Mapping Resource Profiles in the Ganges Coastal Zone

Andy Nelson: International Rice Research InstituteManirul Haque: Institute of Water ModellingAhsan Habib: Local Government Engineering DepartmentMoqbul Hossain: Soil Resource Development Institute

IRRI IWM LGED SRDI

Coastal poldersG1 IRRI – IWM – LGED - SRDI

OutputsG1 IRRI – IWM – LGED - SRDI

Focus on brackish-water coastal zones, where agricultural lands face salinity in the dry season > 5 ppt.

The challenge relates to innovations in water governance, improved availability of dry-season water, improved practices for managing salt-affected lands, and intensification and diversification of farming systems.

How can spatial analysis play a role in this basin challenge?

Basin ChallengeG1 IRRI – IWM – LGED - SRDI

-Geodatabase of the coastal zone

-Characterisation of test sites/polders

-Extrapolation domains of technologies and policies

-Land use plans under future hydrological scenarios

Spatial analysis and dataG1 IRRI – IWM – LGED - SRDI

West Bengal Bangladesh

BRRI Barisal

Polder 43/2/F trials

Polder 30 trials andstudy watershed

Polder 3 trials

North 24 Parganas

South 24 Parganas

Trial sites in the coastal zone of Bangladesh and West Bengal

Trial sitesG1 IRRI – IWM – LGED - SRDI

G1 IRRI – IWM – LGED - SRDI Example site location

Polder 3Sehara, Satkhira88.99E, 22.52N

100m

Leveraging detailed dataG1 IRRI – IWM – LGED - SRDI

G1 IRRI – IWM – LGED - SRDI Leveraging detailed data

G1 IRRI – IWM – LGED - SRDI Water salinity monitoring

G1 IRRI – IWM – LGED - SRDI

8-Jun

12-Jun

16-Jun

20-Jun

24-Jun

28-Jun

2-Jul

6-Jul

10-Jul

14-Jul

18-Jul

22-Jul

26-Jul

30-Jul

3-Aug

7-Aug

11-Aug

15-Aug

19-Aug

23-Aug

27-Aug

31-Aug

4-Sep

8-Sep

12-Sep

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

Polder 3 (Station-3, Habra Khal)

Date

Sal

init

y (p

pt)

POLDER-3

2-Jul

6-Jul

10-Jul

14-Jul

18-Jul

22-Jul

26-Jul

30-Jul

3-Aug

7-Aug

11-Aug

15-Aug

19-Aug

23-Aug

27-Aug

31-Aug

4-Sep

8-Sep

12-Sep

16-Sep0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0 Polder 3 (Station-5, Kanjia)

Date

Sa

linit

y (

pp

t)

8-Jun

12-Jun

16-Jun

20-Jun

24-Jun

28-Jun

2-Jul

6-Jul

10-Jul

14-Jul

18-Jul

22-Jul

26-Jul

30-Jul

3-Aug

7-Aug

11-Aug

15-Aug

19-Aug

23-Aug

27-Aug

31-Aug

4-Sep

8-Sep

12-Sep

16-Sep0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0Polder 3 (Station-1, Ichamoti River)

Date

Sa

linit

y (

pp

t)

2-Jul

4-Jul

6-Jul

8-Jul

10-Jul

12-Jul

14-Jul

16-Jul

18-Jul

20-Jul

22-Jul

24-Jul

26-Jul

28-Jul

30-Jul

1-Aug

3-Aug

5-Aug

7-Aug

9-Aug

11-Aug

13-Aug

15-Aug

17-Aug

19-Aug

21-Aug

23-Aug

25-Aug

27-Aug

29-Aug

31-Aug

2-Sep

4-Sep

6-Sep

8-Sep

10-Sep

12-Sep

14-Sep

16-Sep0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0 Polder 3 (Station-5, Kanjia)

Date

Sa

linit

y (

pp

t)

8-Jun

12-Jun

16-Jun

20-Jun

24-Jun

28-Jun

2-Jul

6-Jul

10-Jul

14-Jul

18-Jul

22-Jul

26-Jul

30-Jul

3-Aug

7-Aug

11-Aug

15-Aug

19-Aug

23-Aug

27-Aug

31-Aug0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

22.0

24.0

Polder 3 (Station-2, Ichamoti river)

Date

Sa

linit

y (

pp

t)

G1 IRRI – IWM – LGED - SRDI Cropping patterns

0

0.1

0.2

0.3

0.4

0.5

0.6

NDVI

NDWI7

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

NDVI

NDWI7

Polder 43/2f – moderate to low salinity

Polder 3 – highly saline

Veg

eta

tion

an

d W

ate

r in

dex

Veg

eta

tion

an

d W

ate

r in

dex

G1 IRRI – IWM – LGED - SRDI

Polder land use patterns

Complex seasonal patternsBoro rice (2009-10)Area: 5,011,634 ha

Aus rice (2010-11)Area: 1,103,738 ha

Aman rice (2010-11)Area: 5,816,240 ha

G1 IRRI – IWM – LGED - SRDI

2%

31%

22%

39%

6%

Rice

Rice/Other

Rice/Rice

Rice/Rice/Other

Rice/Rice/Rice

Thank you

G1 IRRI – IWM – LGED - SRDI