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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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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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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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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The city is nature. In many ways this bold statement can be contested, but at the same time wildlife is so abundant Rotterdam is called a wilderness park (Reumer, Wildpark Rotterdam. De stad als natuurgebied. Historische Uitgeverij, Groningen, 2014). One can discuss whether this is true or not, but more interesting is to see the city as a piece of nature, and as such undertake the actions to develop it further. In a city nature should not be treated as something worth to preserve, after all such unique nature can hardly be found inside urban contexts, rather something to increase, enrich and make more resilient
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There is a clear demand for a collaborative knowledge-sharing on climate adaptation and mitigation. The aim of most climate adaptation platforms is (inter)national knowledge exchange and raising awareness about climate adaptation in urban areas and promote solutions such as Nature-based solutions (NBS) and floating infrastructure. However their multiple benefits are often unknown to the wider public. During seminars (February 2020) in Indonesia climate adaptation measures where mapped and the relevance of the climate adaption platforms such as ClimateScan was evaluated by the means of workshops and a survey. The platform ClimateScan holds now over 5000 locations in 5 main categories of climate adaptation (water, nature, agriculture, energy and people). The conclusions from the workshops in Semarang and Surabaya show high relevance scores for NBS: permeable pavement and swales; for infiltration of stormwater to groundwater; for mitigation of high temperatures with heat stress measures; and flood barriers to mitigate flooding. There were low scores for floating urbanization because this is not a culturally accepted practice in contradiction to other parts of the world. Indonesian floating infrastructure as a floating library, restaurant and airport terminal where mapped during workshops bringing the total of international floating structure locations to 150. The workshops have raised awareness among participants and contributed to capacity building by empowering the participants to map and review climate adaptation measures. A high majority see the value of climate adaptation platforms and will use it in the future.
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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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Online knowledge-sharing platforms could potentially contribute to an accelerated climate adaptation by promoting more green and blue spaces in urban areas. The implementation of small-scale nature-based solutions (NBS) such as bio(swales), green roofs, and green walls requires the involvement and enthusiasm of multiple stakeholders. This paper discusses how online citizen science platforms can stimulate stakeholder engagement and promote NBS, which is illustrated with the case of ClimateScan. Three main concerns related to online platforms are addressed: the period of relevance of the platform, the lack of knowledge about the inclusiveness and characteristics of the contributors, and the ability of sustaining a well-functioning community with limited resources. ClimateScan has adopted a “bottom–up” approach in which users have much freedom to create and update content. Within six years, this has resulted in an illustrated map with over 5000 NBS projects around the globe and an average of more than 100 visitors a day. However, points of concern are identified regarding the data quality and the aspect of community-building. Although the numbers of users are rising, only a few users have remained involved. Learning from these remaining top users and their motivations, we draw general lessons and make suggestions for stimulating long-term engagement on online knowledge-sharing platforms
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