management in white dunes
TRANSCRIPT
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07-10-2015,
Leon Terlouw; PWN
Maaike Veer; Waternet
Project Noordwest Natuurkern - part of Life Project Dutch Dune Revival
Management of white dunes
The answer blowing in the wind?
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Where?
Natura2000 Kennemerland-Zuid Nr. 88
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Dunes were very much stabilized
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Causes of
stabilisation
Sea-defence
>CO2; >temperature
and >rain
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1998 Era of new management: dynamic dune management
several large scale experiments
Reactivating moving dunes
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2009
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Lessons of reactivating large scale movingdunes in the innerdunes
• Large scale projects are active for at least 10 years
• Stabilisation by remainssprouting from roots
• Follow up management is necessary to remove theremnants of formermanagement
• New formation of wet duneslacks is successful
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Importance of frontdunes dynamics
• Living dunes at the seaside
• Dynamics (wind, salt, sand) from seaside to innerdunes
• Shower of lime to innerdunes
• Start of dune formation
• Necessary for conservation of Grey and White dunes
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Availability of sand is important
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Fresh sand from the beach is
blown through the gullies into
the dunes
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Results
2012
2013
2014
2015
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Houtglop
Before
After
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2013From the westside
of the dune fresh
sand is blown out
of the dune slack
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2015Valleyfloor adapted to
current groundwatertable
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2013
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2015
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In the deposition zone fresh sand can reach
large distances (500-1000 m) to rejuvenate
and fight acidification of grey dunes
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Dynamic dunes, especially small
scale blowouts are necessary for
biodiversity and healthy grey dunes
Future management strategy:
reactivation of small blowouts
throughout the entire dune system
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Vlaggenduin near Katwijk, 15-4-2015
Bas Arens
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Barren
Little Rubus growth
Some Rubus growth
Much Rubus growth
Few roots
Many roots
Little Ammophila
Some Ammophila
Much Ammophila
Other vegetation
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westGulliesin most western
dunes
Because of high
dynamics little
management
needed
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High dynamicsKattendel Summer 2008
Dec. 5; 2013 Jan 19; 2015
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Follow-up management by weeding
To remove previous stabilization influence of man
Regrowth of Rubus caesius from old roots
Parabolic dunes:
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We tried different kinds of follow up management
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Steep slopes weeded by volunteers
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(Mechanical) removal of roots
and vegetation should be
repeated several times to be
effective
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Hopefully effective!Rubus caesius can have roots up to 1.7 m deep
Untill now 3 different treatments done…..
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Do these dunes stay mobile on the long run in current climaticconditions?
The answer is blowing in the wind!