MINISTRY OF EDUCATION AND TRAINING
MINISTRY OF AGRICULTURE AND RURAL DEVELOPMENT
WATER RESOURCES UNIVERSITY
NGUYEN DINH
RESEARCH ON CHANGES OF SOME HYDRAULIC
AND HYDROLOGICAL FACTORS OF THE HUONG
RIVER SYSTEM’S DOWNSTREAM UNDER THE
IMPACT OF IRRIGATION AND HYDROPOWER
CONSTRUCTIONS AND CLIMATE CHANGE
Specialization: Water resources development
Code: 62 44 92 01
DOCTORAL THESIS SUMMARY
HANOI–2014
Research has been completed at Water Resources University
Science advisors:
Associate Prof. Le DinhThanh
Associate Prof. Hoang Minh Tuyen
Reviewer No.1:
Reviewer No.2:
Reviewer No.3:
Thesis will be defended from university thesis evaluating council of
Water Resources University
At(hour)(day)(month) 2014
Thesis can be found at:
- National Library
- Water Resources University Library
1
INTRODUCTION
The problem statement of thesis: Many irrigation and
hydropower constructions have been built on the Huong river basin,
which have significant impacts on the hydraulic and hydrological
regimes at downstream. Meanwhile climate change also impacts on
water resources in the basin. Therefore the research of thesis
“Research on changes of some hydraulic and hydrological factors of
the Huong river system’s downstream under the impact of irrigation
and hydropower construction and climate change” is necessary,
meeting the demand of socio-economic sustainable development in
the basin, particularly helpful for the activities of restructuring the
agricultural structure and developing Thua Thien Hue Province to be a
municipality.
Purpose of research: Clarifying the change of some
hydrology-hydraulic factors at downstream of Huong river system
under the impacts of irrigation and hydropower constructions and
climate change in order to propose adaptive measures to mitigate the
negative impacts on economic-social development and environmental
protection.
Objects and range of research: Assessing the impacts of
irrigation-hydropower construction system on some hydrology-
hydraulic factors at downstream of Huong river from reservoirs to
Thao Long dam with climate change calculated to the year of 2030.
Research methodology: Thesis has used these methods:
inheriting, investigating, surveying, statistic analysing, hydrology-
hydraulic mathematical modelling, GIS, system analysing, expert
method and community consulting
Summarizing new contributions of the thesis:
1) Assess quantitatively the impact of irrigation -
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hydroelectric power constructions on the Huong river basin and the
impacts of climate change on hydraulic and hydrological factors in
downstream of the Huong river system.
2) Propose structural and non-structural measures to mitigate
the negative impacts of hydropower and irrigation works on the
Huong river basin to flow regime in downstream and improve the
efficient operation of those constructions.
Chapter I
LITERATURE RIVEW
1.1 OVERVIEW OF PREVIOUS RELATED STUDIES
The thesis overviewed 38 related studies in the world,
Vietnam and the Huong river basin.
1.1.1 Research in the world
There are many studies relating to the impact of reservoirs and
climate change on hydrology-hydraulic regime at downstream of
catchments around the world. These focus mainly on catchments
which have large scales and can be divided into two directions: (i)
comparing and analysing environmental changes between the periods
before and after constructions of reservoirs by observed data, and (ii)
Applying hydrological and hydraulic mathematical models to assess
the impacts on flow at downstream.
1.1.2 Research in Vietnam
In Vietnam, the assessment of impacts of constructions and
climate change to flow regime has been concerned recently,
particularly after great irrigations and hydropower constructions were
built on river systems. Studies about impacts of climate change focus
on assessing the change of water resources on watershed without
going further into detailed and quantitative assessment about impacts
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of irrigation and hydropower constructions and climate change on
hydrology-hydraulic factors at downstream of river systems.
1.1.3 Constraints of previous research on Huong river basin
and corrective direction
Previous studies on Huong river basin assessing the impact
individually, while the integrated impact of constructions and climate
change on hydrology-hydraulic regime at downstream is not yet
comprehensive considered. Approaches of these research are not of
systematic and integrated, mostly based on the assumption that the
hydrological condition and ground surface remain unchanged.
Quantitative assessments are still restricted.
Corrective directions of thesis:
- Assessing system analysis perspective of Huong river basin,
concentrating on main structures which have considerable impact on
flow regime at downstream.
- Quantitatively assessing of impacts of constructions and climate
change, initially considering the role of land use and forest layer on
the basis of selecting annual flow and specific flood to study the
change of some typical hydrology-hydraulic factors.
- Proposing measures which are scientific-based, practical,
possible and effective.
1.1.4 Approach of thesis
- Integrated approach following the water system
- Imitative approach by hydrological and hydraulic mathematical
models
- Approach by scenarios