Cyclone and Storm Surge - Iczmpwb.org

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maximum surge for this event was 6.97 meter. Twelve (12) offshore locations were selected in the
present study, four of which are in the vicinity of West Bengal and remaining in the Bangladesh. The
radius of maximum winds (R) for this event is approximately 40 kilometer with a pressure drop (ΔP) of
60 millibar. The computed surge along pre-defined location in the coastal West Bengal show a maximum
surge of 4.11 m off Patharprathima. In the immediate vicinity far east off Sunderbans, the computed
surge is 3.31 meters along New Moore Islands. Left of this track along Bakhali the computed surge is
3.81 m. The computed U and V components of velocity pertaining to surface currents are shown in
Figures-2b,c. It could be noticed a strong north-west component of current existed during this event.
Case -2: 1988 Gosaba Cyclone
Figure-3(a) show the track and computed surge for the 1988 Gosaba cyclone. The simulation for this
event was performed for 13 hours before the cyclone made its landfall off Gosaba. The computed
maximum surge for this event was 11.26 meter. In this study, twelve (12) offshore locations were
selected, four of which are in the coastal belt of West Bengal and the rest in Bangladesh. The radius of
maximum winds (R) is approximately 50 kilometer with a maximum pressure drop (∆P) of 71 millibar.
This event was considered the most severe in the past 113 years making landfall in this block. In the
vicinity far east Sunderbans (Moore Is., Station-4) the computed surge is 2.18 meter, whereas
immediate vicinity right of this track maximum computed surge was 4.78 meter off Bakhali. The
computed surge off Patharprathima was approximately 3.72 meter. The computed U and V components
of the surface currents are shown in Figures-3b,c. The surface currents exhibit strong easterly
component in the coastal belts of West Bengal having spatial variability of approximately 300 kilometers,
whereas east of Sunderbans the currents noticed were in the north-westerly direction.
Case -3: 1981 Namkhana Cyclone
The computed surge and track for the 1982 Namkhana cyclone is shown in Figure-4(a). The simulation
run for this event was performed for 21 hours. The radius of maximum winds was 60 Kilometer and
∆P=37 millibar. The computed maximum surge for this event was 4.47 meter. Figures-4b,c show the U
and V components associated with this event where the resultant currents are dominant easterly.
Case -4: 2002 Kulthali Cyclone
Figure-5(a) show the computed surge and track associated with this cyclone. The maximum surge for
this event is 3.5 meter. The radius of maximum winds and maximum pressure drop are 25 kilometer and
29 millibar respectively. The simulation run for this event before its landfall was made for 11 hours. From