Required Biological and Environmental Conditions

The objective of artificial seagrass is the development of suitable conditions for the restoration and growth of natural seagrass. This work package aims to determine the hydrodynamic and ecological characteristics that favour and support the growth of Zostera marina as well as their natural variation.

read more

Dimensions for Artificial Seagrass

Observation of the environmental conditions on Work Package 3 provides a starting point towards the development of the Artificial Seagrass. Existing seagrass meadows in the area of interest are important sources of information regarding the environmental conditions needed for the seagrasses to grow and survive.

read more

ASG Performance

In the first year, hydrodynamic as well as morphodynamic measurements will be conducted using a commercially available artificial seagrass which will be installed in the Large Wave Flume. At the end of the project phase all data from the project partners will be compiled to produce an artificial seagrass prototype.

read more

WP5: Suitable Materials and Production Methods

In order to achieve a fully natural seagrass meadow long term, it is envisaged to produce the artificial structures from material that disintegrates completely after a given time frame, i.e. when the natural seagrass is fully established and the artificial structures are no longer required.

The screening of materials that could possibly be used as artificial seagrass (ASG) is orientated towards ecological and hydrodynamic parameters measured in natural seagrass meadows, such as growth patterns, wave/current forces or ecosystem services. This data is collected in work package (WP) 3 and 4.
For the material choice, one also needs to distinguish between the different parts of the entire ASG system, which have different requirements. The following initial material options have been identified:

  • Biodegradable plastics that functionally and optically resemble seagrass
  • Natural materials, fibres and fabrics
  • A combination of natural materials and biodegradable plastics
Picture: Hochschule Hannover

Materials will be characterised with respect to their suitability in terms of degradation, technical and mechanical properties and usable production methods. This evaluation of existing materials will inform requirements for material development or adaptation to achieve the necessary properties for each ASG element as defined by WP4.

A key property for all materials used for the ASG is biodegradation under marine conditions, which is currently unknown for most commercially available biodegradable materials (either natural or bioplastic). Respirometric measurements in bottles will be carried out to estimate the biodegradation behaviour of the different materials in a comparative study. The same tests are required for the potentially suitable natural materials. While it is known that these materials disintegrate, the respective time frames and associated changes in material properties have not yet been evaluated.

The degradation experiments will also consider the chemical composition of residues and potential environmental impacts of intermediate stages of disintegration. This assessment will ensure that utilised bioplastics will not be harmful to marine fauna at any stage of the ASG life cycle and evaluate the effect of non-native natural materials (e.g. coconut mesh) on local ecosystems.

Existing bioplastics can be processed with conventional techniques (e.g. foil extrusion, injection moulding, 3D printing). In order to make newly developed materials within this project commercially viable, their suitability for such production methods will be assessed in this task. This is of particular relevance if additives made from natural materials are used or composites of natural fibres and bioplastic coating are developed. The methods applied and tested within this task will strongly depend on selected materials in this WP and will therefore be defined during the course of the project.


IfBB - Institut für Biokunststoffe und Bioverbundwerkstoffe
Hochschule Hannover

Dr. Carmen Arndt,, Phone: +49 511 9296-2270
Hannah Behnsen,, Phone: +49 511 9296-2295

Project partners

Sponsored by