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Lascurain esconference


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Presentation to be held 22th september at Anwerp ES Conference

Published in: Environment
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Lascurain esconference

  1. 1. Constructed ecosystem services: the case of hybrid dunes at Barcelona
  2. 2. 1-Mimicking natural processes on urban dunes
  3. 3. Last mobile dunes 1980
  4. 4. 1992 the first maritime promenade in Spain with dunes as core element of the landscape treatment
  5. 5. Transformations due to urbanization & modification of coastal dynamics 1956 Anthropocene! 2015
  6. 6. 1990 2004 2007-16 Disruption of natural longshore sand transport processes
  7. 7. Increasing flood prone beach areas extending more than 3km
  8. 8. Marram grass decay after less than 10 years
  9. 9. Something worrying when is the most relevant dune constructor. We have not found any photograph of dunes without marram grass
  10. 10. Literature describes competition processes and soil patogens as most relevant factor
  11. 11. Probably mechanical sieving impedes the natural sand aeolian transport, but is only one of the relevant factors
  12. 12. The accumulation of dog excreta can also be a problem for a plant which requires oligotrophic soils
  13. 13. Without marram grass and aeolian sand transport, dune relief disappears. No more bare sand and its biodiversity
  14. 14. Pine tree encroachment is another factor of dune habitat reduction
  15. 15. Altered ecosystem but biodiversity still remaining. Still on time to react!
  16. 16. An European project + the Metropolitan Administration of Barcelona Goals: 1. Learn how to construct urban dunes 2. Learn how to manage the huge demand of cultural ecosystem services of the urban dunes.
  17. 17. Socio-cultural and economic processes Cartographies of intensity of use along the year
  18. 18. Dune construction from beach sand
  19. 19. Wind is no more constructing dunes, but …
  20. 20. .. still keeps its ability to erode dunes and uproot marram grass
  21. 21. In just 8 weeks marram grass uprooted and invasive species stablished
  22. 22. Determination of prevailing constructing/eroding winds from historic flights and fieldwork
  23. 23. Erosion risk can be mapped along dune structures.
  24. 24. 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
  25. 25. 2-Coastal dynamics & decision chain
  26. 26. No dunes, no beach!! When beach width is not enough to provide a comfort strip
  27. 27. The only official way to protect the coastline is beach nourishment (100,000m3/yr). No long-term strategy
  28. 28. Sand nourishment has not modified the emerged beach profile which keeps vulnerable to flooding
  29. 29. Beach nourishment hasn’t stopped erosion processes
  30. 30. The need of a policy analysis
  31. 31. A decision environment which is not evidence-based
  32. 32. A highly hierarchical, authoritative and unchecked decision process
  33. 33. The most dependent stakeholders without capacity to intervene on the decision-making process
  34. 34. Time to think on improving the governance environment
  35. 35. 3- Ecosystem services concept as an explicit management tool
  36. 36. LIDAR and satellite images has become very precise
  37. 37. A retraslocation of only 6.000m3 of emerged sand has proved to be much more efficient & effective
  38. 38. And a previous project done at Calafell (50km south) beach will work at Castelldefels.
  39. 39. Efficient storm water retention basins Beautiful landscapes Biodiversity
  40. 40. 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.
  41. 41. An evidence-based management plan that includes a strong social component
  42. 42. 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,...
  43. 43. But adapting fast to much more near ones! (this is Emilia Romagna on Italy last year)
  44. 44. A nature-based solution to get resilient beaches
  45. 45. With reliable data from LIDAR yearly flights
  46. 46. visor-ampliat.html With a Web Map service
  47. 47. Nature-based solution involving policy analysis, governance, and participated coastal engineering @volemdunes