Mu Xiangpeng, China Institute of Water Resources and Hydropower Research, CEWP 2017, Outlook for Partnership Instruments, Friday, 22 September

1. China Institute of Water Resources and Hydropower Research
Mu XiangpengMu Xiangpeng
Sep 22Sep 22 ，， 20172017
The Partnership Instrument ： Water Management and Ecological Security Area

2. 1. Water Ecosystem Challenge in China1. Water Ecosystem Challenge in China
2. Water Ecosystem Problems in the Pilot Area2. Water Ecosystem Problems in the Pilot Area
3. Research Progress and Limitation3. Research Progress and Limitation
•Activity AimsActivity Aims
•The Tasks and Tentative IdeasThe Tasks and Tentative Ideas
Overview of ContentsOverview of Contents

3. China is rich in water ecological resources.
The total length is 1.508
million km The total surface area is
70,800 square kilometers
1. Water Ecosystem Challenge in China

4. Like other countries, China has also encountered the difficult
problem of environmental degradation with economic
development. River ecosystem of China is facing
unprecedented challenges.
Water has become a prominent bottleneck restricting the sustainable
development of economy and society.
1. Water Ecosystem Challenge in China

5. 2. Water Ecosystem Problems
in the Pilot Area
 The Pilot Area of River Ecosystem RestorationThe Pilot Area of River Ecosystem Restoration: Nanxi River basin,
located at the north bank of the lower reaches of Oujiang River,
Southeast Zhejiang Province, Eastern China.
 The basin shape is like tree branches, the basin area is 2436 km2 and
the length of mainstream is 142 km.
 The problems of ecosystem in this basin are representative.
Nanxi River Basin

6. Ayu is the rare fish species in Nanxi River, but population declined
seriously.
Adult fish
Juvenile fish
Problem 1
The destructions above have been banned ， But overwintering
ground and spawning ground of Ayu have been destroyed.
Spawning Ground
Overwintering
Ground
2. Water Ecosystem Problems
in the Pilot Area

7. At present, a sluice has been built on the
Nanxi River, and a reservoir is being built
for flood control and water supply.
Restoration tasks
南岸水库南岸水库
引水闸引水闸
Problem 2
The migration passage has been
cut off by the sluice
Problem 3
The hydrological process has
been changed by the reservoir
2. Water Ecosystem Problems
in the Pilot Area

8. （ 1 ） The life cycle and habitats
distribution of Ayu are investigated,
and appropriate hydraulic
parameters are obtained of spawning
ground.
Hydraulic
Parameters
Appropriate
Range
Depth /m 0.5 ～ 1.0
Flow Velocity /m·s-1
0.43 ～ 1.07
Froude Number 0.19 ～ 0.48
Provide a reference for spawning
ground restoration, and more
parameters need to be studied.
3. Research Progress and Limitation
Migrationperiod
(Mar-May)
Spawning period
(Sep - Oct)
Fattening period
(Jun - Aug)
Catadromous
migrationperiod
(Nov-Dec)
Overwintering
period
(Jan - Feb)
Life cycle of ayu in study area
Oujiang
NanxiRiver
Nanan
Reservoir
The Sluice
estuary area

9. （ 2 ） The relationship between the river discharge and the spawning
ground was studied and ecological flow was calculated preliminarily.
the area and distribution of spawning ground under different discharge
Cross
section
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
upstream 3.5 4.0 5.9 7.2 7.5 13.6 9.4 8.4 8.2 6.4 5.6 5.5
downstream 4.7 6.5 11.5 14.6 15.1 24.6 16.3 14.8 17.9 9.3 7.5 6.7
Ecological flows of Nanxi River based on Appropriate hydraulic parameters for ayu (m3
/s)
10m3
/s 25m3
/s 50 m3
/s 75 m3
/s 100m3
/s
A more accurate and detailed ecological scheduling scheme will rely on
the further study on critical hydrological conditions for the habitats
3. Research Progress and Limitation

10. （ 3 ） According to the swimming ability of Ayu, a fishway has been
built on the left side of the sluice in Naxi River.
Counts and classification at the fishway have not been
implemented, so the evaluation and optimization of fishway can
not be carried out.
3. Research Progress and Limitation

11. 4 Activity Aims
 to promote the exchange of experiences of river restoration between
Europe and China that have been implemented in Europe following
WFD driver. Good practices carried out in Rio Mondego, Rhine River
and Austrian experience and techniques will be transferred to protect
natural fish in Nanxi River basin.
Activity Aims
 Pilot project targeted to river continuity problems and species of
economic and biological concern in Nanxi River basin
Activity title
The Partnership Instrument: Water Management and
Ecological Security Area—Pilot cooperation projects and exchange of
experience

12. 5 The Tasks and Tentative Ideas
 Legal and governance framework regarding watershed management.
 Impacting and driving factors for water quality and biodiversity.
Task 1 ： Collection of base information regarding Nanxi basin
 Two workshop sessions will be done each year with local government
(organised by Chinese partners).
Task 2 ： generation of policy recommendations
 Development of monitoring plan and application of surveys methods
of WFD (including hydromorphology, macrophytes, water quality;
macro-invertebrates; fish, birds).
 Open to other CEWP co-lead partners.
Task 3 ： Training sessions for Chinese partners

13.  Water Quality survey (Waters of Portugal); hydro morphology survey
(IBLB); fish survey( including fishway monitoring and to introduce
advanced monitoring technology); macroinvertebrates survey;
macrophytes survey and bird survey.
Task 4 ： Identification of fish population constraints and habitat
preferences
 Considering the pressures and key factors of natural fish population,
diversity and ecosystem services.
 To pay attention to the extensibility of deliverable.
 Through the cooperation study, not only research methods and
restoration measures will be put forward, but also a green
development model of water resources need to be established, which
can all be extended to other basins.
Task 5 ： Natural fish population restoration plan for Nanxi basin
5 The Tasks and Tentative Ideas

14. China Institute of Water Resources and Hydropower Research