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Publications
| Journal |
Proceeding |
Abul Basar Mohammad
Baki & Md. Abdul Halim, 2005,
"Computation of Gradually-Varied Flow Profiles by Numerical Methods",
The Journal of NOAMI, Vol.22, No. 1, June 2005.
A B M Baki, M F Bari, M I Haque, M S Masud, A S Khan
and M Marchand, 2007,
“An analysis of upstream withdrawal scenarios using geo-spatial approach in
the Surma-Kushiyara river basin”
International Conference on Past and Future of Water (5th IWHA Conference
Tampere Finland) 2007, 13 – 17 June. (Abstract
Accepted)
MANAGEMENT OF RIVERS FOR INSTREAM REQUIREMENT AND
ECOLOGICAL PROTECTION
Introducing Environmental Flow Assessment in
Bangladesh, Multidisciplinary Collaborative Research
Historically, water resources has been
managed in Bangladesh from supply perspective with an emphasis on maximizing
economic growth from the use of water. Specifically, flood management and
irrigation development have been the main concern without much attention to
low flow and instream flow management. With increased awareness about
environmental issues in 1990s, the focus now has been on year round water
management. Also instream flow requirements are explicitly recognized in the
National Water Policy and National Water Management Plan.
Flow regimes of rivers in Bangladesh have
already been degraded significantly due to human interventions, mainly
upstream withdrawal of water. Ever increasing water resources demand and
utilization in the upper riparian country will increasingly have an effect
on the water availability in the river system of this country as most of the
catchment areas lie outside its territorial limits. There are large-scale
plans for diverting water from the Brahmaputra and Ganges Rivers to the
drought prone areas in India which will not only affect the low flow
conditions but also the seasonal variability of flow will be altered
affecting the entire annual hydrograph. In view of these assessment of
instream/environmental flow has become very urgent. Furthermore, on a local
and regional scale environmental flow requirements are needed for the main
and secondary rivers in which flows are decreasing due to local changes, for
example through water diversion and siltation at off-takes and bifurcation
points.
In Bangladesh no systematic study and
research has been done for defining environmental flow requirements. The
instream requirement set forth in different plans until now has been on ad
hoc and empirical basis. From a river management point of view,
scientifically justified methods and guidelines are needed for determining
flow requirements to safeguard aquatic environment, livelihood of
subsistence users, and requirements of downstream users. In this regard
water management in this country lags behind in the development of
appropriate management models for recommending flow regimes considering
environmental and ecological aspects.
The main objective of this research is
to:
· understand
the issue of instream flow requirements of selected rivers in terms of their
functions and problems, and suggest a suitable methodology for assessing
flow requirements;
· gain
experience in environmental flow assessment methods;
· develop
capacity in multidisciplinary research involving hydrologists, fisheries
biologists, ecologists, academicians, as well as water professionals and
practitioners; and
· suggest
further research needs and steps to establish a comprehensive environmental
flow assessment program.
DEVELOPMENT OF FLOOD MAPS OF THE SURMA-KUSHIYARA
BASIN The study ‘Management
of Rivers for Instream Flow Requirements and Ecological Protection’ of BUET-DUT
Linkage Project concerns environmental flow assessment for three selected
river system of Bangladesh: Surma-Kushiyara, Teesta and Gorai river.
Instream flows sometimes called environmental flows provide the water that
is left in a river eco-system or released into it for specific purpose of
maintaining the condition of the ecosystem. Three types of methods were
selected for environmental flow assessments for this study include
hydrological methods, PHABSIM method, and ecotope method.
The hydrologic methods basically provide
reconnaissance level information regarding IFR and they do not consider the
river functions, characteristics or the problems explicitly. PHABSIM is an
incremental method in the sense that it predicts the changes in fish habitat
resulting from changes in flow. The ecotope method is a new approach for
assessing environmental flow requirements and it enables integration of
river and floodplain ecosystems and their functions. Ecotopes are land units
that are determined by various aspects and processes occurring in the
landscape. The assessment of environmental flows therefore requires an
approach that is broader than the instream flow methods used in most cases.
Flood map of the study area is an integral part of the ecotope method. Flood
maps are generated to identify spatially defined flood characteristics such
as flood frequency and duration. These results are combined with the ecotope
map of the present situation to define the ecotope model.
The main objective of this research is to:
· slection
of scenarios considering proposed Dam and Barrage in the U/S of Barak river;
· dvelopment
of series of flood maps of the Surma-Kushiyara basin for different scenarios
using MIKE GIS and MIKE FLOOD and
· cmparison
of outputs of the MIKE GIS and MIKE FLOOD. |
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Last updated : Tuesday September 19, 2006 |