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Ressessment of the trophic status of St Aubin’s Bay, Jersey 2009-2010 A Report to Transport and Technical Services, States of Jersey November 2010 Figures
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Page 1: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

Ressessment ofthe trophic status of

St Aubin’s Bay, Jersey2009-2010

A Report to Transport and Technical Services, States of Jersey

November 2010

Figures

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0.20

0.15

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)

Page 3: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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St. A

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St. A

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er

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ck

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St. A

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idge

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St. P

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Wat

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orks

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ent

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ure

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Page 4: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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

Page 5: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

0.00

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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

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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

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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

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0

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char

ge (x

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3 )

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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

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1.02.03.04.05.06.0

.08.09.0

10.011.0

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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

Page 8: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

1.0

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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

Page 9: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

0

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0

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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

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0123456

891011

0

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14St Peter s Valley

0

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ull treatment Storm

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l)

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l)

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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

Page 10: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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

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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

Page 11: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

0

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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

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0123456

891011

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0

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ull treatment Storm

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l)

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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

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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

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(x10

4 m3 )

Dis

char

ge (x

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ull treatment Storm

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once

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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

Page 13: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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.

Page 14: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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

Page 15: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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

Page 16: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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

Page 17: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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

Page 18: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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

Page 19: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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

*

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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.

Page 21: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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.

Page 22: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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.

Page 23: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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.

Page 24: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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.

Page 25: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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.

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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.

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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.

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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.

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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.

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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

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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

Page 32: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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

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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

Page 34: Ressessment of the trophic status of St Aubin’s Bay ... of Information library... · e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul e Mar MayApr Jun Jul 1.0 2.0

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.

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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.

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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.

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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.

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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.

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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.

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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.

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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


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