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This chapter presents a deep seawaterDeep seawater (DSW)-based offshore cultivationOffshore cultivation model to estimate the production potential ofUlva productivity Ulva sp. in the Eastern Mediterranean Sea. The study extrapolates biomass yield, protein production, and starch accumulation for a 10 ha cultivation area under different fertilization scenarios. Two extrapolation methods, High Irradiance Extrapolation (HIE) and Low Irradiance Extrapolation (LIE), account for varying light availability in offshore environments, providing insights into the relationship between irradiance, reactor design, and photosynthetic efficiency. Energetic requirements for artificial upwellingArtificial upwelling are analyzed by scaling laboratory-based water exchange simulations to offshore conditions. The study calculates DSW pumping flow rates, energy consumption, and system efficiency using the Darcy-Weisbach equation and hydraulic power modelingEnergy modeling. The ExROIExergy Return on Investment (ExROI) metric is applied to assess the energetic feasibility of offshore macroalgae cultivation, focusing on fossil fuel-derived energy inputs. Additionally, the potential integration of Ocean Thermal Energy Conversion (OTEC) with DSW pumping is explored, evaluating its theoretical efficiency and energy production potential. This analysis provides a framework for optimizing offshore seaweed farming, emphasizing the role of artificial upwellingArtificial upwelling in enhancing nutrient availability and sustainable bioresource production.

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Offshore Cultivation of Ulva sp.: Growth Modeling, Deep Seawater Nutrient Utilization, and Energetic Efficiency

  • 章节

  • 发表日期：

    2025年

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  • Meiron Zollmann,
  • Alexander Liberzon,
  • Alexander Golberg

摘要

This chapter presents a deep seawaterDeep seawater (DSW)-based offshore cultivationOffshore cultivation model to estimate the production potential ofUlva productivity Ulva sp. in the Eastern Mediterranean Sea. The study extrapolates biomass yield, protein production, and starch accumulation for a 10 ha cultivation area under different fertilization scenarios. Two extrapolation methods, High Irradiance Extrapolation (HIE) and Low Irradiance Extrapolation (LIE), account for varying light availability in offshore environments, providing insights into the relationship between irradiance, reactor design, and photosynthetic efficiency. Energetic requirements for artificial upwellingArtificial upwelling are analyzed by scaling laboratory-based water exchange simulations to offshore conditions. The study calculates DSW pumping flow rates, energy consumption, and system efficiency using the Darcy-Weisbach equation and hydraulic power modelingEnergy modeling. The ExROIExergy Return on Investment (ExROI) metric is applied to assess the energetic feasibility of offshore macroalgae cultivation, focusing on fossil fuel-derived energy inputs. Additionally, the potential integration of Ocean Thermal Energy Conversion (OTEC) with DSW pumping is explored, evaluating its theoretical efficiency and energy production potential. This analysis provides a framework for optimizing offshore seaweed farming, emphasizing the role of artificial upwellingArtificial upwelling in enhancing nutrient availability and sustainable bioresource production.