Ramon Vallejo
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Transcript of Ramon Vallejo
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Gavà-Dunes Restoration Project
Carme Bladé, Josep Lascurain & Ramon Vallejo
Management of Metropolitan Dune Ecosystems, 15 November 2010
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Pine plantations early 20th century: dune stabilisationReduction of sediment discharge in the Llobregat deltaPeriurban development – secondary housing - tourismModification of marine currents – coast infraestructuresSea pollution: marine spray impacts
Gavamar
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Second project 1998-2000 CENTRAL MARFirst project 1991-1992 LES MARINES Gavamar
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1949
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A short fore dune system
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But a good diversity in grey dunes
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First Project: The construction of the promenade 1990-1992 A small transformation
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1991
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1991
Ammophila arenaria transplantation
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1990
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2010
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1992
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2010
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1961
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2006
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Vegetated dune area also increased
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ALBATROS camp site 1984
GAVÀ CENTRAL MAR
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Compensation
Rehabilitation
Coastal
ecosystems
Campsite
Semi-natural ecosystem + Promenade
The project
N. Abad, 2000
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Fuente: www.gavamar.com
Gavà Mar beach 1989
The second project 1998-2000: Continuation ot the promenade on the old campsite
Specific problems- Flat topography- Alloctonous soil (fine textured, stony)- Lack of characteristic dune species- Dominance of ruderals & ornamentals
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Impact of polluted marine aerosol
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Movingsands
Fixed dunes
Interdunardepression
Tamarix woodlands
Sclerophyllous shrublands& juniper and pine woodlands
The technical project
• Elimination of alloctonous soil• Creation of dune topography using underlying sand• (Construction of the promenade pathways)• Sand traps on the front dune• Plantation and seeding of dune species• (short-term monitoring)
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Ammophila arenaria
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Gavà Mar in 2000: Restoration project finished
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1986
1961
19862006
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Good stablishment of most of dune species ….
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2004
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With the exception of most shrubs and trees
April 2004
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Pistacia lentiscus
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March 2009
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Juniperus macrocarpa
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Rosmarinus officinalis
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Tamarix africana
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Few Ammophila arenaria remainingMay 2010
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March 2009
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Beach cleaning
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Fore dune fixation by the pavement
Feb. 2010
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Exotic species
species hábitat frequencyaverage
cover
Carpobrotusedulis
indward 1/14 62.5 %
Arcthotecacalendula
windward, crest andleeward
3/14 30. 4 %
Oenotherabiennis
depression 3/12 37.5 %
Cortaderiasellonana
depression 6/12 32.5 %
species hábitat frequencyaverage
cover
Carpobrotusedulis
indward 1/14 62.5 %
Arcthotecacalendula
windward, crest andleeward
3/14 30. 4 %
Oenotherabiennis
depression 3/12 37.5 %
Cortaderiasellonana
depression 6/12 32.5 %
M. C.de Araujo, 2010
windward
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Ruderals still there, May 2010
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RUDERALIZATIONbutPositive visitors’ perception of the dune ecosystems in the promenade
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Certainties and uncertainties
• To some extent: learning by doing
⇒ Adaptive restoration required
• Public awareness and involvement are critical components of restoration– Especially in perurban, highly used areas
• What doing next? – addressing identified limitations to the sand dune
ecosystem dynamics: small, focused experiments