Coastal vulnerability to climate change in China's Bohai Economic Rim

Area of Science:

• Environmental Science
• Climate Change Adaptation
• Coastal Management

Background:

• Urban coastal areas face increasing stressors from climate change and human activities.
• Integrated assessments of ecological, physical, and socioeconomic factors are lacking for coastal vulnerability studies.
• Effective coastal interventions require a comprehensive understanding of vulnerability.

Purpose of the Study:

• To develop and apply a holistic framework for assessing coastal vulnerability.
• To identify highly vulnerable coastlines and populations in the Bohai Economic Rim.
• To inform targeted climate change adaptation and sustainable coastal management strategies.

Main Methods:

• Developed a composite vulnerability index (CVI) framework integrating biophysical exposure, sensitivity, and adaptive capacity.
• Applied the CVI to 5627 km of coastline in the Bohai Economic Rim, analyzing present and future scenarios.
• Mapped CVI distribution and identified key determinants of vulnerability.

Main Results:

• Significant spatial heterogeneity in coastal vulnerability was observed, with higher CVIs in southwestern and northeastern areas.
• Currently, 20% of coastlines, impacting ~350,000 people, are highly vulnerable.
• Future sea-level rise scenarios project increased coastal vulnerability and a 13-24% rise in threatened populations by 2100.
• Dongying city exhibits highest vulnerability due to low adaptive capacity (poor infrastructure, low GDP per capita).

Conclusions:

• The developed CVI framework provides a robust tool for assessing coastal vulnerability.
• Results highlight critical areas and populations requiring immediate attention for climate adaptation.
• Findings support evidence-based, location-specific interventions for sustainable coastal zone management.