1) The document discusses management of white dunes in the Natura2000 Kennemerland-Zuid area in the Netherlands as part of a project to revive Dutch dune ecosystems. 2) In the late 1990s, management shifted towards more dynamic dune management and experiments reactivating moving dunes after years of stabilization. 3) Lessons learned were that large-scale reactivation projects take over 10 years and follow-up management is needed to remove remnants of prior stabilization and promote new wet dune slacks.

1. 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?

2. Where?
Natura2000
Kennemerland-Zuid
Nr. 88

3. Dunes were very much stabilized

4. Causes of
stabilisation
Sea-defence
>CO2; >temperature
and >rain

5. 1998 Era of new management:
dynamic dune management
several large scale experiments
Reactivating moving dunes

6. 2009

7. Lessons of reactivating large scale moving
dunes in the innerdunes
• Large scale projects are
active for at least 10 years
• Stabilisation by remains
sprouting from roots
• Follow up management is
necessary to remove the
remnants of former
management
• New formation of wet dune
slacks is successful

8. 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

9. Availability of sand is important

10. Fresh sand from the beach is
blown through the gullies into
the dunes

11. Results
2012
2013
2014
2015

12. Houtglop
Before
After

15. 2013
From the westside
of the dune fresh
sand is blown out
of the dune slack

16. 2015
Valleyfloor adapted to
current groundwatertable

17. 2013

18. 2015

19. In the deposition zone fresh sand can reach
large distances (500-1000 m) to rejuvenate
and fight acidification of grey dunes

20. 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

21. Vlaggenduin near Katwijk, 15-4-2015
Bas Arens

23. Barren
Little Rubus growth
Some Rubus growth
Much Rubus growth
Few roots
Many roots
Little Ammophila
Some Ammophila
Much Ammophila
Other vegetation

24. west
Gullies
in most western
dunes
Because of high
dynamics little
management
needed

25. High dynamics
Kattendel Summer 2008
Dec. 5; 2013

26. Follow-up management by weeding
To remove previous stabilization influence of man
Regrowth of Rubus caesius from old roots
Parabolic dunes:

27. We tried different kinds of follow up management

28. Steep slopes weeded by volunteers

29. (Mechanical) removal of roots
and vegetation should be
repeated several times to be
effective

30. Hopefully effective!
Rubus caesius can have roots up to 1.7 m deep
Untill now 3 different treatments done…..

31. Do these dunes stay mobile on the long run in current climatic
conditions?
The answer is blowing in the wind!