Thursday, February 29, 2024

Protecting coastlines and communities with nature-based solutions

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Concepts we are exploring include: 

We are also co-authoring guidelines to support ecological enhancement. Working with Natural Resources Wales we are providing guidelines to improve coastal biodiversity in coastal structures. For the Ecostructure Project, an interdisciplinary European research project exploring building ecologically sensitive design into artificial coast structures, we compiled research outputs from a five-year project into a useful guide for practitioners. 

Benefits of natural interventions to projects 

The benefits of these solutions to water-based and infrastructure projects are far reaching for the environment, communities and organisations. 

Environmental benefits range from local ecosystem regeneration, improved water quality, increased species diversity, and carbon sequestration through carbon embodied in the roots and vegetation of plants, and biomass within retained soil. Other benefits include soil retention through root growth which reduces erosion and sedimentation thereby improving stability and water quality. When nature-based solutions are implemented on a larger scale, these effects can contribute to reversing biodiversity loss and mitigating and adapting to climate change. For example, a community-based mangrove restoration project in Mikoko Pamoja, Kenya, conserves 2,500 tonnes of carbon each year from avoided degradation and new planting.2

Community benefits include strengthened resilience from climate shocks and stressors, a healthier local environment, more attractive landscape, increased availability of clean water, food security and improved aquaculture opportunities.

Almost three-quarters of the world’s population live within 50 kilometres from a coastal zone.3 Working with the Asian Development Bank, we sought to find out how nature-based solutions can contribute to community resilience. We adapted our City Resilience Framework to see where nature-based solutions fit and found they play a significant role in every part of the framework – from creating system redundancy to responding to climate stress.4

Less concrete infrastructure and more natural elements can enhance community wellbeing, safety and inclusion. Our Nature-based Play research publication provides examples of how nature-based solutions can help connect children with the local ecology and provide opportunities for outdoor play. 

Economic benefits for vulnerable communities. When community-led, nature-based solutions can generate livelihoods for vulnerable community groups in the design, delivery and maintenance. Organisations can leverage communities’ knowledge of a costal environment’s historical hazards and vulnerabilities to create resilient climate and community solutions.5

Organisations can also gain significant engineering and construction cost savings. The World Economic Forum estimates nature-based infrastructure can be 50 per cent cheaper than hard infrastructure and deliver 28 per cent more added value.6 Organisations can also use these solutions to accelerate their sustainability commitments and improve their brand perception by showing a commitment to environmental sustainability.

Challenges for integrating nature into projects

While coastal nature-based solutions clearly have vast potential and benefits, they are not yet the norm and often treated as a ‘bolt on’ extra rather than a conventional engineering solution. There are several reasons why this is the case, however they are all challenges we are working to overcome. 

Limited documented design guidance for nature-based coastal resilience solutions. To overcome this, we take a data-driven approach using insights and supporting new research. We do this through our Invest in Arup research programme, bringing data and insights together across our global projects and collaborating with industry. Critical to our research is Thomas Dunlop, our coastal engineer, who is researching nature-based solutions guidelines through a PhD with the University of New South Wales with the goal to improve predictions of nature-based solutions growth and shoreline protection functionality. 

Understanding the cost of nature-based solutions. While there may be reduced upfront costs, there could be more maintenance costs than with traditional infrastructure. However, working with communities and First Nations peoples we can gather more evidence to understand the costs, create community employment and opportunities to care for Country. 

Reputation. If a new solution proves less successful in the short term than a hard infrastructure approach, stakeholders and communities may become despondent. To counter this issue, we can involve stakeholders and communities in design, delivery, operations and maintenance. With greater understanding and appreciation of the potential benefits of nature-based solutions, stakeholders may be more willing to experiment, learn and incorporate nature-based solutions within typical engineering solutions. 


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