1. Assessment of Flow Changes from
LOGO
Operations of 41 Dams in the Sekong, Sesan
and Srepok Rivers of the Mekong Basin
Dr. Thanapon Piman and Dr. Tom Cochrane
University of Canterbury
Department of Civil and Natural Resources Engineering
Asia 2012: Water Resources and Renewable Energy Development in Asia
27 Mar 2012, Chiang Mai, Thailand
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2. 3S Basin within the Mekong Basin
A transboundary river basin in
Lao PDR, Cambodia and Viet Nam
Hydropower development is
accelerating: Energy demands
Significant flow contribution to
the Mekong river (17-20%)
An important contribution of
aquatic biodiversity and
ecosystem services: fish,
habitats, and migration routes
About 500,000 people are highly
depend on natural resources and
ecosystem services
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3. Objectives
To assess how existing and future hydropower
development and operation in the 3S rivers can
change flow regimes
To compare changes in flows and water levels in
the Mekong River
Mekong tributaries vs. Mainstream dams: which will
cause greater impact?
To provide strategic options for dam development
and operations in the 3S basin
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4. Simulated scenarios
Levels of hydropower development
2) Baseline scenario (BL)
No dams
5) Definite future scenario (DF)
Existing and under construction dams
8) Development in main tributaries scenario (DMT)
DF plus proposed dams in main tributaries
• Development in main and sub tributaries scenario (DMST)
DMT plus proposed dams in sub tributaries or All dams
4
7. Simulated Dam Operation Scenarios
1. Seasonal Variation: Max. energy
2. Full supply: Ecologically friendly
3. Low Supply: Flood control
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8. Hydrologic modelling
SWAT model (ARCSWAT and
SWAT 2005)
Set up and calibration by
MRC (2010)
Simulation period 1986-2006
Divided into 118 subbasins
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9. Reservoir operation modelling
Hec Ressim model
(Version 3.0)
Set up by UC (2011)
Simulation period 1986-2006
41 dams are modelled
Muskingum Cunge 8 points
routing
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18. Conclusions
7,000
6,000 Present
5,000
1) and Future
Flow
4,000
3,000
2,000
m
w
F
3
o
s
)
(
/
l
1,000
0
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2) 3S dams Chinese dams LMB mainstream dams
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19. Conclusions
3) Site selection, dam operation and
cooperation/coordination are important
4) Further study needs;
Intra-daily flow fluctuation
Sediment flows and dam trapping
Ecosystem and biodiversity impacts
Social and economic impacts
Climate change
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21. Acknowledgements
Mekong River Commission: data and information
The Critical Ecosystem Partnership Fund: a joint
initiative of Conservation International, l’Agence
Française de Développement, the Global Environment
Facility, the Government of Japan, the MacArthur
Foundation and the World Bank. A fundamental goal is
to ensure civil society is engaged in biodiversity
conservation.
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Hinweis der Redaktion
Large storage requirement for relatively small gain amount of energy