376
Table 11.2 (continued)
4
Tidal drainage loss from the matured surface
4.5
3.0
4.0
5
Areas devoid of fresh silt accumulation
3.8
3.2
3.5
6
Episodic tidal waves and encroachment of tide
water in inner island depressions
3.5
3.5
4.0
7
Extensive dry spells in a year
2.0
2.0
2.0
8
Low infiltration rate on the clay pans
2.5
2.5
2.5
Total scores
25.3
19.2
22.0
Sl. No. Sediment deposition:(parameters)
1
Wash over fan lobes on to the mangrove wetlands 3.0
3.0
2.0
2
Roll over process of barrier bars in the inland
areas in the rising sea level
3.0
1.0
1.0
3
Formation of wind-tidal flat by blowing sand
3.0
2.0
1.0
4
Over bank splays at the distributaries flood basin 3.0
2.0
1.0
5
Channel decaying by in-channel siltation
1.0
1.8
1.5
6
Mobility of dune sediments in the inland areas
0.5
2.5
2.0
7
Mass transport of sands with placer minerals in
the storm
0.6
0.8
0.8
8
Rapid siltation on the mud flats with slumping
effects
0.2
0.1
0.1
Total scores
14.3
13.2
9.4
Sl. No. Strom effects: (parameters)
1
Salt water flooding over a time and space
4.0
2.0
4.0
2
Wind damage activities at the magnitude of
storms
2.0
2.0
2.0
3
Fireball activities at the high magnitude storms
0.5
0.5
0.5
4
Storm dispersal of mangrove seeds
4.0
4.0
4.0
5
Storm surge elevation changes
4.5
3.5
3.8
6
Bank instabilities due to undermining the process
by storm waves and currents
1.8
1.5
2.5
7
Sheet erosion and removal of fresh silts from the
swampy tract
1.5
1.5
2.8
8
Increasing storminess with energy stress
3.0
3.0
3.0
Total scores
21.3
18.0
22.6
Sl. No. Land erosion: (parameters)
1
Bank erosion by shifting channels
2.0
3.0
3.0
2
Shoreline erosion by waves and currents
(horizontal)
2.0
4.0
3.0
3
Significant cliffing along the shores (vertical
erosion)
0.5
2.0
1.0
4
Spurs and furrows along and across the mud
banks
0.5
1.0
2.0
5
Erosion protection measures by engineering
structures
0.5
2.0
0.5
(continued)
A.K. Paul et al.
Table 11.2 (continued)
4
Tidal drainage loss from the matured surface
4.5
3.0
4.0
5
Areas devoid of fresh silt accumulation
3.8
3.2
3.5
6
Episodic tidal waves and encroachment of tide
water in inner island depressions
3.5
3.5
4.0
7
Extensive dry spells in a year
2.0
2.0
2.0
8
Low infiltration rate on the clay pans
2.5
2.5
2.5
Total scores
25.3
19.2
22.0
Sl. No. Sediment deposition:(parameters)
1
Wash over fan lobes on to the mangrove wetlands 3.0
3.0
2.0
2
Roll over process of barrier bars in the inland
areas in the rising sea level
3.0
1.0
1.0
3
Formation of wind-tidal flat by blowing sand
3.0
2.0
1.0
4
Over bank splays at the distributaries flood basin 3.0
2.0
1.0
5
Channel decaying by in-channel siltation
1.0
1.8
1.5
6
Mobility of dune sediments in the inland areas
0.5
2.5
2.0
7
Mass transport of sands with placer minerals in
the storm
0.6
0.8
0.8
8
Rapid siltation on the mud flats with slumping
effects
0.2
0.1
0.1
Total scores
14.3
13.2
9.4
Sl. No. Strom effects: (parameters)
1
Salt water flooding over a time and space
4.0
2.0
4.0
2
Wind damage activities at the magnitude of
storms
2.0
2.0
2.0
3
Fireball activities at the high magnitude storms
0.5
0.5
0.5
4
Storm dispersal of mangrove seeds
4.0
4.0
4.0
5
Storm surge elevation changes
4.5
3.5
3.8
6
Bank instabilities due to undermining the process
by storm waves and currents
1.8
1.5
2.5
7
Sheet erosion and removal of fresh silts from the
swampy tract
1.5
1.5
2.8
8
Increasing storminess with energy stress
3.0
3.0
3.0
Total scores
21.3
18.0
22.6
Sl. No. Land erosion: (parameters)
1
Bank erosion by shifting channels
2.0
3.0
3.0
2
Shoreline erosion by waves and currents
(horizontal)
2.0
4.0
3.0
3
Significant cliffing along the shores (vertical
erosion)
0.5
2.0
1.0
4
Spurs and furrows along and across the mud
banks
0.5
1.0
2.0
5
Erosion protection measures by engineering
structures
0.5
2.0
0.5
(continued)
A.K. Paul et al.