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This chapter presents a modeling and simulation analysis ofOffshore Ulva farming offshore Ulva sp. cultivation utilizing deep-seaDeep-sea nutrients water (DSW) pumping for nutrient supply. Energy efficiency is a critical factor in artificial upwellingArtificial upwelling feasibility, with pipe diameter significantly impacting energetic costsEnergy costs. Through simulations, an optimal diameter of 0.5 m was selected for further analysis based on energy efficiency and operational feasibility. The study explores biomass production potential over a 21-day cultivation cycle across a 10 ha area, yielding between 0.4 and 17.1 tons of dry biomass, 21–751 kg of protein, and 59–1484 kg of starch, depending on fertilization schemes. A strong correlation was found between increased energy input and enhanced biomass productivity, yet the Exergy Return on Investment (ExROI) remains significantly lower than terrestrial and microalgal crops. Comparisons with other cultivation systems indicate that while Ulva sp. can yield competitive protein outputs, its low energy efficiency necessitates improvements in power supply methods. The integration of self-sustaining energy sources, such as wave and wind-powered upwelling systems, presents a potential pathway to increase viability. This study provides critical insights into optimizing offshore macroalgae farming, supporting the development of sustainable andSustainable ocean farming scalable ocean-based food and biofuel production systems.

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Models at Work: Deep-Water Nutrient Supply Offshore Cultivation Model

  • 章节

  • 发表日期：

    2025年

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  • Meiron Zollmann,
  • Alexander Liberzon,
  • Alexander Golberg

摘要

This chapter presents a modeling and simulation analysis ofOffshore Ulva farming offshore Ulva sp. cultivation utilizing deep-seaDeep-sea nutrients water (DSW) pumping for nutrient supply. Energy efficiency is a critical factor in artificial upwellingArtificial upwelling feasibility, with pipe diameter significantly impacting energetic costsEnergy costs. Through simulations, an optimal diameter of 0.5 m was selected for further analysis based on energy efficiency and operational feasibility. The study explores biomass production potential over a 21-day cultivation cycle across a 10 ha area, yielding between 0.4 and 17.1 tons of dry biomass, 21–751 kg of protein, and 59–1484 kg of starch, depending on fertilization schemes. A strong correlation was found between increased energy input and enhanced biomass productivity, yet the Exergy Return on Investment (ExROI) remains significantly lower than terrestrial and microalgal crops. Comparisons with other cultivation systems indicate that while Ulva sp. can yield competitive protein outputs, its low energy efficiency necessitates improvements in power supply methods. The integration of self-sustaining energy sources, such as wave and wind-powered upwelling systems, presents a potential pathway to increase viability. This study provides critical insights into optimizing offshore macroalgae farming, supporting the development of sustainable andSustainable ocean farming scalable ocean-based food and biofuel production systems.