Abstract from AMS Scientific Conference '24, Amsterdam, Netherlands.In the two-year Nature-Based Area Development study researchers at four Dutch universities collaborated with planning professionals in cities, regions and companies to investigate how nature-based urban development can become a forceful reality. The study applied a combination of methods such as co-research sessions with consortium partners, in-depth interviews with experts and a multiple case study analysis of best practices in the Netherlands and abroad.Keywords: nature-based, area development, densification, urban ecosystem services, planning instruments
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Nature-based solutions (NBS) bieden veel kansen om de waterveiligheid te verhogen en tegelijkertijd natuurwaarden te versterken. In dit artikel worden zowel een aantal ecologische en juridische aspecten besproken als de consequenties van NBS in voorlanden tussen dijk en water, ten behoeve van het overstromingsrisicobeheer.
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Het lectoraat Nature-based River Management is ruim een jaar geleden van start gegaan. Lector Jantsje van Loon-Steensma richt het onderzoek vooral op de regio. 'Onze studenten komen veelal uit de regio en gaan daar ook vaak werken. Daarom vind ik het belangrijk dat het onderzoek naar natuur-gebaseerde oplossingen dichtbij is. Studenten zijn dan goed voorbereid om een bijdrage te leveren aan een groene en klimaatbestendige regio.'
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Habitat fragmentation caused by urbanization and climate change are important drivers of biodiversity decline and ecosystem degradation (McKinney, 2002). Governmental inaction results in cascade effects, such as the extinction of species and the weakening of ecosystem services that citizens depend on. Alarming studies show the continuing loss of nature within European cities as they densify further to meet the demand for housing (Balikçi et al., 2022). The housing market is currently impacted negatively by economic factors and municipalities often respond by scaling back their sustainability ambitions. To avoid cosmetic greening of cities, the eco-social value of urban developments and their contribution to climate-change adaptation need to be made measurable. Developing nature-based urban areas offers opportunities to increase socio-ecological resilience (McPhearson et al., 2015; Spanjar et al., 2022).In the two-year Nature-Based Area Development study researchers at four Dutch universities collaborated with planning professionals in cities, regions and companies to investigate how nature-based urban development can become a forceful reality. The study applied a combination of methods such as co-research sessions with consortium partners, in-depth interviews with experts and a multiple case study analysis of best practices in the Netherlands and abroad. Malmö and Stockholm are frontrunners in applying innovative green planning instruments such as Green Area Factor to meet high environmental ambitions (Kruuse, 2011). These instruments were also analysed and compared with eco-city projects in the Netherlands to identify their effectiveness in fostering nature and ecosystem services.The analysis shows barriers in governance and spatiality between public and (semi-)private developments. Policy silos and ownership divisions often lead to standalone interventions that negatively impact social and ecological connectedness and projects’ potential for climate-change adaptation. Nature-based urban developments require a proactive effort to understand the precise ecological demands across scales and how they can be harnessed effectively in these complex planning processes. The results of the study provide key lessons and inspiration to enable authorities to implement more effective nature-based planning instruments.
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As the field of climate adaptation has entered an implementation and acceleration phase, measures for urban water and heat management are rapidly spreading in cities across the globe. Especially nature-based solutions have seen a recent rise in implementation to fight flooding, heat, drought, and biodiversity loss. Despite decades of experience, there is still a lot unknown about the long-term functioning of these measures and how this relates to design, development, and maintenance decisions. To this end, this chapter explores the relations between characteristics and performances of urban nature-based solutions, based on empirical research conducted in over 50 swales throughout the Netherlands between 2021 and 2022. The research combined various fieldwork methods such as full-scale infiltration tests to assess the hydraulic functionality and heavy metal accumulation tests by using an XRF-scanner, as well as neighborhood surveys to assess local perceptions of these swales and their functions. This chapter describes and illustrates these approaches for mapping and assessing the performance of swales, followed by a reflection on their suitability for linking design choices and performance indicators. Based on national guidelines, these indicators help to establish minimal performance quotas to evaluate and compare the performance of swales. While most of the researched swales met national criteria for hydraulic performance, almost a third of investigated swales exceeded norms for heavy metal accumulation. By building up a national database of swales and data derived through measurements, we attempt to find patterns among successes and failures in swale design through cross-case comparison, but conclude that these heavily rely on local circumstances and context-depending design choices. Expanding on mapping, assessment, and evaluation approaches can lead to a better understanding of these context-depending chances and risks for developing nature-based solutions.
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This project challenges traditional cognition-based research methods. While informative, they do not fully capture the complexity of economic transformation. This hinders our ability to support regenerative entrepreneurs in their journey toward a fair and sustainable economy. At AUAS Centre for Economic Transformation, our search for a more integrative approach to building new business models, led us to arts- and nature-based research. We are intrigued by art- and nature-based research as a tool to integrate cognitive, emotional and practical elements (head/ heart/ hands). Our curiosity led us to the following research question: how can innovative methodologies that focus on lessons from the arts (creativity) and nature (diversity) help to enrich the understanding of economic transformation among researchers and entrepreneurs engaged in regenerative practices. This study employs an action-oriented research approach, including progressive learning and reflective monitoring and evaluation. During workshops the researchers and entrepreneurs go outside and collect pieces of nature. With these materials they compose their own work of art. Participants, under guidance, step-by-step, 'engage in dialogue' with their artwork based on their own question, eventually experiencing (a direction to) an answer. This project brings together researchers with expertise in the diverse fields of entrepreneurship, craftsmanship, co-ownership and economic ecosystems and entrepreneurs of regenerative practices. They emerge themselves in innovative research methods aimed at integrating head, heart, and hands to enhance diversity and creativity and enrich their understanding of economic transformation. The presentation will be enriched by the works of Claudy Jongstra, a Dutch artist and regenerative entrepreneur.
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''There is a clear demand for a collaborative knowledge-sharing on climate adaptation and mitigation. As a consequence of urban expansion, green spaces are lost and the available areas for pervious green areas are decreasing. Many cities will experience greater impacts from flooding and heatstress due to climate change. Blue-green and small scale Nature-based solutions (NBS) such as bio swales, raingardens and wetlands offer opportunities to adapt urban areas to the impacts of climate change, but their multiple benefits are often unknown to the wider public. Research suggests that effective management of mitigate flood events and heat stress will be achieved by applying a range of NBS measures at different locations in cities [Majidi et al 2019]. Mapping of these (potential) locations for NBS will raise awareness and contribute to capacity building on climate adaptation. Some open source Climate Change Adaptation Platforms (CCAPs) allow mapping of NBS by citizen science and can help to inform and inspire different stakeholders on the topic of climate adaptation in respective region. The aim of most CCAPs is to facilitate an open and free exchange of knowledge on an international scale. Raising awareness about climate adaptation in urban areas and promoting NBS are also key aims.''
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As a consequence of climate change and urbanization, many cities will have to deal with more flooding and extreme heat stress. This paper presents a framework to maximize the effectiveness of Nature-Based Solutions (NBS) for flood risk reduction and thermal comfort enhancement. The framework involves an assessment of hazards with the use of models and field measurements. It also detects suitable implementation sites for NBS and quantifies their effectiveness for thermal comfort enhancement and flood risk reduction. The framework was applied in a densely urbanized study area, for which different small-scale urban NBS and their potential locations for implementation were assessed. The overall results show that the most effective performance in terms of flood mitigation and thermal comfort enhancement is likely achieved by applying a range of different measures at different locations. Therefore, the work presented here shows the potential of the framework to achieve an effective combination of measures and their locations, which was demonstrated on the case of the Sukhumvit area in Bangkok (Thailand). This can be particularly suitable for assessing and planning flood mitigation measures in combination with heat stress reduction.
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Effects of climate change in cities are evident and are expected to increase in the future, demanding adaptation. In order to share knowledge, raise awareness and build capacity on climate adaptation, “ClimateCafés” have been utilized since 2012 in over 50 global events. ClimateCafé is a field education concept involving different fields of science for capacity building in climate adaptation depending on the specific needs of stakeholders. This chapter describes the need, method and results of two ClimateCafés performed in North America in 2022. In North America, there was a clear demand for proof of the long-term efficiency of small-scale urban nature-based solutions (NbS), since the hydraulic capacity of rain gardens and swales is often questioned in low permeable soils and high groundwater tables. The main research question in the ClimateCafés is: Which variation of the (un)saturated infiltration capacity can be expected under conditions with low permeable soil and high groundwater tables (under sea level)? To answer this research question, participative monitoring of NbS has taken place on swales and rain gardens implemented in New Orleans (under sea level) and Vancouver (bed rock). The ClimateCafés aimed at generating context-specific data on nature-based solutions by using open-source tools and cost-effective data collection techniques. The results of the workshops show that relevant, multidisciplinary data can be gathered in a short period of time with limited resources. As example, over 500 individual NbS projects are mapped in both cities from which a selection is made for field research with several stakeholders. The method of the conducted research consisted of a full-scale testing method, measuring the long-term infiltration capacity of rain gardens and swales installed in the last two decades. The results show a high variation of empty times for rain gardens and swales (26–300 mm/h) with fast decreasing infiltration capacity after saturation of the soil (second test showed a decrease in the order of 35%). The ClimateCafés stimulated accelerated climate action and support for national and international knowledge exchange in adaptation solutions for a climate resilient future. Besides raising awareness and capacity building, the evaluation of the outcomes of the ClimateCafés Vancouver and New Orleans lead to practical guidelines and cost-effective interventions to optimize the performance of existing NbS and a strategy for implementing optimized NbS in the near future.
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As a consequence of climate change and urbanization, many cities will have to deal with more flooding and extreme heat stress. This paper presents a framework to maximize the effectiveness of Nature-Based Solutions (NBS) for flood risk reduction and thermal comfort enhancement. The framework involves an assessment of hazards with the use of models and field measurements. It also detects suitable implementation sites for NBS and quantifies their effectiveness for thermal comfort enhancement and flood risk reduction. The framework was applied in a densely urbanized study area, for which different small-scale urban NBS and their potential locations for implementation were assessed. The overall results show that the most effective performance in terms of flood mitigation and thermal comfort enhancement is likely achieved by applying a range of different measures at different locations. Therefore, the work presented here shows the potential of the framework to achieve an effective combination of measures and their locations, which was demonstrated on the case of the Sukhumvit area in Bangkok (Thailand). This can be particularly suitable for assessing and planning flood mitigation measures in combination with heat stress reduction.
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