Session4.2 montan aqua_emmanuel reynard
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Transcript of Session4.2 montan aqua_emmanuel reynard
Integrated water management at the
regional scale in a context of climate
uncertainty. The project MontanAqua
Emmanuel REYNARD
Institute of Geography, University of Lausanne
Projektteam:
WP1: Karl Herweg, Martin Hölzle, Matthias Huss, Martina Kauzlaric, Hanspeter Liniger, Emmanuel
Rey, Bruno Schädler (Uni Bern, Uni Fribourg)
WP2: Mariano Bonrisposi, Emmanuel Reynard (Uni Lausanne)
WP3: Olivier Graefe, Christine Homewood (Uni Fribourg)
SP: Stephan Rist, Flurina Schneider (Uni Bern)
Gestion durable de l’eau
Programme nationale de recherche PNR61
The Alps = Water tower of Europe
Viviroli & Weingartner (2004), in Hydrology and Earth System Sciences
Dry areas in the Alps
Mean summer precipitations © Swiss Hydrological Atlas
socio-
economic and
political system
different
users water resources
water availability
in space and time
climate (change)
The project MontanAqua (2010-2013)
WP 3
WP 2
WP 1
Synthesis package
The project MontanAqua (2010-2013)
The study area
South-facing slopes in the Valais
500 m to 3000 m asl.
11 municipalities, 36‘500 inhabitants
760‘000 tourist nights per year
Pictures: E. Rey, 2011
Tseuzier dam and artificial lake Picture: E. Reynard, 2010
Capacity: 51 million cubic meters
High demographic dynamic
Bonriposi 2011
Conceptualisation of the water system
Water availability
today, 2050
Catchments (headwaters)
Clusters of communes
Icogne Montana
Lens Chermignon
Randogne Mollens
Venthône Miège
Veyras Sierre
Water consumption
today, 2050
Water management
today, 2050
St-
Léonard
Conceptualisation of the water system
Schneider, 2012
Preliminary results: the Plaine Morte glacier
Sierre (500 m asl.)
Montana (1500 m asl.)
Plaine Morte glacier (2800 m asl.)
Role of the glacier in a region approaching water stress?
Ru
no
ff (m
io m
3/y
r)
“Additional
” water to
the region?
Runoff from
Plaine-Morte region
© Schweizer Flugwaffe
BE
VS
Huess, 2012
UNIBE
Preliminary results: karstic system
Contribution: some mio. m3/yr, cf. water consumption approx. 10 mio. m3/yr
EO - Eosin
UR -Uranin
Tzeusier lake - Loquesse
Simme - Lenk
UNIBE
Preliminary results: hydrology
Contribution: some mio. m3/yr (cf. water consumption 10 mio m3/yr)
1. Annual precipitation is 3 to 4
times higher than at Montana
station
2. Significant contribution of glacial
melt-water (until 2060)
3. Tseuzier storage lake: key
element for the management of
the (abundant) water
Water tower of the
MontanAqua region!
Bonriposi, 2012
Preliminary results: water uses
Drinking water is partly used for irrigation
Irrigation: no data available Water need was modelled (however,
calculated volume is smaller than the effective water volume transported in
the bisses)
No common view at the regional scale and difficulty to obtain some data
P [mm] from March to October
Ag
ricu
ltu
ral
wate
r n
eed
[m
3]
2010 Tem
p
[°C
]
P [
cm
]
W
ate
r
u
se [
m3]
1 mio m3
Drinking water
Water need for
irrigation Artificial snow
Preliminary results: hydropower production
Filling of Tseuzier lake (Potential) competition between
different users particularly in time
of shortage
A
A
B Hydro power production has priority. Other water users have
to pay the market price for
electricity
when using water from the lake
B
In the future:
Potential for a multi
purpose storage
Wi Su
Bonriposi, 2012
Preliminary results: socio-political system
Homewood, 2012
- Hypothesis 1 ( past, today): The institutional and political
fragmentation has not been a problem because of the almost
unlimited availability of water (TRUE)
- Hypothesis 2 ( future): The system is changing from supply-
oriented management to demand management and from a
fragmented system to an integrated management system
(partly TRUE)
- The Tseuzier lake, the useful storage capacity of which exceeds
the present day water use by 5 times, offers as multi purpose
storage an interesting opportunity for the water management in
the future.
Scenarios for the future (2050)
Water availability
today, 2050
catchments
Icogne Montana
Lens Chermignon
Randogne Mollens
Venthône Miège
Veyras Sierre
Water consumption
today, 2050
Water management
today, 2050
3 Visions (scenarios)
- expansion
- optimisation
- Moderate development
by Group RegiEau
Emission scenario
A1B
- different realisations
Outlook
Tseuzier storage lake is situated in
the middle of the water tower;
concession until 2037
Key element to satisfy all needs:
• From single to multi purpose storage
• How?
• Process of negotiation between different stakeholders: water
users, communes, power company
• Management / priorities in times of shortages
Interesting case study for a quite frequent situation in the future (cf. also new
lakes)