614
(g) Dredging
Dredging is similar to embankment. Presence of dredging in a creek will be
unhealthy – 10
Theme10: Stand Size/Fragmentation of the Stand
It includes the following two components which need to be separately calculated
and the put as an input into the total theme value.
(a) Change in the size of the stand
(b) Percentage of area occupied by saline blanks
Stand Size
It is based on the in mangrove stand size between two time frames. It can be computed using satellite data of two time frame. Values are assigned based on the following criteria:
Change in the size of the stand
No change
100
1–5%
80
5.1–20%
60
20–40%
40
More than 40%
20
Saline Blank
Saline blanks can be mapped using high resolution satellite images supported with
ground truth. The values for this theme are computed on the basis of percent of
saline blanks in a grid, using the following criteria:
Percentage of area occupied by saline blanks
No saline blanks
100
1–5%
80
5.1–20%
60
20–40%
40
More than 40%
20
Theme 11: Changing Vegetation Pattern
The input remains similar to the stand size and the following are the values for the
classes under this theme:
(i) Mangrove to non-mangrove – UH
10
(ii) Mangrove to halophyte – MUH
40
(iii) Halophyte to mangrove – MH
60
(iv) Non-mangrove to mangrove – H
100
(v) No change in mangroves H
100
Ajai and H.B. Chauhan