Presentation by Mr. Gazi Md. Riasat Amin (Bangladesh) at the Seminar Hydro Software to support policy development and real-time decision making, during the Deltares Software Days South-East Asia 2019. Wednesday, 27 November 2019, Bangkok.

1. Application of Mathematical Modelling Tools in
Water Resource Management
Gazi Md Riasat Amin
Junior Hydrologist and Climate Expert
Climate Change and Disaster Management Division
Center for Environmental and Geographic Information Services (CEGIS)
Meta Model, Delft3D and SOBEK 2

3. 1991: FAP 19 and
FAP 16
1995: FAP 19 &
FAP 16 merged
to form EGIS
1997:
Formation of
EGIS II
2002:
Formation of
CEGIS
CEGIS is A Public Trust Under the Ministry of Water Resources, Bangladesh
Vision
“The overarching aspiration of CEGIS is to continue its relentless
advances as a center of excellence in providing intellectual services,
policy advocacy, research & capacity development and expanding
its service horizon for sustainable development and enabling better
environment”
Motto
“Safeguarding Environment for Future”
The Organization I Belong to

4. W
Preamble

5. W
Bengal Delta
• The Lower Meghna conveys the
combined flows of the Brahmaputra,
the Ganges and the Upper Meghna.
• The sediment discharge from the
Lower Meghna River is the highest
and the water discharges the third
highest, of all river systems in the
world .
• Erosion and accretion rates are high
and the area is periodically
subjected to severe storms and
cyclones.

6. W
2
Development of 2D Hydrodynamic Bay of
Bengal Model Using Delft3D 4
Development of Quasi 2D Regional
Hydrodynamic Model Using SOBEK 2
3
Todays Topic
1
Development of Bangladesh Metamodel
Joint corporation program – Bangladesh and Netherlands

7. W
Bangladesh Meta Model
Main Goal:
The main goal is to support adaptive delta (IWRM and ICZM) planning
(within SIBDP) by key stakeholders such as the GED, Ministry of Water
Resources and others in investment planning and integrated assessment.
Objective of the Bangladesh Metamodel (from Blue Accounting):
to support the formulation, analysis and evaluation of alternative
management strategies

8. W
Bangladesh Meta Model
• Meta model will be based on existing data, knowledge and
detailed models
• No developments of new data, knowledge and detailed models
• Joint development by Bangladeshi and Dutch experts to ensure
that model can be applied, maintained and extended after the
project
• ‘Ownership’ and roles for organizations will be developed
during the project to ensure sustainability after JCP

9. Bangladesh Meta Model
Iterative development, not starting with detailed
specifications
Version 0.10
June 2019
Version 0.20
December 2019
Version 1.00
March 2020

10. Bangladesh Meta Model

11. Bangladesh Meta Model
Framework
Other
Modules

12. W
Objective
1. To have the essential comprehension of
the hydrodynamic condition in the
coastal zone of Bangladesh which is
highly affected by natural and many
other man-made activities.
2. To generate boundary condition for
small scale model.
2D Hydrodynamic Model Using Delft3D 4
Delft3D-FLOW

13. W
Model Domain:
1. Ganges, Brahmaputra, Upper
Meghna and coastal zone of
Bangladesh .
1. Downstream boundary is about
204km (approx.) away from coastal
floodplain
2D Hydrodynamic Model Using Delft3D 4

14. Grid Size
The model is applied using a single-layer spherical
coordinate system. Curvilinear grid is used for the
discretization. In the ocean, grid size was
approximately 500 m X 600 m and in estuaries the
grid size was approximately 200 X 300 m.
2D Hydrodynamic Model Using Delft3D 4

15. Bathymetry
Cross sectional data for each of the estuaries in the estuarine systems of the GBM delta are collected
from CEGIS Database. Open access General Bathymetric Chart of the Oceans (GEBCO) data is used as the
bathymetry of the Bay of Bengal. The inland ground elevation data is derived from the National Digital
Elevation Model available in CEGIS Database.
2D Hydrodynamic Model Using Delft3D 4

16. Upstream
Downstream
1) Ganges
2) Brahmaputra
3) Upper Meghna
Time series Discharge Data
1) Deep Sea
Time Series Tidal Water Level
derived from Naotide prediction
system (Matsumoto, 2000).
One Downstream Boundary
Three Upstream Boundary
2D Hydrodynamic Model Using Delft3D 4

17. Hiron Point
Khepupara
CoxsBazar
Hiron Point (Monsoon)
Coxsbazar (Dry Season)
2D Hydrodynamic Model Using Delft3D 4
Calibration and Validation

18. Domain Decomposition
Storm Surge Model
Delft Dashboard Interface
Surge Track was
collected from Indian
Meteorological
Department Website

19. Storm Surge Model

20. Bay of Bengal Model in Delft3D FM
Translation of the Developed Bay of Bengal Model on
Delft3D 4 (structured) to Delft3D FM (flexible mesh) is going on

21. Understanding flooding characteristics of
main rivers, major khals etc. in DAP area
Assessment of flooding scenario
considering extreme events, coupled with
DAP estimated urban growth
Formulation of mitigation measures to
address flooding issues
This study covers the assessment of overall
flood hydrology in and around greater
Dhaka city
Quasi 2D Model Using SOBEK 2

22. HD model facilitates to detect:
▪ Flooding characteristics
▪ Drainage pattern
▪ Impact assessment
▪ Mitigation measures formulation
Inundation Before and After Intervention
Quasi 2D Model Using SOBEK 2
Approach of The Model

23. Problems regarding flooding and drainage issues
inside DMA and outer fringe area has been identified
A hydrodynamic and hydrologic model for North
Central Region has been developed
An integrated sub-model for DAP area have been
setup using SOBEK 2
The model is calibrated and validated with observed
data and information
Model has been run for three land use scenarios e.g.
Existing land use, DAP proposed land use and Strategic
land use
Each of the land use scenario has been simulated for
1988, 1998, 2004 and 2009 extreme events
Quasi 2D Model Using SOBEK 2

24. Result Analysis for 1998 and 2004 Flood1998Flood
2004Flood

25. Existing land use DAP 2010-15 land use DSP 2016-35 land use
Kashimpur
National
monument
Ashulia
Uttara
Baghair
National
Parliament
Martyr
Intellectual
Memorial
Hemayetpur
Kalatia
Hazratpur
Fatullah
Kashimpur
National
monument
Ashulia
Uttara
Baghair
National
Parliament
Martyr
Intellectual
Memorial
Hemayetpur
Kalatia
Hazratpur
Fatullah
Kashimpur
National
monument
Ashulia
Uttara
Baghair
National
Parliament
Martyr
Intellectual
Memorial
Hemayetpur
Kalatia
Hazratpur
Fatullah
Flood Free: 62%
Low flooded: 5%
Deeply flooded: 33%
Flood Free: 62%
Low flooded: 14%
Deeply flooded: 24%
Flood Free: 51%
Low Flooded: 5%
Deeply Flooded: 44%
Result Analysis for 1998 Flood

26. Result Analysis for 1998 Flood
Hard Measures Soft Measures
Measures are generally divided into two categories which are
hard and soft.
❑ Conservation of
wetlands
❑ Storm water quantity
control
❑ Institution and capacity
development
❑ Revitalization of khals
❑ Establishment of
connectivity
❑ Provision of buffer zone
or flood passage
❑ Dredging of peripheral
rivers

27. Result Outcome
Preliminary identified
buffer zone or flood
passage
Wetlands must be
conserved in
delineated zone
Turag
Chilai
Bangshi
Buriga
nga
Suti
Sitalakhya
Tongi K hal
B
alu
D
haleswari
Bangshi (Sava
r)
Ichamati (Manikganj)
G
azik
hali
Dhaka
Gazipur
Munshiganj
Narayanganj
Tangail
Savar
Sreepur
Sreenagar
Kaliakair
Keraniganj
Serajdikhan
Gazipur Sadar
Turag
Chilai
Bangshi
Buriga
nga
Suti
Sitalakhya
Tongi K hal
B
alu
D
haleswari
Bangshi (Sava
r)
Ichamati (Manikganj)
G
azik
hali
Dhaka
Gazipur
Munshiganj
Narayanganj
Tangail
Savar
Sreepur
Sreenagar
Kaliakair
Keraniganj
Serajdikhan
Gazipur Sadar

28. THANK
YOU