Adaptation analysis for environmental change in coastal communities

• Develops and applies multicriteria decision evaluation and support system for evaluating adaptation options for coastal communities.
• Estimates vulnerability, resilience, adaptive capacity for coastal communities' environmental, economic, social, cultural dimensions.
• Uses a multi-participant formulation of the Analytical Hierarchy Process (AHP).
• Framework applied to the coastal community of Little Anse on Isle Madame, Nova Scotia and the state of the Little Anse breakwater.
• Adaptation options for protecting, accommodating, and retreating are presented and evaluated with preference for a new breakwater arm.

Small islands and coastal communities around the world are particularly vulnerable to climate change impacts, mainly from storm surge attributed to more frequent and severe coastal storms, and mounting sea-level rise. Coastal hazards including inundation, salinisation of the water supply, and land erosion all threaten vital infrastructure that support coastal communities. This research, part of the International Community-University Research Alliance (ICURA) C-Change project “Managing Adaptation to Environmental Change in Coastal Communities: Canada and the Caribbean”, develops and applies a multicriteria decision evaluation and support system for evaluating adaptation options for coastal communities. The paper estimates vulnerability, resilience, and adaptive capacity measures associated with adaptation strategies in coastal communities with respect to their environmental, economic, social, and cultural dimensions. Results are determined using a multi-participant formulation of the Analytical Hierarchy Process (AHP) for identifying multicriteria decisions as adaptation strategies in a specific coastal context. The application of the framework is conducted for the coastal community of Little Anse on Isle Madame, Nova Scotia. Specifically, the state of the Little Anse breakwater is analysed and adaptation options for protecting, accommodating, and retreating are presented and evaluated in the face of predicted storm scenarios. The results indicate that, in the case of Little Anse, the strategic decision to protect the community by a new breakwater arm provides preferred measures for resilience and adaptive capacity.