Building with Nature in practice: Two examples on wetland restoration. Petra Dankers & Thomas Vijverberg 19 April 2011. Introduction.
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Petra Dankers & Thomas Vijverberg
19 April 2011
Wetland = areas of marsh, fen, peatland or water, natural or artificial, permanent or temporary, water that is static or flowing, fresh, brackish or salt.
Two examples of Building with Nature in practice
degeneration of lake systems
creating stepping stone
- high turbidity
- no interesting ecosystem
While the lake would be suitable as
- stepping stone
- habitat for fresh water flora and fauna
- high quality recreation and living area
NMIJ project – More natural Lake Marken and Lake IJ
goal: developing measures to create a robust ecosystem and climate proof water system
measure: enlarging habitat diversity by creating a large fresh water marsh (wetland)
Task: give advice on building/creating new wetland
BwN: allow natural processes to shape and develop the wetland (no polder, no dikes preventing water inflow, open boundaries)
Step 1: reference situations
Step 2: translate to Lake Marken situation
Building block plas dras
Material from Lake Marken
- top layer is holocene material (mud, clay, peat)
But how do you build with mud?
is it stable, does it stay in place?
does it set and how much?
how much does it consolidate?
when can things start growing?
when can you walk on it?
PILOT LAKE MARKEN MARSH
Ecology is leading but engineering is tested (because of time frame)
Laboratory in Lake Marken of a few ha.
Testing consolidation, construction, behaviour and suitability for developing marsh/swamp pioneer vegetation
Result: in 2015 advice on creating large marsh in Lake Marken