Cyclone and Storm Surge - Iczmpwb.org

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HAZARD ASSESSMENT AND DISASTER MITIGATION FOR WEST BENGAL DUE TO TROPICAL CYCLONES Project sponsored by Department of Disaster Management, Government of West Bengal Report prepared by: Indian Institute of Technology, Kharagpur September, 2006
Acknowledgement This project was completed with the help extended by many organizations and individuals, to whom we are equally grateful. However, it is not possible to name all, and we wish to record our sincere thanks to the following Government departments and offices: 1. Department of Disaster Management, Government of West Bengal 2. Department of Irrigation and Waterways, Government of West Bengal 3. Department of Land Records and Surveys, Government of West Bengal 4. Sundarban Development Board, Government of West Bengal Acknowledgement 5. District Forest Officer, 24 Parganas (South) 6. Kolkata Municipal Corporation 7. Bidhannagar Municipal Corporation 8. Kolkata Port Trust 9. Kolkata Environment Improvement Project 10. Survey of India 11. National Thematic Mapping Organisation 12. India Meteorological Department 13. Census of India 14. Regional Remote Sensing Service Centre (ISRO), Kharagpur We are also thankful to: 1. Sri Pijush Kumar Ghosh, Retired Superintending Engineer, I&W Department 2. Sri Tushar Kanjilal, Member, Sundarban Development Board
Page 4 and 5: Project Team Though the outcome of
Page 6 and 7: Preamble The State of West Bengal,
Page 8 and 9: 1.2 IMD, in its website (http://www
Page 10 and 11: 1.4 5. Proposals for location of cy
Page 12 and 13: 2.2 region is that which struck the
Page 14 and 15: 2.4 Figure 2-2. Track of the 1970 B
Page 16 and 17: 2.6 The most destructive element as
Page 18 and 19: 2.8 the two regions is rather diffe
Page 20 and 21: 2.10 2.4. The eastern coastal zone
Page 22 and 23: 2.12 velocity is first checked. As
Page 24 and 25: 2.14 Strong winds known as cyclones
Page 26 and 27: 2.16 2.4.6. Soil characteristics Th
Page 28 and 29: 2.18 All rivers have in general sou
Page 30 and 31: 2.20 Another interesting feature of
Page 32 and 33: 2.22 formed does not pose so much o
Page 34 and 35: 2.24 2.4.11. Forest composition The
Page 36 and 37: 2.26 Canning (Bidyadhari Outfall in
Page 38 and 39: 2.28 Administrative information Pop
Page 40 and 41: 2.30 Mangrove plantation beyond the
Page 42 and 43: 2.32 A retired embankment of river
Page 44 and 45: 2.34 The beaches are flattened by s
Page 46 and 47: 2.36 of a doiminant tidalbasin of t
Page 48 and 49: 2.38 primary mode is centered on th
Page 50 and 51: 2.40 Aquaculture ponds located betw
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2.42 All the islands are situated w
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2.44 • Transport the water to the
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2.46 The other type of failure may
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2.48 channel floor, some of the riv
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2.50 embankments. Crops and propert
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2.52 2. To reduce the average dista
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3.2 a storm surge caused by a tropi
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3.4 these merchants may have been t
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3.6 Figure 3-1. Map of India during
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3.8 larger volume of sewage and dra
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3.10 receive, at least during the r
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3.12 3.9. Drainage scheme of Dr. B.
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3.14 3.10. CMPO and KMDA (originall
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3.16 Flows are diverted to the loca
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3.18 the Bhangar region through the
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3.20 the ocean level as a result of
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3.22 Table 3-6. Major pumping stati
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3.24 Table 3-9. Drainage basin area
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3.26 will lead to significant impro
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3.28 locks, one at Chitpur and anot
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3.30 Respectively. The discharge of
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3.32 Figure 3-6. The downstream of
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3.34 Figure 3-10 shows the tail end
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3.36
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3.38
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4.2 In US, there is a steady decrea
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4.4 This shows that Orissa (with 10
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4.6 30 25 20 15 10 Severe Cyclone C
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4.8 Table 3: Return periods of cycl
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4.10 Table 5: The number and return
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4.12 work station (the Automated Tr
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4.14 through this trough into the d
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4.16 Mean Low water 1.51 1.39 1.34
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4.18 τx,τy : x and y components o
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4.20 formulation. However, the rete
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4.22 ∂u ~ ∂ ~ ~ ∂ ~ ~ ∂ζ 1
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4.24 Δ p p(r) = p( ∞) − [1+ (r
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4.26 maximum surge for this event w
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4.28 U-Component of Velocity (Surfa
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4.30 ## ## ## #### ### ## ########
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4.32 V-component of Velocity (Surfa
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4.34 U-component of Velocity (Surfa
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## ################################
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4.38 V-Component of velocity (Surfa
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5.2 particular human settlement to
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5.4 The Composite Vulnerability Ind
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5.6 (2004 prices) prevalent in dist
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5.8 Moyna 0.6280 0.1592 0.542286 0.
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5.10 5.4.2. Social infrastructure H
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5.12 Budge-Budge(Part-II) 0.0000 0.
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5.14 secondary and tertiary activit
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5.16 F i Fˆ i ⎛ Total no. of =
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5.18 Table 5-4: Composite Index of
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5.20 M ′ = H M ′′ = I . S whe
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Chapter Six Mitigation Strategies a
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6.3 Beside these differences in lev
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6.5 • to reduce the destructive f
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6.7 6.2.4. Methods of Construction
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6.9 is attached to the structure. T
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6.11 (b) Medium rivers to armour th
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6.13 Likewise, in all the embankmen
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6.15 Figure 6 -5 Figure 6 -6 Figure
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6.17 Benefit cost ratio Area benefi
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6.19 Location and cost of proposed
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6.21 Swaraupnagar Swaraupnagar 100
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6.23 Gobadia Kakdwip Dk Kasiabad &
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6.25 Location and cost of proposed
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6.27 " Jagaddal " 800 6400000 " Jag
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6.29
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6.31
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6.33
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6.35 Figure 6 -11 Figure 6 -12
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6.37 Figure 6 -15 Figure 6 -16
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6.39 Figure 6 -19 6.2.7. Recommenda
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6.41 4. Rajraj Swarup & Ramnagar Ab
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6.43 project. Such sediment deficit
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6.45 paludosa, Rhizophora apiculata
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6.47 15. Ceriops tagal 0.22 0.40 0.
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6.49 shelterbelt (average 100 m wid
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6.51 (assuming land acquisition cos
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6.53 location are missing reducing
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7.2 resulted in large scale waterlo
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7.4 5. No adverse effect in drainin
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7.6 15 LT Panel L.S. 2,200,000 16 I
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7.8 Bagjola, Kestopur and SWF chann
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Executive Cost Summary of Recommend
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References Kanjilal (2005) “Sunde
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“……………….Designingadis
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