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Continuous bubble streams for controlling marine biofouling on static artificial structures.

Grant A Hopkins1, Fletcher Gilbertson1, Oli Floerl1

  • 1Cawthron Institute, Nelson, New Zealand.

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Summary
This summary is machine-generated.

Continuous bubble streams effectively prevent biofouling on marine static artificial structures (SAS). This method disrupts settlement and removes larvae, though diffuser fouling requires further study for long-term applications.

Keywords:
Air bubblesMarinasSettlementStatic structuresTreatment

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Area of Science:

  • Marine Biology
  • Environmental Engineering
  • Materials Science

Background:

  • Biofouling accumulation on marine static artificial structures (SAS) presents a significant challenge.
  • Current management strategies for biofouling on SAS are limited due to a lack of effective options.

Purpose of the Study:

  • To evaluate the efficacy of continuous bubble streams in preventing macroscopic biofouling on marine SAS.
  • To investigate the mechanisms by which bubble streams inhibit biofouling.
  • To assess the feasibility of bubble stream technology for long-term application in marine environments.

Main Methods:

  • Laboratory experiments simulating marine conditions.
  • Field trials conducted over a one-year period on various SAS surface types.
  • Analysis of settlement disruption and larval scouring effects.
  • Assessment of diffuser fouling and environmental noise levels.

Main Results:

  • Continuous bubble streams proved effective in maintaining SAS free of macroscopic biofouling.
  • Two primary mechanisms identified: disruption of larval settlement and scouring of settled larvae via shear stress.
  • Fouling on diffusers emerged as a key challenge for sustained treatment, while associated noise levels were found to be localized and of low environmental risk.

Conclusions:

  • Continuous bubble streams offer a promising, effective solution for managing biofouling on marine static artificial structures.
  • Further research and development are needed to address diffuser fouling and scale up the technology for operational use.
  • The localized and low environmental risk of noise pollution supports the potential of this biofouling management approach.