010
2009 20102009 2010Month
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
5000
10000
15000
20000
25000
30000
35000
Dis
char
ge (m
3 /d)
ull treatment Storm
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
500
1000
1500
2000
2500
3000
3500
4000
4500
Dis
char
ge (m
3 /d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
50
100
150
200
250
300
350
400
Dis
char
ge (m
3 /d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
200
400
600
800
1000
1200
1400
Dis
char
ge (m
3 /d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
Dis
char
ge (m
3 /d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
1000
2000
3000
4000
5000
6000
000
8000
9000
10000
Dis
char
ge (m
3 /d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
2000
4000
6000
8000
10000
12000
Dis
char
ge (m
3 /d)
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
5000
10000
15000
20000
25000
30000
35000
40000
Dis
char
ge (m
3 /d)
Figure 3.12 Estimated monthly discharge (m3/d) from surface water stream and sewage treatment works (STW) effluent inputs to St Aubin’s Bay during 2009 and 2010 study periods
Jun Jul2009 2010
Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
5
10
15
20
25
30
35
40
45on
cent
ratio
n (m
g/l)
Month
2009 2010Month
DA N
ST
St Brelade’s
La aule A
La aule B
St Peter’s Valley
ater or s Valley
Bello anne Valley
eigh ridge
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0.01
0.1
1
10
once
ntra
tion
(mg/
l)
DA P
Figure 3.13 Monthly concentrations (mg/l) of dissolved available inorganic nitrogen (DAIN) and phosphorus (DAIP) in stream and sewage effluent inputs to St Aubin’s Bay, estimated from monthly flux calculations
Jun
Month2009 2010
Month2009 2010
Month2009 2010
Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
20000
40000
60000
80000
100000
120000
Dis
char
ge (m
3 /d)
Discharge
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
200
400
600
800
1000
1200
1400
1600
1800
Load
(g/
d)
DA N
Jun Jul Aug Sep Oct Nov Dec Jan e Mar Apr May Jun Jul0
20
40
60
80
100
120
Load
(g/
d)
DA P
Broo sST effluent
Figure 3.14 Estimated total monthly discharge (m3) and flux of dissolved available inorganic nitrogen (DAIN, kg/d) and dissolved available inorganic phosphorus (DAIP, kg/d) from combined surface water stream inputs (brooks) and sewage treatment works (STW) effluent discharges to St Aubin’s Bay during 2009 and 2010 study periods
Fig
ure
3.15
Co
mp
aris
on
of
mo
nthl
y d
isch
arg
e (m
3 /d
ay),
dis
solv
ed a
vvai
lab
le in
org
anic
nit
rog
en (D
AIN
) and
pho
spho
rus
(DA
IP)
lo
ad (k
g/d
ay) e
stim
ates
to
St
Aub
in’s
Bay
dur
ing
thr
ee s
tud
ies
und
erta
ken
in 1
997,
200
7 an
d 2
009-
2010
Fina
l eff
luen
tB
roo
ks*D
AIN
= N
H3-
N +
NO
3-N
+ N
O2-
N, D
AIP
= P
O4-
P
eM
arAp
rM
ayJu
nJu
lAu
gSe
pO
ct0.
0x10
0
2.0x
104
4.0x
104
6.0x
104
8.0x
104
1.0x
105
1.2x
105
1.4x
105
1.6x
105
1.8x
105
Discharge (m3/day)
D. 2
007
stud
y D
isch
arg
e
Discharge (m3/day)
A. 1
997
stud
y D
isch
arg
e
eM
arAp
rM
ayJu
nJu
lAu
gSe
pO
ct0
500
1000
1500
2000
2500
3000
Load (g/day)
E. 2
007
stud
y D
AIN
*
Load (g/day)
B. 1
997
stud
y D
AIN
*
Load (g/day)
F. 2
007
stud
y D
AIP
*
eM
arAp
rM
ayJu
nJu
lAu
gSe
pO
ct050100
150
200
250
300
eM
arAp
rM
ayJu
nJu
lAu
gSe
pO
ct0.
0x10
0
2.0x
104
4.0x
104
6.0x
104
8.0x
104
1.0x
105
1.2x
105
1.4x
105
1.6x
105
1.8x
105
eM
arAp
rM
ayJu
nJu
lAu
gSe
pO
ct0
500
1000
1500
2000
2500
3000
eM
arAp
rM
ayJu
nJu
lAu
gSe
pO
ct050100
150
200
250
300
Load (g/day)
C. 1
997
stud
y D
AIP
*
0.0x
100
2.0x
104
4.0x
104
6.0x
104
8.0x
104
1.0x
105
1.2x
105
1.4x
105
1.6x
105
1.8x
105
Jun
JulA
ugSe
pOct
Nov
Dec
Jan
eM
arAp
rMay
JunJ
ulJu
nJu
lAug
SepO
ctN
ovD
ecJa
ne
Mar
AprM
ayJu
nJul
0
500
1000
1500
2000
2500
3000
Load (g/day)
Jun
JulA
ugSe
pOct
Nov
Dec
Jan
eM
arAp
rMay
JunJ
ul050100
150
200
250
300
Load (g/day)
Discharge (m3/day)
G. 2
009-
2010
stu
dy
Dis
char
ge
H. 2
009-
2010
stu
dy
DA
IN*
I. 20
09-2
010
stud
y D
AIP
*
B e n o 9 0 / 6 0 / 2 0
e n o 9 0 / 6 0 / 2 0
B e n o 9 0 / 6 0 / 0 3
e n o 9 0 / 6 0 / 0 3
e n o 9 0 / 0 / 8 2
1B e n o 9 0 / 8 0 / 1
1 e n o 9 0 / 8 0 / 1
B e n o 9 0 / 8 0 / 4 1
e n o 9 0 / 8 0 / 4 1
B e n o 0 1 / 3 0 / 1 0
e n o 0 1 / 3 0 / 1 0
B e n o 0 1 / 3 0 / 9 2
e n o 0 1 / 3 0 / 9 2
B e n o 0 1 / 4 0 / 6 2
e n o 0 1 / 4 0 / 6 2
B e n o 0 1 / 6 0 / 0
e n o 0 1 / 6 0 / 0
B e n o 0 1 / 6 0 / 8 2
e n o 0 1 / 6 0 / 8 2
20
15
20
15
3 20
15
4
4 20
15
20
15
20
15
20
15
20
13
n
0.1110100
m / l o m m ( N A D 3)
Max Min
95
M
ean
Max Min
95
M
ean
Zo
ne
B:
Zo
ne
C:
n n
umer
of
ose
rvat
ions
g
eom
etric
Fig
ure
3.16
G
eom
etri
c m
ean,
ran
ge
and
95%
co
nfid
ence
inte
rval
(CI,
shad
ed b
oxe
s) f
or
the
mea
n o
f d
isso
lved
ava
ilab
le
ino
rgan
ic n
itro
gen
(DA
IN) c
onc
entr
atio
ns in
zo
ne B
and
zo
ne C
fro
m s
urve
ys u
nder
take
n in
200
9 an
d 2
010.
0.010.111020
A D P m / l o m m ( 3)
B e n o 9 0 / 6 0 / 2 0
e n o 9 0 / 6 0 / 2 0
B e n o 9 0 / 6 0 / 0 3
e n o 9 0 / 6 0 / 0 3
e n o 9 0 / 0 / 8 2
1B e n o 9 0 / 8 0 / 1
1 e n o 9 0 / 8 0 / 1
B e n o 9 0 / 8 0 / 4 1
e n o 9 0 / 8 0 / 4 1
B e n o 0 1 / 3 0 / 1 0
e n o 0 1 / 3 0 / 1 0
B e n o 0 1 / 3 0 / 9 2
e n o 0 1 / 3 0 / 9 2
B e n o 0 1 / 4 0 / 6 2
e n o 0 1 / 4 0 / 6 2
B e n o 0 1 / 6 0 / 0
e n o 0 1 / 6 0 / 0
B e n o 0 1 / 6 0 / 8 2
e n o 0 1 / 6 0 / 8 2
20
15
20
15
3 20
15
4
4 20
15
20
15
20
15
20
15
20
13
n
2
Max Min
95
M
ean
Max Min
95
M
ean
Zone
B:
Zone
C:
n n
umer
of
ose
rvat
ions
g
eom
etric
Fig
ure
3.17
G
eom
etri
c m
ean,
ran
ge
and
95%
co
nfid
ence
inte
rval
(CI,
shad
ed b
oxe
s) f
or
the
mea
n o
f d
isso
lved
ava
ilab
le
in
org
anic
pho
spho
rus
(DA
IP) c
onc
entr
atio
ns in
zo
ne B
and
zo
ne C
fro
m s
urve
ys u
nder
take
n in
200
9 an
d 2
010.
B e n o 9 0 / 6 0 / 2 0
e n o 9 0 / 6 0 / 2 0
B e n o 9 0 / 6 0 / 0 3
e n o 9 0 / 6 0 / 0 3
e n o 9 0 / 0 / 8 2
1B e n o 9 0 / 8 0 / 1
1 e n o 9 0 / 8 0 / 1
B e n o 9 0 / 8 0 / 4 1
e n o 9 0 / 8 0 / 4 1
B e n o 0 1 / 3 0 / 1 0
e n o 0 1 / 3 0 / 1 0
B e n o 0 1 / 3 0 / 9 2
e n o 0 1 / 3 0 / 9 2
B e n o 0 1 / 4 0 / 6 2
e n o 0 1 / 4 0 / 6 2
B e n o 0 1 / 6 0 / 0
e n o 0 1 / 6 0 / 0
B e n o 0 1 / 6 0 / 8 2
e n o 0 1 / 6 0 / 8 2
20
15
20
15
3 20
15
4
4 20
15
20
15
20
15
20
15
20
13
n
11020 m / l o m m ( i S 3)
Max Min
95
M
ean
Max Min
95
M
ean
Zone
B:
Zone
C:
n n
umer
of
ose
rvat
ions
g
eom
etric
Fig
ure
3.18
G
eom
etri
c m
ean,
ran
ge
and
95%
co
nfid
ence
inte
rval
(CI,
shad
ed b
oxe
s) f
or
the
mea
n o
f d
isso
lved
rea
ctiv
e
silic
on
(DR
S) c
onc
entr
atio
ns in
zo
ne B
and
zo
ne C
fro
m s
urve
ys u
nder
take
n in
200
9 an
d 2
010.
B e n o 9 0 / 6 0 / 2 0
e n o 9 0 / 6 0 / 2 0
B e n o 9 0 / 6 0 / 0 3
e n o 9 0 / 6 0 / 0 3
e n o 9 0 / 0 / 8 2
1B e n o 9 0 / 8 0 / 1
1 e n o 9 0 / 8 0 / 1
B e n o 9 0 / 8 0 / 4 1
e n o 9 0 / 8 0 / 4 1
B e n o 0 1 / 3 0 / 1 0
e n o 0 1 / 3 0 / 1 0
B e n o 0 1 / 3 0 / 9 2
e n o 0 1 / 3 0 / 9 2
B e n o 0 1 / 4 0 / 6 2
e n o 0 1 / 4 0 / 6 2
B e n o 0 1 / 6 0 / 0
e n o 0 1 / 6 0 / 0
B e n o 0 1 / 6 0 / 8 2
e n o 0 1 / 6 0 / 8 2
0123456 mg/m3) ( l l y h p o r o l h
20
15
20
15
3 20
15
4
4 20
15
20
15
20
15
20
15
20
13
n
Max Min
95
M
ean
Max Min
95
M
ean
Zone
B:
Zone
C:
n n
umer
of
ose
rvat
ions
g
eom
etric
Fig
ure
3.19
G
eom
etri
c m
ean,
ran
ge
and
95%
co
nfid
ence
inte
rval
(CI,
shad
ed b
oxe
s) f
or
the
mea
n o
f C
hlo
rop
hyll a
co
ncen
trat
ions
in z
one
B a
nd z
one
C f
rom
sur
veys
und
erta
ken
in 2
009
and
201
0.
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
mol
m3 )
DA N
one B
one
DA P
B B B
B
B
B
B B J J J
J
J
J
J
0
2
4
6
8
10
12
14
16
1-Ju
n-20
09
1-Ju
l-20
09
1-A
ug-2
009
1-S
ep-2
009
1-O
ct-2
009
1-N
ov-2
009
1-D
ec-2
009
1-Ja
n-20
10
1-Fe
b-2
010
1-M
ar-2
010
1-A
pr-
2010
1-M
ay-2
010
1-Ju
n-20
10
1-Ju
l-20
10
JJ
B B
B
B
B
B
B
B JJ
J
J
J
J
J J
0
0. 1
0. 2
0. 3
0. 4
0. 5
0. 6
0. 7
1-Ju
n-20
09
1-Ju
l-20
09
1-A
ug-2
009
1-S
ep-2
009
1-O
ct-2
009
1-N
ov-2
009
1-D
ec-2
009
1-Ja
n-20
10
1-Fe
b-2
010
1-M
ar-2
010
1-A
pr-
2010
1-M
ay-2
010
1-Ju
n-20
10
1-Ju
l-20
10
STT interhypernutrificationthreshold
J
one B
one
STT interhypernutrificationthreshold
J
ncluding site xcluding site
ncluding site xcluding site J
Figure 3.20 Geometric mean dissolved available inorganic nitrogen (DAIN) and dissolved available inorganic phosphorus (DAIP) concentrations in zone B and zone C in 2009 and 2010. Two geometric mean values are shown for zone C on 28/06/10, one including and one excluding the anomalous results for site C7.
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
g m
3 )DRS
one B
one
hlorophyll
J
one B
one
STT summereutrophicationthreshold
J
B B
B
B
B
B
B
B
J
J
J
J
J
J
J
J
0
2
4
6
8
10
12
1-Ju
n-20
09
1-Ju
l-20
09
1-A
ug-2
009
1-S
ep-2
009
1-O
ct-2
009
1-N
ov-2
009
1-D
ec-2
009
1-Ja
n-20
10
1-Fe
b-2
010
1-M
ar-2
010
1-A
pr-
2010
1-M
ay-2
010
1-Ju
n-20
10
1-Ju
l-20
10
B B
B B
B
B
B B
JJ J J
J
J
JJ
0
2
4
6
8
10
12
1-Ju
n-20
09
1-Ju
l-20
09
1-A
ug-2
009
1-S
ep-2
009
1-O
ct-2
009
1-N
ov-2
009
1-D
ec-2
009
1-Ja
n-20
10
1-Fe
b-2
010
1-M
ar-2
010
1-A
pr-
2010
1-M
ay-2
010
1-Ju
n-20
10
1-Ju
l-20
10
J
ncluding site
xcluding site
Figure 3.21 Geometric mean dissolved reactive silicon (DRS) and chlorophyll a in zone B and zone C in 2009 and 2010. Two geometric mean values are shown for zone C DRS on 28/06/10, one including and one excluding the anomalous results for site C7.
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
mol
m3 )
ON B
199 Surveys
2009 Surveys
2010 Surveys
ON
STT interhypernutrificationthreshold
J
B B
B B B
B B B
B
J J J
H
H
H
H H
0
2
4
6
8
10
12
14
16
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
B B
B
B B
B B
B
B
J J J
H
H
H
H H
0
2
4
6
8
10
12
14
16
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
H
199 Surveys
2009 Surveys
2010 Surveys
STT interhypernutrificationthreshold
J
H
Figure 3.22 Comparison between 1997, 2009 and 2010 geometric mean dissovled available inorganic nitrogen (DAIN) concentrations in zone B and zone C.
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
mol
m3 )
ON B
199 Surveys
2009 Surveys
2010 Surveys
ON
STT interhypernutrificationthreshold
J
H
199 Surveys
2009 Surveys
2010 Surveys
STT interhypernutrificationthreshold
J
H
B
B
B
B
B
B
B
B
B
JJ
J
H
H
HH
H
0
0. 1
0. 2
0. 3
0. 4
0. 5
0. 6
0. 7
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
B
B
B B
B
B
B B
B
JJ
J
H
H
H
H H
0
0. 1
0. 2
0. 3
0. 4
0. 5
0. 6
0. 7
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
Figure 3.23 Comparison between 1997, 2009 and 2010 geometric mean dissovled available inorganic phosphorus (DAIP) concentrations in zone B and zone C.
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
mol
m3 )
ON B
199 Surveys
2009 Surveys
2010 Surveys
ON
J
H
199 Surveys
2009 Surveys
2010 Surveys
J
H
B
B B
B B
B B
B
B J
J
J
H
HH
H
H
0
2
4
6
8
10
12
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
B
B
B
B
B B
B
B
B J
J
J
H
H
H
H
H
0
2
4
6
8
10
12
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
Figure 3.24 Comparison between 1997, 2009 and 2010 geometric mean dissovled reactive silicon concentrations in zone B and zone C.
once
ntra
tion
(mg
m3 )
once
ntra
tion
(mg
m3 )
ON B
199 Surveys
2009 Surveys
2010 Surveys
ON
STT summereutrophicationthreshold
J
H
199 Surveys
2009 Surveys
2010 Surveys
STT summereutrophicationthreshold
J
H
B
B
B B B B
B B B J
JJH
H
H
HH
0
2
4
6
8
10
12
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
B
B
B
B B B
B
B B J
J JH
H
H
HH
0
2
4
6
8
10
12
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
Figure 3.25 Comparison between 1997 mean, and 2009 and 2010 geometric mean chlorophyll a concentrations in zone B and zone C.
1614121086420
0 . 3 1
1 . 3 1
2 . 3 1
3 . 3 1
4 . 3 1
5 . 3 1
6 . 3 1
. 3 1
8 . 3 1
9 . 3 1
0 . 4 1
) m ( h t p e D
T
1614121086420 104
105
106
10
108
109
1 10
11 1
) m ( h t p e D
Oxy
gen
satu
ratio
n (
)
1614121086420 9.1
9.2
9.3
9.4
9.5
9.6
9.
) m ( h t p e D
Oxy
gen
(mg/
l)
1614121086420 28.0
28
.1
28.2
28
.3
28.4
28
.5
) m ( h t p e D
Salin
ity (p
pt)
Site
B21
Site
B24
Site
B30
Site
B34
Site
B38
Site
B42
Fig
ure
3.26
a R
esul
ts o
f so
nde
dep
th p
rofil
e m
oni
tori
ng a
t si
tes
in o
ffsh
ore
zo
ne B
on
07/0
6/20
10
Dis
solv
ed o
xyge
n (m
g/l)
Salin
ity
Dis
solv
ed o
xyge
n (
)
Tem
pera
ture
302520151050
. 2 1
8 . 2 1
9 . 2 1
0 . 3 1
1 . 3 1
2 . 3 1
3 . 3 1
4 . 3 1
5 . 3 1
6 . 3 1
. 3 1
) m ( h t p e D
T
302520151050
0 . 4 0 1
5 . 4 0 1
0 . 5 0 1
5 . 5 0 1
0 . 6 0 1
5 . 6 0 1
0 . 0 1
5 . 0 1
0 . 8 0 1
) m ( h t p e D
Oxy
gen
satu
ratio
n (
)
302520151050 9.1
9.2
9.3
9.4
9.5
9.6
) m ( h t p e D
Oxy
gen
(mg/
l)
302520151050 28.0
28
.1
28.2
28
.3
28.4
) m ( h t p e D
Salin
ity (p
pt)
Dis
solv
ed o
xyge
n (m
g/l)
Salin
ity
Dis
solv
ed o
xyge
n (
)
Tem
pera
ture
Fig
ure
3.26
b R
esul
ts o
f so
nde
dep
th p
rofil
e m
oni
tori
ng a
t si
tes
in o
ffsh
ore
zo
ne C
on
07/0
6/20
10
181614121086420
8 . 4 1
8 . 4 1
9 . 4 1
0 . 5 1
0 . 5 1
0 . 5 1
1 . 5 1
2 . 5 1
2 . 5 1
2 . 5 1
3 . 5 1
) m ( h t p e D
T
181614121086420 105
106
106
106
10 1
08
108
108
109
) m ( h t p e D
Oxy
gen
satu
ratio
n (
)
181614121086420 8.9
9.0
9.1
9.2
9.3
) m ( h t p e D
Oxy
gen
(mg/
l)
181614121086420 26.0
26
.5
2.0
2
.5
28.0
28
.5
) m ( h t p e D
Salin
ity (p
pt)
Site
B21
Site
B24
Site
B30
Site
B34
Dis
solv
ed o
xyge
n (m
g/l)
Salin
ity
Dis
solv
ed o
xyge
n (
)Te
mpe
ratu
re
Fig
ure
3.27
a R
esul
ts o
f so
nde
dep
th p
rofil
e m
oni
tori
ng a
t si
tes
in o
ffsh
ore
zo
ne B
on
28/0
6/20
10
302520151050 14.
14
.8
14.9
15
.0
15.1
15
.2
) m ( h t p e D
T
302520151050
0 . 5 0 1
5 . 5 0 1
0 . 6 0 1
5 . 6 0 1
0 . 0 1
5 . 0 1
0 . 8 0 1
5 . 8 0 1
0 . 9 0 1
) m ( h t p e D
Oxy
gen
satu
ratio
n (
)
302520151050 8.8
8.9
9.0
9.1
9.2
9.3
) m ( h t p e D
Oxy
gen
(mg/
l)
302520151050 2.8
28
.0
28.2
28
.4
28.6
28
.8
29.0
) m ( h t p e D
Sali n
ity (p
pt)
Dis
solv
ed o
xyge
n (m
g/l)
Salin
ity
Dis
solv
ed o
xyge
n (
)
Tem
pera
ture
Fig
ure
3.27
b R
esul
ts o
f so
nde
dep
th p
rofil
e m
oni
tori
ng a
t si
tes
in o
ffsh
ore
zo
ne C
on
28/0
6/20
10
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
mol
m3 )
DA N
DA P
STT interhypernutrificationthreshold
K
K
K
K
K K
K
K
K
K
K
K
K
K K
K
K
K
K
K
K
K
K K K K K K
K
K K K
K
K
K K
K
K K
K
K
K K K
J J
J J
J J
J
J
J
J
J
J
J
J J
J J
J J
J
J J
1/6/
2009
15/6
/200
9
29/6
/200
9
13/7
/200
9
27/7
/200
9
10/8
/200
9
24/8
/200
9
2/9/
2009
14/9
/200
9
29/9
/200
9
15/1
0/20
09
27/1
0/20
09
8/2/
2010
2/3/
2010
15/3
/201
0
30/3
/201
0
12/4
/201
0
26/4
/201
0
20/5
/201
0
8/6/
2010
16/6
/201
0
1/7/
2010
1/6/
2009
15/6
/200
9
29/6
/200
9
13/7
/200
9
27/7
/200
9
10/8
/200
9
24/8
/200
9
2/9/
2009
14/9
/200
9
29/9
/200
9
15/1
0/20
09
27/1
0/20
09
8/2/
2010
2/3/
2010
15/3
/201
0
30/3
/201
0
12/4
/201
0
26/4
/201
0
20/5
/201
0
8/6/
2010
16/6
/201
0
1/7/
2010
0. 5
1
10
100
200
K
K
K K K K
K K
K
K
K
K K
K K
K
K
K K
K
K
K
K
K
K
K K
K K
K
K
K
K
K
K
K K
K K K K
K K
K
J
J J
J J
J
J J
J
J
J J
J
J J J J J J
J J
J
0.01
0. 1
1
10
Max
Min
95 GeometricMean
STT interhypernutrificationthreshold
Max
Min
95 GeometricMean
Figure 3.28 Geometric mean, range and 95% confidence interval (CI, shaded boxes) for the mean of dissolved available inorganic nitrogen (DAIN) and dissolved available inorganic phosphorus (DAIP) concentrations in the nearshore surf zone from surveys undertaken in 2009 and 2010.
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
g m
3 )DRS
hlorophyll
STT summereutrophicationthreshold
1/6/
2009
15/6
/200
9
29/6
/200
9
13/7
/200
9
27/7
/200
9
10/8
/200
9
24/8
/200
9
2/9/
2009
14/9
/200
9
29/9
/200
9
15/1
0/20
09
27/1
0/20
09
8/2/
2010
2/3/
2010
15/3
/201
0
30/3
/201
0
12/4
/201
0
26/4
/201
0
20/5
/201
0
8/6/
2010
16/6
/201
0
1/7/
2010
1/6/
2009
15/6
/200
9
29/6
/200
9
13/7
/200
9
27/7
/200
9
10/8
/200
9
24/8
/200
9
2/9/
2009
14/9
/200
9
29/9
/200
9
15/1
0/20
09
27/1
0/20
09
8/2/
2010
2/3/
2010
15/3
/201
0
30/3
/201
0
12/4
/201
0
26/4
/201
0
20/5
/201
0
8/6/
2010
16/6
/201
0
1/7/
2010
Max
Min
95 GeometricMean
Max
Min
95 GeometricMean
K K K K
K
K
K
K
K K
K K
K
K K
K K K
K
K
K K
K K
K K
K K
K
K
K
K
K K K K
K
K K K
K K
K
K
J J J
J
J J
J
J
J J
J J
J
J J
J J J
J
J
J
J
0. 5
1
10
100
K K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K
K K K
K
K
K
K K
K
K
K
K
K
K
K K
K
K
K
K
K K
K
J J
J J
J
J
J
J
J
J
J
J
J
J J
J
J
J
J
J
J
J 0
5
10
15
20
25
30
35
40
45
Figure 3.29 Geometric mean, range and 95% confidence interval (CI, shaded boxes) for the mean of dissolved reactive silicon (DRS)) and chlorophyll a concentrations in the nearshore surf zone from surveys undertaken in 2009 and 2010.
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
mol
m3 )
DA N
199 Surveys
2009 Surveys
2010 Surveys
DA P
STT interhypernutrificationthreshold
J
H
199 Surveys
2009 Surveys
2010 Surveys
STT interhypernutrificationthreshold
J
H
B
B
B B
B
B B
B B B
B
B
B
B B
J
J
JJ
JJ
JJJJJJ HHH
HH
HH
HH
H
0
5
10
15
20
25
30
35
40
45
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
B
B B B
B
B
B
B
B
B
B
B
B
B
B
JJ
J
JJJ
J
JJJJ
JH
HH
HHH
HHH
H
0
0. 5
1
1. 5
2
2. 5
3
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
Figure 3.30 Geometric mean (2009/10 data) dissolved available inorganic nitrogen (DAIN) and dissolved available inorganic phosphorus (DAIP) concentrations in the nearshore surf zone in 1997, 2009 and 2010.
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
g m
3 )DRS
199 Surveys
2009 Surveys
2010 Surveys
hlorophyll
J
H
199 Surveys
2009 Surveys
2010 Surveys
STT summereutrophicationthreshold
J
H
B B
B B
B B
B
B
B B
B
B B
B
B
J
J
JJ
J
J
JJ
JJJJ
HH
HH
HHH
HH
H
0
5
10
15
20
25
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
B B
B
B
B
B
B
B B
B
B
B B
B B
J
J
J
J
J
J
J
J
JJ
JJ
H
H
H
H
H
H
H
HH
H
0
5
10
15
20
25
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
Figure 3.31 Mean (1997 chlorophyll a data) and geometric mean (2009/10 data) dissolved reactive silicon and chlorophyll a concentrations in the nearshore surf zone in 1997, 2009 and 2010.
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
mol
m3 )
DA N
199 Surveys
2009 Surveys
2010 Surveys
DA P
STT interhypernutrificationthreshold
J
H
199 Surveys
2009 Surveys
2010 Surveys
STT interhypernutrificationthreshold
J
H
B
B
B
B B
B
B
B
B
J JJ
H
H
H
H H
0
2
4
6
8
10
12
14
16
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
B
B
B
B
B
B
B B
B
J J
J
H
H
H
H H
0
0. 1
0. 2
0. 3
0. 4
0. 5
0. 6
0. 7
0. 8
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
Figure 4.1 Predicted steady-state dissolved available inorgnaic nitrogen (DAIN) and dissolved available inorganic phosphorus (DAIP) concentrations in zone B for offshore surveys undertaken in 1997, 2009 and 2010.
once
ntra
tion
(mm
ol m
3 )on
cent
ratio
n (m
mol
m3 )
DA N
2009 Predicted
2009 O served
2010 Predicted
DA P
STT interhypernutrificationthreshold
J
H
2010 O served F
2009 Predicted
2009 O served
2010 Predicted
STT interhypernutrificationthreshold
J
H
2010 O served F
B B B
J J J
H
H
H
H H
F
F
F
F F
0
2
4
6
8
10
12
14
16
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
B B
B
JJ
J
H
H
H
H H
F
F
FF
F
0
0. 1
0. 2
0. 3
0. 4
0. 5
0. 6
0. 7
0. 8
1-Fe
b
1-M
ar
1-A
pr
1-M
ay
1-Ju
n
1-Ju
l
1-A
ug
1-S
ep
1-O
ct
1-N
ov
Figure 4.2 Comparison of observed geometric mean concentrations with predicted steady-state concentrations for dissolved available inorgnaic nitrogen (DAIN) and dissolved available inorganic phosphorus (DAIP) in zone B for surveys undertaken in 2009 and 2010.
once
ntra
tion
(mg
m3 )
Predicted value using median’ yield (1.1 mg chl (mmol DA N) 1 ) Predicted value using 90 ile yield (2.8 mg chl (mmol DA N) 1 )
STT summer eutrophication threshold
K K
K
K K K K
K
K
K K K
K K
K
K K
K
K
K
K K
K
K
K
K
K K K
K
K
K
K K
27/2
/200
9
2/4/
2009
30/4
/200
9
2/6/
2009
7/1/
2009
29/7
/200
9
9/9/
2009
30/9
/200
9
29/1
0/20
09
2/6/
2009
30/6
/200
9
11/8
/200
9
1/3/
2010
29/3
/201
0
26/4
/201
0
7/6/
2010
28/6
/201
0
0
5
10
15
20
25
30
35
40
45
50
K
K
199K
K
2009K
K
2010
DA N max range
199 2009 2010
Figure 4.3 Predicted maximum phytoplankton biomass chlorophyll a concentrations (Xmax) in zone B (St. Aubin’s Bay) during surveys undertaken in 1997, 2009 and 2010. The mimimum value of the range was predicted using the median yield of phytoplankton chlorophyll as recommended by CSTT (1997). The maximum value of the range was predicted using the 90 percentile yield value.
once
ntra
tion
(mg
m3 )
O served geometric mean chlorophyll concentration
2009 2010
K K K
KK
K
KK
K KK
K
K
K
KK
J J J J
JJ
J J
2/6/
2009
30/6
/200
9
11/8
/200
9
1/3/
2010
39/3
/201
0
26/4
/201
0
7/6/
2010
28/6
/201
0
0
5
10
15
20
25
30
35
40
45
J
Figure 4.4 Comparison of the range or predicted maximum phytoplankton biomass chlorophyll a concentrations (Xmax) with observed geometric mean chlorophyll a concentrations in zone B (St. Aubin’s Bay) during surveys undertaken in 2009 and 2010. The mimimum value of the modelled range was predicted using the median yield of phytoplankton chlorophyll as recommended by CSTT (1997). The maximum value of the range was predicted using the 90 percentile yield value.
Predicted value using median’ yield (1.1 mg chl (mmol DA N) 1 ) Predicted value using 90 ile yield (2.8 mg chl (mmol DA N) 1 )
STT summer eutrophication threshold
K
K
2009K
K
2010
DA N max range