i4 DamSafety

Integrated & Intelligent Integrity Instrumentation for dam safety

Dike reinforcement Texel

The Dike Reinforcement Texel project includes the reinforcement of the Wadden Sea Dike Texel, part of the management area of the Hoogheemraadschap Hollands Noorderkwartier (HHNK).

Commissioned by the Combinatie Tessel (Boskalis Nederland and KWS Infra), CRUX contributed to the geotechnical design for two sections.

For section 10 't Horntje, CRUX drew up the geotechnical preliminary, definition and execution design in accordance with the Legal Assessment Instruments (WBI 2017) for flood defences. This section is characterised by upgrading an existing foreshore barrier to a primary flood defence. In the elaboration of the section, traditional ground solutions, partly hidden flood defences and a sheet pile wall have been applied.

For section 7D Havendam, CRUX contributed to the geotechnical final and implementation design as well as geohydrological issues. Section 7D is characterised by upgrading the Havendam Oudeschild to a primary barrier in order to reduce the wave conditions on the underlying dike.

EEM model dike reinforcement

In the harbour dam the core is made up of seaweed. This seaweed core was installed around the year 1500. Due to the introduction of pile worms around the year 1730, the row of piles in front of it was damaged, which allowed the weed to erode under the influence of the sea. From 1730 until around 1850 the dike was reinforced by methods used up to the present day.

Eroded seaweed dike near Oudeschild 1811

Most of the dyke reinforcement will be located on the old seaweed core, which required a lot of effort in terms of research and design in relation to settlements and stability.

More information (Dutch only) about the project can be found on: https://www.hhnk.nl/waddenzeedijk and https://www.combinatietessel.nl/.