Hamble Harbour ExoHabitats
➤ February 2022 ➤ River Hamble Harbour, Hampshire ➤ River Hamble Harbour Authority ➤ Marine Development Ltd.
Problem
Installations of sheet piling, corrugated iron and smooth concrete can be found throughout harbours, marinas, and riverbanks. The steep slopes and smooth surfaces prevent these structures from being inhabited by local species, diminishing the provision of usable habitats which remain moist at low tide.
Solution
Two prototype ExoHabitats were installed in the Hamble Harbour in the summer of 2020, using a custom-made steel frame to fasten them to the inside of the sheet piling. These habitats have been continually monitored over the past few years, which has allowed us to assess their capacity for retaining water and stimulating settlement of pioneer species. The ExoHabitats feature 3 water-retaining cups which create a consistently moist and cool environment for intertidal species to inhabit. The background pile is covered in a honeycomb texture to increase the surface heterogeneity, creating a favourable environment for invertebrates and algae whilst protecting coastal areas.
Results
Initial monitoring in December 2020 showed a film of aqueous algae covering the textured surface, with all habitat cups filled with tidal mud. These cups were found to support microbenthic organisms such as Bristle Worms, which indicated a positive first growing season with pioneer macroalgae and higher trophic fauna present. In this way, we can work with our clients to achieve nature inclusivity whilst protecting the coastline from the erosive processes present in waterfront environments.
