Contribution à l'évaluation économique des marées vertes

Abstract : Due to seasonal blooms of green macro-algae belonging to the ulvaceae family, green tides are part of the larger class of harmful algal blooms (HAB), which has developed worldwide at a high rate during the last three decades, favoured by the eutrophisation of coastal waters due to human activities. The massive accumulation of seaweeds on the shore resulting from green tides generates a variety of damages to market and non-market activities, and is a potential threat to human health. In the same time, green algae are a natural resource that may be turned into a variety of valuable products through industrial processing. R&D programs devoted to this subject have been launched in countries subject to green tides, such as China and France.The subject of this dissertation is the economic assessment of green tides, in a cost-benefit perspective. To this end, it studies the costs of green tides for private agents and public bodies, as well as the benefits due to the processing of algae.The dissertation relies on two case studies, one in China (Yellow Sea), and the other in France (Brittany). Chapter 1 and chapter 2 are dedicated to the case of the green tides that have developed each spring in the Yellow Sea and reached the southern shore of the Shandong province during the last decade. Chapter 1 investigates the bio-economic mechanisms of these episodes, their economic consequences, public management policies, and stakeholders’ perceptions. Chapter 2 tries to quantify the social cost of green tides, including management costs (minus benefits generated by green algae processing) and residual costs to market and non-market activities. Chapter 3 relies on the Brittany case, and focuses on the economic consequences of green algae industrial processing. Making use of a regionalized input-output table, it estimates, at various geographical scales, the economic impact of a program concerning the industrial processing of algae that are collected during the green tides on the Brittany shoreline.
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Yi Yang. Contribution à l'évaluation économique des marées vertes. Economies et finances. Université de Bretagne occidentale - Brest, 2016. Français. ⟨NNT : 2016BRES0122⟩. ⟨tel-01531265v2⟩

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