MINISTRY OF EDUCATION
AND TRAINING
MINISTRY OF AGRICULTURE
AND RURAL DEVELOPMENT
THUY LOI UNIVERSITY
VU THI MINH HUE
RESEARCH ON WATER ACCUMULATION
OPERATING MODE IN FLOOD SEASON FOR HOA
BINH AND SON LA TERRACED HYDROELECTRIC
RESERVOIRS
DISSERTATION ABSTRACT
Specialization: Water resource development
Code: 62 44 92 01
HA NOI, 2017
The project is completed at Thuy Loi University
Principle advisor 1: Associate Professor Pham Thi Huong Lan
Principle advisor 2: Professor Ha Van Khoi
Review 01: Associate Professor Nguyen Tien Giang
Review 02: Associate Professor Duong Van Tien
Review 03: Associate Professor Vu Minh Cat
The thesis will be defended in front of Thesis Evaluation Council at
…………………………………………………………………………….
At...……… on …….….…. 2017
The Thesis can be studied at libraries below:
- National Library
- Water Resources University library
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PREFACE
1. The urgency of subject
Currently there are many multi-functional water reservoir projects on the
upstream area of Da river. They contribute a large proportion of hydroelectric
power output, provide water for economic development in Red river delta and
help regulate downstream flood control with extremely high efficiency. Son La
and Hoa Binh reservoirs are two lakes with highest capacity for downstream
flood control (7 billion m3) which are designed to be below normal tide rising
level. Therefore, there are severe conflicts between anti-flood mission and
electricity generation, water provision.
Inter-reservoir operation regulations on Red river basin issued on Decision no
1622/QĐ-TTg on September 17th, 2015 formed a official operation frame.
However, actual operation must be based on predictions on the process of water
running into the reservoirs. Nonetheless, two practical questions for researches
to solve are:
- Is it allowed that the mentioned above reservoirs can accumulate water
in the beginning of flood season? If so, how are water accumulation
regulations formed to ensure downstream anti-flood safety?
- According to the regulations, in late flood phase the reservoirs must
accumulate water up to normal water rising level. However, when
expected big floods occur, how can reservoirs function in order to
decrease downstream flood and ensure construction safety at the same
time?
Therefore, the research student chose the subject “Research on water
accumulation operating mode in flood season for Hoa Binh and Son La
terraced hydroelectric reservoirs”, hoping to study scientific foundation on
water accumulation operating mode in Hoa Binh and Son La reservoirs to
increase water accumulation efficiency for electricity generation and water
provision, ensure construction safety as well as downstream flood prevention.
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2. Mission of thesis
- Research on scientific and practical basis to identify water
accumulation operating mode in flood season, ensure safety in full
water accumulation for reservoirs, increase water provision and
electricity efficiency and at the same time assure safety for downstream
flood and construction flood in Hoa Binh and Son La reservoirs.
- Research on operating mode of downstream flood restriction in late
flood period when Son La and Hoa Binh reservoirs are allowed to
accumulate full water, minimize negative impact on downstream area
in case unexpected big floods occur.
3. Object and scope of the study
Scope of the research: operation and regulation on water accumulation and
flood prevention for terraced water reservoir system of Hoa Binh and Son La in
flood season.
Object of the research: downstream flood prevention regulation is considered in
the inter-reservoir system which comprises of 4 reservoirs - Hoa Binh, Son La,
Tuyen Quang and Thac Ba. However, research on water accumulation
operating mode as the topic object focuses on Son La and Hoa Binh reservoirs
on Da river.
4. Research method
Methods used in the research are (i) Inheritance method; (ii) Integrated analysis
method; (iii) Mathematic model method.
5. New contribution of the thesis
- Propose early conditional water accumulation mode for Hoa Binh and
Son La reservoirs. From that foundation, propose scientific basis to
identify above water level limit of water accumulation process of Son
La reservoirs in limited water accumulation period, to ensure efficient
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water accumulation as well as downstream and construction flood
prevention safety.
- Propose regulation operation mode to prevent flood in downstream
region and coping methods in case unexpected floods occur in full
reservoir water accumulation at the end of flood period.
6. Structure of the thesis
The thesis consists of 118 pages, 30 tables, 40 figures and 67 reference
materials. Aside from the introduction and conclusion, the thesis has 3 chapters:
Chapter 1: Overview of researches on multi-functional reservoir operation.
Chapter 2: Scientific and practical basis to identify water accumulation
operation mode in flood season in Hoa Binh and Son La reservoir system.
Chapter 3: Research results on operation mode in water accumulation period of
Hoa Binh and Son La terraced reservoirs.
CHAPTER 1 OVERVIEW OF RESEARCHES ON MULTI-
FUNCTIONAL RESERVOIR OPERATION
Reservoir and reservoir operation 1.1
To utilize integrated reservoirs for optimal benefit, scientists in the world focus
to find out suitable operation rules, resolve conflicts among different objectives
to reach higher operation efficiency. Those researches range from Rippl’s work
on simplifying water storage (1883) to recent complex researches on optimal
reservoir operation in real time for multiple purposes of Mehdipour and nnk
(2012). Despite systematic and specific research efforts from different
investment organizations and various methods applied by scientists to form
operation rules for reservoir system, successful applications are mostly related
to typical features of each system. There is no common methodology and tool
that can be applied for all systems.