lascurain esconference
TRANSCRIPT
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Constructed ecosystem services:
the case of hybrid dunes at Barcelona
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1-Mimicking natural processes on urban dunes
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Last mobile dunes 1980
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1992 the first maritime promenade in Spain with dunes as core element of the landscape treatment
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Transformations due to urbanization & modification of coastal dynamics
1956
Anthropocene!
2015
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1990
2004
2007-16
Disruption of natural longshore sand transport processes
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Increasing flood prone beach areas extending more than 3km
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Marram grass decay after less than 10 years
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Something worrying when is the most relevant dune constructor. We have not found any photograph of dunes without marram grass
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Literature describes competition processes and soil patogens as most relevant factor
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Probably mechanical sieving impedes the natural sand aeolian transport, but is only one of the relevant factors
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The accumulation of dog excreta can also be a problem for a plant which requires oligotrophic soils
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Without marram grass and aeolian sand transport, dune relief disappears. No more bare sand and its biodiversity
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Pine tree encroachment is another factor of dune habitat reduction
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Altered ecosystem but biodiversity still remaining. Still on time to react!
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An European project + the Metropolitan Administration of Barcelona
Goals: 1. Learn how to construct urban dunes2. Learn how to manage the huge demand of cultural ecosystem
services of the urban dunes.
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Socio-cultural and economic processes
Cartographies of intensity of use along the year
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Dune construction from beach sand
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Wind is no more constructing dunes, but …
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.. still keeps its ability to erode dunes and uproot marram grass
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In just 8 weeks marram grass uprooted and invasive species stablished
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Determination of prevailing constructing/eroding winds from historic flights and fieldwork
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Erosion risk can be mapped along dune structures.
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We have developed a new system to transform marram grass plantings in to efficient sand-trapping systems
Marram grass as natural capital (dune builder)
Marram grass as natural capital and core element of a nature based solution
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2-Coastal dynamics & decision chain
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No dunes, no beach!!
When beach width is not enough to provide a comfort strip
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The only official way to protect the coastline is beach nourishment (100,000m3/yr). No long-term strategy
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Sand nourishment has not modified the emerged beach profile which keeps vulnerable to flooding
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Beach nourishment hasn’t stopped erosion processes
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The need of a policy analysis
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A decision environment which is not evidence-based
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A highly hierarchical, authoritative and unchecked decision process
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The most dependent stakeholders without capacity to intervene on the decision-making
process
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Time to think on improving the governance environment
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3- Ecosystem services concept as an explicit management tool
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LIDAR and satellite images has become very precise
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A retraslocation of only 6.000m3 of emerged sand has proved to be much more efficient & effective
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And a previous project done at Calafell (50km south) beach will work at Castelldefels.
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Efficient storm water retention basins
Beautiful landscapes
Biodiversity
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There’s a big chance for a management plan of the emerged sand budget, combining precise LIDAR information, dune construction, beach profile reconstruction and coastal lagoon excavation
A nature-based solution for coastal defence and climate change adaptation.
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An evidence-based management plan that includes a strong social component
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We are modelling scenarios for RCP 2.6 (57cm SLR and 25 m of beach regression, yr 2.100) for the different factors: wahsover risk, erosion, flood events,...
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But adapting fast to much more near ones! (this is Emilia Romagna on Italy last year)
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A nature-based solution to get resilient beaches
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With reliable data from LIDAR yearly flights
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http://maps.croma.org.es/geoserver/www/cr004_visor-ampliat.html
With a Web Map service
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Nature-based solution involving policy analysis, governance, and participated coastal engineering
[email protected]@volemduneshttp://www.operas-project.eu/