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Since 2007, persistent green tides in the Yellow Sea of China (YSC) have inflicted substantial economic and social losses. In response, the Chinese government has enacted various policies to mitigate these impacts. This study introduced an evolutionary-multiple streams framework and employed Social Network Analysis (SNA) and Text Analysis from 2007 to 2023, tracing three phases of policy development: growth (2007–2012), stability (2013–2017), and explosion (2018–2023). Findings indicated that during the growth phase, the most of the policy themes were “monitoring” and “emergency”; in the stability phase, policy issuance by provincial and municipal agencies began to increase; in the explosion phase, a basic consensus was reached on source control and intergovernmental cooperation in the management of green tides. Themes such as “ecology”, “extreme weather”, and “green tide exploitation” have been emphasized. This analysis provides insights for future policy formulation in green tide control and broader marine environmental governance.
•An evolutionary-multiple streams framework is applied to analyze green tide policies.•Policymakers are increasingly valuing ecological protection and resource utilization.•The study serves as a crucial reference for advancing green tide control measures.