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Indian Journal of Geo-Marine Sciences (IJMS) >
IJMS Vol.40 [2011] >
IJMS Vol.40(1) [February 2011] >
| Title: | Changes of selected hydrological parameters in Hooghly estuary in response to a severe tropical cyclone (Aila) |
| Authors: | Mitra, A
Halder, P
Banerjee, K |
| Keywords: | Aila
Severe cyclonic storm (SCS)
Hooghly estuarine complex
Surface water salinity
pH
Dissolved oxygen (DO) |
| Issue Date: | Feb-2011 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Effects of Aila, a severe tropical cyclone
on three major hydrological parameters namely surface water salinity, pH and DO
in the western part of the deltaic Sundarbans region of Indian sub-continent at
the apex of Bay of Bengal is ascribed in the present study. It consists the in situ studies before and during Aila
at 12 sampling stations in the Hooghly estuarine complex and also extended our
studies further (ten days after the storm hit the Gangetic delta) to visualize
the situation of the aquatic phase. There were changes in surface water
salinity, pH and dissolved oxygen (DO) due to intrusion of saline water from
the Bay of Bengal. Due to this severe cyclonic storm, high energy tidal surges
increased the average salinity of surface water from 13.64±6.24 ppt to
17.08±8.03 ppt, which is a rise of 25.2%. Average pH changed from 7.99±0.20 to
8.01±0.21 which is an increase of 25.03%. Average DO decreased from 5.24±0.70
ppm to 4.95±0.51 ppm, which reflects a fall of 5.53% in the area of
investigation due to intrusion of sea water. Ten days after the Aila incidence
was over, the salinity and DO exhibited gradual restoration. Such drastic
changes of hydrological parameters due to natural calamities may pose an
adverse impact on the ecology of the deltaic complex and requires a systematic
planning to combat the ecological effect of the disaster. |
| Page(s): | 32-36 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1033 (Online); 0379-5136 (Print) |
| Source: | IJMS Vol.40(1) [February 2011]
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