Discussion with staff of the Stockholm Environmental Institute about 'controlled flooding' as visible in several deltas of the world, and its potential contribution of building resilience to social-ecological delta systems
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Controlled flooding in social-ecological delta systems - @SEI
1. Controlled flooding in the delta
Martijn van Staveren
PhD candidate @ Environmental Policy Group, Wageningen University
Visiting researcher to Stockholm Environmental Institute, 2015
4-9-2015
2. Outline
Why are we here & acknowledgements
Introduction & objective of the presentation
Into deltas – and trends in delta/flood management
Topics for discussion
Questions/discussion
3. Introduction: research project
Funding: NWO, carried out by Wageningen UR, UNESCO-
IHE and partners working in the deltas
Timeframe: 2012 – 2017 (0,8 fte)
Domain: Environmental Policy
Formal research objective: understanding socio-political
drivers of controlled flooding initiatives, and asses their
potential contribution to building delta resilience
Personal fascination: the ‘place’ of floods in delta
histories and futures/(un)controlled flooding
Approach: STS (Science and Technology Studies)/policy
Objective: present work and have a discussion about
three themes
4. Into deltas: opportunities and
challenges
Flood
management
Urbanization
Various
interests
Climate
change
Institutional
complexity
6. Four trends in delta/flood management
policy
1. Ecosystem-based approaches to water/floods
2. Interest in ‘long term delta planning’ in delta flood
management
3. Flood dynamics restoration emerges in several deltas
4. New conceptualizations of deltas (topic for discussion)
Diving into controlled flooding:
Understanding socio-political drivers of
these initiatives, and asses their potential
contribution to building delta resilience
7. Trend #1: Ecosystem-based approaches
to water/floods
Concerns about environmental impact of engineering
Driven by eco-’inspired’ engineers
Mixed responses from ‘traditional’ engineering (+/-)
Presented as innovation (but not always that new)
8. Trend #2: interest in ‘long term delta
planning’ in delta flood management
Thinking in longer time scales (i.e. 100 years)
To some extent parachuting Dutch delta planning
concepts in other context...
Limited historical awareness (existing engineering
works/past plans)
Who’s delta? Stakeholders, participation and decision-
making
9. Trend #3: Flood dynamics restoration
emerges in several deltas
Restoring or preserving (tidal) flood dynamics
Different drivers (e.g. top down ‘hydrocracy’ vs local
action)
Social shaping of technology (design and ‘operations’)
Place in and contribution to long term delta survival?
11. Topics for discussion
1. Conceptualizing deltas – as complex social-ecological
systems, in which interaction is mediated via hydraulic
engineering?
2. Dealing with flood management in deltas – e.g. a new
perspective on sedimentation processes?
3. Building long term delta resilience with controlled
flooding (and sedimentation)?
12. Trend #4 and discussion point #1: new
attempts to conceptualize/define deltas
14. One type: deltas as social-ecological
systems
Approach seems a good fit to environmental dynamics
and social responses (i.e. interaction) to them in deltas,
and brings in resilience thinking.
But what about
● ... how this interaction actually takes shape in practice?
● ... the role of hydraulic engineering in shaping how deltas
evolve towards the future?
(Conceptual) lessons can be learned from socio-technical
systems research, which has delivered several studies on
the hydraulic engineering works.
15. Socio-technical research on hydraulic
engineering
Provides some ‘new’ concepts e.g.
● technological lock-in
● path dependency
● technological trajectories following technological (in this case
hydraulic) actions -> understanding the development of delta
by means of delta trajectories
● (eco-)technological add-ons which offer some flexibility in
hydraulic works’ operation or functioning
Existing hydraulic works act as ‘system attractors’ ->
needs to be taken into account when talking about delta
futures
Historically informed analyses of technological systems
Provides a basis to identify unsustainable or undesirable
system trajectories (partly a political endeavour)
16. Path dependency (storm surge barrier)
Oosterschelde storm surge
barrier: 2 billion euros
Paradigm: promised to provide
flood protection ‘forever’
following a large scale flood
disaster in 1953
Lifespan 200 years
Despite sluice gates,
environmental consequences,
addressed as second order
effects since TINA
Removal ‘out of the question’
(Province/Ministry/society)
17. Technological lock-in (embankments)
Low embankments in the past (14th century)
More attractive to heighten due to past investments and
earlier efforts, than to chose for other approaches. Also
‘mentally’.
Century-long cycles of embankment heightening
Difference river/land in some places up to 8 (!) meters
18. How to approach deltas (proposed)
As social-ecological systems, in which interaction is
‘mediated’ via hydraulic engineering. Social-ecological-
technological system?
Deltas develop over time dynamically, moving within a
range of relative ‘stability’ unless too little or too much
water tips the system towards another regime
Flood dynamics and sedimentation processes are
inherent to a ‘stable’ delta system
Managing for change via (eco-)technological add-ons
Argued in Van Staveren and van Tatenhove (in review
with Ecology&Society, to be resubmitted Sept 2015)
19. Discussion point #2: a new
perspective on sedimentation
processes?
In the Netherlands: controlled flooding in the
Noordwaard de-poldering indicate tight control of both
water flows and sediment processes
In Bangladesh, tidal polders are filled up with sediment,
but not primarily to increase land height
In other parts of the world (e.g. the Mekong delta coast,
Indonesia) mangroves are specifically planted to catch
floating sediment particles for coastal improvement
Therefore, some indicative/associated developments, but
not spot-on -> your experiences?
20. Discussion point #3: flood/delta
resilience
Many definitions, etc
Rockström et al (2014)’s
interpretation of system’s
resilience:
1. Capacity to absorb
disturbances/shocks
2. (learning) adaptability to
stressors while maintaining
a certain system state
3. Transformability after
crossing threshold
But...
21. Discussion point #3: flood/delta
resilience
Distinction between water/flood/delta resilience
(resilience of delta inhabitants in the face of extreme
floods) and delta resilience (resilience of the social-
ecological delta in the face environmental (broader than
floods!) dynamics)
Water resilience (control - state - driving variable)
Flood resilience (society resilient in the face of extreme
floods – which doesn’t necessarily preventing all
floods). Short term small floods contribute to building
long term flood resilience?
Delta resilience. Integrity of the social-ecological delta
system, in providing delta/ecosystem services to
humans.
22. Back to topics for discussion
1. Conceptualizing deltas – as complex social-ecological
systems, in which interaction is mediated via hydraulic
engineering?
2. Dealing with flood management in deltas – a new
perspective on sedimentation processes?
3. Building long term delta resilience (for humans and the
dynamic environmental of the delta) with controlled
flooding (and sedimentation)?
23. Thank you for your time & attention!
More information:
www.wageningenur.nl/enp
martijnvanstaveren.blogspot.nl
Van Staveren M.F., Warner J.F., van Tatenhove J.P.M., Wester P. 2014.
Let’s bring in the floods. Controlled flooding as a strategy for long term
delta survival? Water International,
http://dx.doi.org/10.1080/02508060.2014.957510.
Van Staveren M.F., van Tatenhove J.P.M. (in review with Ecology&Society,
to be resubmitted Sept 2015). Deltas as social-ecological systems and
the role of hydraulic engineering in (re-)shaping delta trajectories