DAPSI(W)R(M) put into practice for a nature-based solution: Framework applied to the coastbusters approach

Nature-based Solutions (NbS) can be applied to alleviate negative human impacts on ecosystems and promote the general health or well-being of the environment. Human-induced activities, including installation of NbS, are governed by legislative requirements (e.g. Environmental Impact Assessments (EIA)), especially when such activities occur in Marine Protected Areas (MPA's). A correct and thorough description of the legislative framework governing the application and development of NbS is therefore essential. The Drivers-Activities-Pressures-State change-Impacts (on human Welfare)-Responses (using Measures) or DAPSI(W)R(M) framework is valuable when environmental assessment procedures include a NbS, as well as when policy and industry require guidance for the practical application of a NbS concept. In this study, we applied the DAPSI(W)R(M) framework to the Coastbusters approach, in which mussel beds (Mytilus edulis) and tubeworm aggregations (Lanice conchilega) are installed in the Belgian part of the North Sea with the aim of improving coastal resilience and maritime infrastructure works. Within the context of the Coastbusters approach, the various elements of the DAPSI(W)R(M) framework were elucidated. Coastal defense is a driver, with activities including the integration of coastal infrastructure and aquaculture practices. Pressures related to these activities on benthic habitats were described using the MarESA sensitivity approach. State change assessments were performed based on the various marine regulations (e.g. Marine Strategy Framework Directive, Habitat Directive, Water Framework Directive) which together outline a precise set of criteria and indicators designed to assess the sustainability and health of ecosystems. The present study provides a detailed framework for the environmental evaluation of seaward NbS, from state changes to impacts on human welfare. Three quantitative estimations of ecosystem service indicators (coastal protection, carbon retention and water quality (N) regulation) were used, with the indicators quantified by in-situ measurements and data from literature. Subsequently, the 10-tenets approach for taking measures (e.g. use of biodegradable material, local species, etc.) was used to develop responses that facilitate the optimal implementation of NbS. The approach outlined in this study can be used as a guide for stakeholders as they move through the environmental evaluation processes that are required for successful development of a seaward NbS. Our results underscore the importance of a favorable institutional environment for NbS and suggest that public acceptance and stakeholder involvement play a crucial role in successful implementation. This study contributes to the understanding and operationalization of Nature-based Solutions in coastal management.