42
Table 2.4 (continued)
Sl.
No. Name of cyclones
Date & Year
Intensity
(T-number)
Observed/Estimated max.
wind
23 Very Serere cyclonic storm
“SIDR”
11–16
November 2007
T-6.0
115 knots
24 Nargis
27th April–3rd
May 2008
T-5.0
Estimated 90 kts/167 kmph
(as per news paper
190 kmph)
25 Rashmi
25–27 October
2008
T-3.0
50 Knots 93 Kmph
26 Khaimuk
13–16
November 2008
T-2.5
40 Knots 74 Kmph
27 Nisha
25–27
November
T-3.0
45 Knots 83 Kmph
28 Cyclonic storm BIJLI
(Bay of Bengal)
14–17 April
2009
2.5
40 Knots 74 Kmph
29 Severe cyclonic storm
AILA (Bay of Bengal)
23–26 May 2009 3.5
60 Knots 112 Kmph
30 Cyclonic storm “Laila”
over Bay of Bengal
17–21 May,
2010
3.5
55 knots
31 Cyclonic storm “Giri”
over Bay of Bengal
20–23 October,
2010
5.5
105 knots
32 Cyclonic storm “Jal” over
Bay of Bengal
04–07
November, 2010
3.5
60 knots
Table 2.5 Variations of hydrological parameters in different phases before, during and after AILA
Stations
Surface
water
salinity
(Phase A)
Surface
water
salinity
(Phase B)
Surface
water
salinity
(Phase C)
pH
(Phase
A)
pH
(Phase
B)
pH
(Phase
C)
D.O
(Phase
A)
D.O
(Phase
B)
D.O
(Phase
C)
Stn. 1
3.41
3.99
3.45
7.65
7.65
7.65
5.71
4.98
5.23
Stn. 2
4.88
5.93
4.96
7.68
7.69
7.68
5.43
5.00
5.21
Stn. 3
6.10
7.53
6.18
7.70
7.70
7.70
6.63
6.03
6.50
Stn. 4
13.17
16.32
13.98
8.00
8.00
8.00
6.55
5.89
6.11
Stn. 5
12.05
14.95
12.78
8.10
8.11
8.10
4.80
4.74
5.31
Stn. 6
13.84
17.23
14.01
8.00
8.03
8.01
4.91
4.67
5.12
Stn. 7
15.55
19.40
15.98
8.10
8.11
8.11
4.80
4.65
5.32
Stn. 8
14.43
18.04
14.87
8.10
8.12
8.11
4.75
4.43
5.02
Stn. 9
17.22
21.58
17.96
8.10
8.11
8.11
4.60
4.54
5.99
Stn. 10 19.33
24.30
20.05
8.15
8.15
8.16
4.68
4.60
5.06
Stn. 11 20.58
25.93
21.00
8.20
8.21
8.21
5.05
4.99
5.19
Stn. 12 23.08
29.77
24.67
8.20
8.21
8.21
5.02
4.91
5.27
Phase A = pre-AILA period (18.05.2009), Phase B = AILA phase (27.05.2009), Phase C = postAILA phase (04.06.2009)
Units of surface water salinity and DO are PSU and ppm respectively
2 Mangroves: A Shield Against Storms and Wave Actions