what can lake buoys tell us about a once in 250 year rainfall event – case study from lough feeagh...
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![Page 1: What can lake buoys tell us about a once in 250 year rainfall event – case study from Lough Feeagh Elvira de Eyto, Mary Dillane, Liz Ryder, Karin Sparber,](https://reader035.vdocument.in/reader035/viewer/2022062417/5514bb1455034640138b55ad/html5/thumbnails/1.jpg)
What can lake buoys tell us about a once in 250 year rainfall event – case study
from Lough Feeagh Elvira de Eyto, Mary Dillane, Liz
Ryder, Karin Sparber, Eleanor Jennings and Russell Poole
Gleon Wisconsin October 2009
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Rainfall on 2nd July 2009
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Lodge Gaulaun Buckagh Rough 2 Millrace Rough 3 BlackMaumeratt
aNamaroo
n
2nd July Total
64.8 46.8 60.8 56.4 52.9 42 42 30.840
2 hours 52.4 35.2 50.4 47.6 41.8 34.4 32 24.6 33.2
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
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lodge
gaulaun
rr2
buc
fur
rr3
blk
maum
nam
250 year return time for 2 hourly rainfall of > 44.7 mm
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01/0
1/20
0908
/01/
2009
15/0
1/20
0922
/01/
2009
29/0
1/20
0905
/02/
2009
12/0
2/20
0919
/02/
2009
26/0
2/20
0905
/03/
2009
12/0
3/20
0919
/03/
2009
30/0
3/20
0906
/04/
2009
13/0
4/20
0920
/04/
2009
27/0
4/20
0904
/05/
2009
11/0
5/20
0918
/05/
2009
25/0
5/20
09
01/0
6/20
0908
/06/
2009
15/0
6/20
0922
/06/
2009
29/0
6/20
0906
/07/
2009
13/0
7/20
0920
/07/
2009
27/0
7/20
0903
/08/
2009
0
1
2
3
4
5
6
7
Water Level (m)
Black river
01
/01
/20
09
07
/01
/20
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13
/01
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19
/01
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09
25
/01
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09
31
/01
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09
06
/02
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09
12
/02
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18
/02
/20
09
24
/02
/20
09
02
/03
/20
09
08
/03
/20
09
14
/03
/20
09
20
/03
/20
09
26
/03
/20
09
01
/04
/20
09
07
/04
/20
09
13
/04
/20
09
19
/04
/20
09
25
/04
/20
09
01
/05
/20
09
07
/05
/20
09
13
/05
/20
09
19
/05
/20
09
25
/05
/20
09
31
/05
/20
09
06
/06
/20
09
12
/06
/20
09
18
/06
/20
09
24
/06
/20
09
30
/06
/20
09
06
/07
/20
09
12
/07
/20
09
0
1
2
3
4
5
6
Water Level (m)
Rough river
(daily maximum water levels)
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Rough River 3-7-2009
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Feeagh Harbour
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0
100
200
300
400
500
600
Feb
-200
9
Mar
-200
9
Apr
-200
9
May
-200
9
Jun-
2009
Jul-
2009
Jul-
2009
Aug
-200
9
Dai
ly a
vere
age
Nep
hel
omet
er (
mV
)0
20
40
60
80
100
120
140
Dai
ly r
ain
fall
(mm
)
Daily Rainfall Nephelometer readings
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18/0
5/20
0614
/06/
2006
11/0
7/20
0607
/08/
2006
03/0
9/20
0630
/09/
2006
27/1
0/20
0623
/11/
2006
20/1
2/20
0616
/01/
2007
12/0
2/20
0711
/03/
2007
07/0
4/20
0704
/05/
2007
31/0
5/20
0727
/06/
2007
24/0
7/20
0720
/08/
2007
16/0
9/20
0713
/10/
2007
09/1
1/20
0706
/12/
2007
02/0
1/20
0829
/01/
2008
25/0
2/20
0823
/03/
2008
19/0
4/20
0816
/05/
2008
12/0
6/20
0809
/07/
2008
05/0
8/20
0801
/09/
2008
28/0
9/20
0825
/10/
2008
21/1
1/20
0818
/12/
2008
14/0
1/20
0910
/02/
2009
09/0
3/20
0905
/04/
2009
02/0
5/20
0929
/05/
2009
25/0
6/20
0922
/07/
2009
18/0
8/20
0914
/09/
2009
0
100
200
300
400
500
600
700
800 0
20
40
60
80
100
120
140
160
180
200
Nephelometer for 2004 – 2009 for context
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17 A
pril 2
007
6 Ju
ne 2
007
8 Au
gust
200
7
26 S
epte
mbe
r 200
7
24 O
ctob
er 2
007
16 N
ovem
ber 2
007
14 D
ecem
ber 2
007
8 Fe
brua
ry 2
008
18 M
arch
200
8
31 M
arch
200
8
29 A
pril 2
008
23 M
ay 2
008
23 J
une
2008
7 Au
gust
200
8
18 S
epte
mbe
r 200
8
24 O
ctob
er 2
008
3 D
ecem
ber 2
008
26 J
anua
ry 2
009
2 M
arch
200
9
16 A
pril 2
009
22 M
ay 2
009
22 J
une
2009
4 Au
gust
200
9
7 Se
ptem
ber 2
009
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Chlorophyll a µg l-1
flood
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9 J
an
ua
ry 2
00
42
5 M
arc
h 2
00
42
2 A
pri
l 20
04
6 J
uly
20
04
15
Se
pte
mb
er
20
04
31
Ja
nu
ary
20
05
11
Ap
ril 2
00
52
3 J
un
e 2
00
51
5 S
ep
tem
be
r 2
00
51
7 F
eb
rua
ry 2
00
62
8 M
arc
h 2
00
62
5 M
ay
20
06
11
Au
gu
st
20
06
6 D
ec
em
be
r 2
00
61
7 A
pri
l 20
07
14
Ju
ne
20
07
8 A
ug
us
t 2
00
72
6 S
ep
tem
be
r 2
00
73
1 O
cto
be
r 2
00
72
8 N
ov
em
be
r 2
00
71
Fe
bru
ary
20
08
18
Ma
rch
20
08
3 A
pri
l 20
08
13
Ma
y 2
00
82
3 J
un
e 2
00
87
Au
gu
st
20
08
27
Au
gu
st
20
08
26
Se
pte
mb
er
20
08
24
Oc
tob
er
20
08
3 D
ec
em
be
r 2
00
81
5 J
an
ua
ry 2
00
91
9 F
eb
rua
ry 2
00
92
Ma
rch
20
09
1 A
pri
l 20
09
29
Ap
ril 2
00
92
2 M
ay
20
09
11
Ju
ne
20
09
24
Ju
ne
20
09
4 A
ug
us
t 2
00
91
Oc
tob
er
20
09
0
0.5
1
1.5
2
2.5
3
Secchi Depth meters
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But what about the microbial loop?? Not sure yet
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• Longevity of sediment readings – how long to get back to baseline?
• Effects on the microbial loop
• Effects on stratification/thermocline (at the moment looks like nothing really changed
• Effects on metabolism
• Effect on Lough Furnace
• Write it up maybe after a full annual cycle
• Any ideas about what we might look for / additional analysis
Thanks to Gleon and the Gordon and Betty Moore Foundation