Nature-Based Solutions最新文献

Sustainable drainage systems (SuDS) for rainwater harvesting and stormwater management in temporary humanitarian settlements

Nature-Based Solutions

Pub Date : 2025-03-08 DOI: 10.1016/j.nbsj.2025.100227

Kiran Tota-Maharaj , Oluwatoyin Opeyemi Ajibade , Shanika Arachchi , Colin Douglas Hills , Upaka Rathnayake

Effective management of stormwater runoff is crucial in refugee camps and temporary shelters. Across the Africa, this is vital especially with the intense rainfalls due to the climate effect. Sustainable Drainage Systems (SuDS) can be implemented to provide potential sources of water resources across refugee camps and internally displaced people (IDPs). The performance of two SuDS (engineered wetlands and biofilters) was evaluated to assess their effectiveness at reducing levels of pollutants in harvested rainwater and stormwater under simulated environmental conditions of an IDP camp. The SuDS comprised a matrix of sub-surface bedding materials and filter media. Stormwater quality analysis aligned with the WHO and CIRIA standards was carried out over 61 weeks simulating environmental conditions. The SuDS significantly reduced nutrients and organics loading from the influent stormwater. The Constructed Stormwater Treatment System S1-a had an overall high performance in removing impurities (BOD – 60 %, COD – 70 %, Turbidity – 70 %, Colour – 72 %, Phosphates – 63 %, Ammonium – 57 % and Nitrates – 57 %). In addition, the Refugee Camp Engineered Stormwater Treatment System S2-d has overall well-performed impurities removal (TDS – 52 %, COD – 100 %, Turbidity – 100 %, Colour – 41 %, Phosphates – 96 %, Ammonium – 98 % and Nitrates – 88 %). The outflow samples from these SuDS found the concentrations are with high standards. However, it is recommended that the treated stormwater be reused for non-potable sources in these conditions. The implementations of this research findings can be further incorporated into the United Nations sustainable developmental goals of good health and wellbeing (SDG 3) clean water and sanitation (SDG 6), and Peace, justice and strong institutions (SDG 16).

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引用次数: 0

Manoeuvring barriers: Assessing adaptive strategies for and persistent barriers to urban Nature-based Solutions in Lilongwe, Malawi

Nature-Based Solutions

Pub Date : 2025-03-03 DOI: 10.1016/j.nbsj.2025.100224

Willi Bauer, Alexandra Titz

Urban Nature-based Solutions (NbS) are increasingly promoted globally as a multifunctional and cost-effective way to address social and environmental challenges in cities. Based on these premises, there is a growing municipal interest in promoting NbS in cities of the so-called 'Global South'. However, current research is still clearly biased towards the 'Global North', with particularly few studies focusing on cities in Sub-Saharan Africa (SSA). As a result of these research gaps, there is a high risk that maladapted NbS – modelled on examples from other regions that do not meet local requirements and needs – will be adopted.

Against this background, this article examines barriers to the adoption of urban Nature-based Solutions and the opportunities for successful implementation of NbS in cities in Malawi. Drawing on qualitative data (workshops, narrative expert interviews, group discussions) collected during five research stays in Lilongwe (2022–2024), the article outlines and analyses in detail the strategies employed to overcome these barriers by those actors in charge for implementing the Lilongwe Ecological Corridor Initiative (LECI), a large-scale NbS in the country's capital city. By empirically exploring the particularities of the implementation of the LECI, the article characterises features of NbS in SSA rarely explored in other contexts, such as the reframing of existing greenspaces, the pragmatic adaptation of NbS-plans and the formulation of by-laws as part of their planning. These insights can serve as a basis for further conceptual developments and critical engagement and to promote a deeper understanding of the potentials and pitfalls of implementation strategies seeking to manoeuvre persistent barriers.

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引用次数: 0

Assessment of the adoption of nature-based solutions for flood risk mitigation: Socio-economic determinants in the River Nyamwamba catchment, Uganda

Nature-Based Solutions

Pub Date : 2025-03-03 DOI: 10.1016/j.nbsj.2025.100225

Nelson Nuwahereza , Susan Balaba Tumwebaze

Floods are the most common and destructive natural disaster being experienced worldwide. This necessitates effective flood risk reduction measures and Nature Based Solutions (NBS) have emerged as promising measures that not only reduce the flood risk but also offer additional environmental and societal benefits. This study aimed to establish the household socio-economic characteristics that determine adoption of NBS for flood risk reduction in the rural mountainous River Nyamwamba catchment, Southwestern Uganda. The study answered the following research questions, (a) to what extent have NBS for flood risk reduction been adopted in River Nyamwamba catchment, (b) How does the stage at which a household becomes involved in a NBS project influence its likelihood of adopting NBS for flood risk reduction? (c) What household socio-economic characteristics significantly affect adoption of NBS for flood risk reduction? The study revealed moderate adoption of NBS for floodrisk reduction, with 54% of households in the catchment having adopted at least one or a combination of river buffer zone restoration and/ or on-farm tree planting. Findings revealed that access to flood risk information, past flood experience, and the number of contributors to household livelihood (number of breadwinners) are the household socio-economic characteristics that significantly affect the adoption of NBS for flood risk reduction. The study also revealed that the stage at which a household becomes involved in a NBS project has no significant impact on the likelihood of adoption of NBS for flood risk reduction. The study recommends improving access to flood risk information, leveraging past flood experiences, and addressing intra-household land use conflicts to enhance adoption of NBS for flood risk reduction. Moreover, the study highlights the need for participatory approaches and sustained community engagement to ensure that NBS interventions are locally acceptable

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引用次数: 0

Operationalizing equity in nature-based coastal adaptation: Assessing practitioner perspectives from the San Francisco Bay Area, California

Nature-Based Solutions

Pub Date : 2025-02-27 DOI: 10.1016/j.nbsj.2025.100223

Olivia M. Won , Katherine L. Seto

Coastal regions are faced with rising sea levels as well as other coastal hazards caused by climate change. As coastal areas begin adapting shorelines to present and future impacts, planners and land managers are increasingly encouraged to pursue nature-based coastal adaptation (NBCA) approaches as opposed to traditional gray infrastructure solutions. Recent policies also emphasize the importance of centering social equity and environmental justice in climate change adaptation initiatives, calling for increased community engagement and the prioritization of project work in disadvantaged communities. Though NBCA and equity-led approaches are growing more mainstream, to date, no empirical work has investigated how practitioners are currently framing and operationalizing concepts of equity in the burgeoning field of practice. Using an analytic of multiple framings of equity, this study describes how practitioners are currently addressing social equity in NBCA projects in the San Francisco Bay Area, a densely populated and highly urbanized estuary in Northern California. We conducted semi-structured interviews with 30 individuals involved in NBCA projects and planning work across the region, including representatives from government agencies, community-based organizations, and consulting groups. We found that practitioners are overwhelmingly focused on strategies to address distributive and procedural inequities. A minority of practitioners applied contextual, management, and Indigenous sovereignty frames of equity, which depend on larger structural shifts in governance, funding models, shoreline property regimes, and land repatriation and require more NBCA-specific approaches. This study demonstrates the importance of sustaining and increasing attention to multiple dimensions of equity in NBCA planning, particularly those that are currently underrepresented in practitioners’ scopes. We argue for developing specific equity interventions that address the unique challenges of integrating nature into urban coastal adaptation and offer recommendations for practitioners seeking to better operationalize multiple frames of equity in NBCA.

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引用次数: 0

Forested bioshields and tsunami impact mitigation in a Polynesian setting

Nature-Based Solutions

Pub Date : 2025-02-22 DOI: 10.1016/j.nbsj.2025.100222

Scott Fisher , James Goff , Andrew B. Cundy , David Sear , Christina McWhorter

In the 21st century tsunamis have claimed the lives of over 250,000 individuals, and have caused extensive damage to vulnerable coastal ecosystems. This vulnerability continues to increase in many areas as human activity further degrades the coastal forests that once provided a degree of protection against storms and tsunamis, collectively known as high energy marine inundation events. This work presents a case study of the design and implementation of a forested bioshield established to protect a vulnerable wetland on Maui's south east coast. Although subject to coastal inundation, this ecosystem provides high quality habitat for numerous endangered species. Anthropogenic modifications around the wetlands, particularly the loss of the protective forest, have made this ecosystem vulnerable to future inundation events. Establishing an effective bioshield requires in-depth knowledge of both the frequency and intensity of inundation events, as well as effective tree species selection and their proper configuration within the bioshield. Here, we present palynological and archaeobotanical data from the studied wetlands, and combine this with local paleotsunami data, previously published data on forested bioshields, and traditional ecological knowledge to design, optimize and install an 8,000 m² forested bioshield, and review the wider benefits and limitations of this bioshield approach.

21 世纪以来，海啸已夺去了 25 万多人的生命，并对脆弱的沿海生态系统造成了广泛破坏。在许多地区，这种脆弱性还在继续增加，因为人类活动进一步退化了沿海森林，而这些森林曾经为抵御风暴和海啸（统称为高能量海洋淹没事件）提供了一定程度的保护。这项工作介绍了一个案例研究，该案例研究了为保护毛伊岛东南海岸的一块脆弱湿地而建立的森林生物场的设计和实施情况。虽然受到海岸淹没的影响，但该生态系统为众多濒危物种提供了高质量的栖息地。湿地周围的人为改造，尤其是保护性森林的消失，使这一生态系统在未来的淹没事件中变得脆弱。建立有效的生物保护区需要深入了解淹没事件的频率和强度，以及有效的树种选择及其在生物保护区内的合理配置。在此，我们介绍了所研究湿地的古生物学和考古植物学数据，并将其与当地古海啸数据、以前公布的森林生物保护区数据和传统生态知识相结合，设计、优化和安装了一个 8000 平方米的森林生物保护区，并回顾了这种生物保护区方法的广泛优势和局限性。

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引用次数: 0

Recommendations for a successful assessment of Nature-based Solutions in an urban context. URBAN GreenUP project lessons learnt

Nature-Based Solutions

Pub Date : 2025-02-19 DOI: 10.1016/j.nbsj.2025.100221

Esther San Jose , Bárbara Díez , Silvia Gómez , Raquel Marijuán , Jorge Calvo , Thami Croeser , Trinh Tran Duc , Raúl Sánchez

The whole process of Nature-based Solutions (NbS) implementation is a complex procedure that requires the achievement of many aspects to finish as a successful hit. One of these aspects is the assessment of the value and functionality of the NbS. In this paper, we present a description of the main aspects related to the assessment that are necessary for a successful NbS implementation process. First, we provide an evaluation of the monitoring processes, the performance on the NbS and the assessment of the NbS impact. The European projects framework provides a wide number of examples of NbS implementation and in the case of this paper, as is the case for the project on which this report is based. By considering KPI (Key Performance Indicators) and the NbS efficiency this document delivers an assessment of the impact of NbS and an overview of the final status of the interventions in each of city as demo site in the project. The assessment has been conducted considering two main sources of information: 1) Evaluations developed during the initial phases of the project and the weights assigned to each variable under study, including the prioritization of the KPIs for each NbS implemented in each demo city and the evaluation of the potential impact that those NbS produced on several city challenges. 2) The monitoring of the NbS implemented and data collected, which has provided the assessment of combined impact of each NbS regarding city challenges. Likewise, the paper describes the methodology applied to make the overall assessment of the NbS through the performance of the KPIs. Additionally, we show the data an analysis of the technical, economic, social and environmental barriers, boundaries appeared in the course of KPI monitoring, and NbS implementation phases in demo sites. As conclusion, our work provides a user-friendly assessment methodology that takes into account economic, technical, social and ecological aspects related to NbS implementation processes and that has been validated in real case studies.

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引用次数: 0

Effect of compost and compost-derived biochar on the growth of lettuce irrigated with water and treated wastewater

Nature-Based Solutions

Pub Date : 2025-01-27 DOI: 10.1016/j.nbsj.2025.100220

Panagiotis Regkouzas, Nancy Katie, Konstantinos Bontiotis, Alexandros Stefanakis

As climate change keeps progressing, the use of biochar and compost as nature-based materials emerges as sustainable alternative that can have a positive impact on agriculture. Such valuable organic materials produced from previously considered waste products are increasingly viewed as attractive nature-positive solutions to improve soil quality and fertility that could help in climate change mitigation and address sustainable development goals. In this study, compost and compost-derived biochar were produced from the organic fraction of municipal solid waste and tested as soil amendments for the cultivation of lettuce (Lactuca sativa L), irrigated with both tap water and secondary wastewater effluent. Physicochemical characterization of compost, biochar and soil showed that the investigated materials were not so rich, compared to biochars from different feedstocks but when applied to the soil for lettuce cultivation, they may provide a positive effect. The combined effect of the use of bio-based materials and irrigation with treated wastewater was found to lead to higher soil and crops quality. Longer crop growth cycles are necessary to clearly demonstrate the positive effect of biochar on crop yield. Such materials can effectively be used for sustainable agriculture, contributing to the promotion of nature-based solutions as useful tools that promote circular practices.

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引用次数: 0

Time in and for nature-based solutions. No quick fix solutions for complex ecological and social processes

Nature-Based Solutions

Pub Date : 2025-01-26 DOI: 10.1016/j.nbsj.2025.100219

Ina Lehmann , Julia Grosinger , Steffen Bauer , Jean Carlo Rodríguez de Francisco , Katarzyna Negacz , Jonas Hein

Nature-based solutions (NbS) are an increasingly widespread tool in environment and development policies. They embody the idea that nature and natural processes can be purposefully used by humans to provide solutions to pressing environmental and social challenges. However, their potential to meet this ambition is contested, particularly in terms of the scale of the challenge, the risk of diverting attention from the need for decarbonisation, and examples of poorly implemented NbS projects. A largely overlooked but crucial factor concerning the effectiveness of NbS is time. In response to this gap, we develop a framework for systematising the ecological and social dimensions of time in NbS as well as the distinction between slow and fast processes. On this basis, we gather insights from a systematic literature review on key challenges related to slow and fast processes in both the ecological and social dimensions of time. For instance, the long maturation time of many species and ecosystems may be incompatible with the often short-term logic of NbS projects or with the dynamic character of ecosystems that may be challenging for continuous benefit provision. We also identify practical recommendations from the literature review for incorporating time into NbS design, for instance through adaptive monitoring, and we conclude with an urgent call for a more long-term perspective for NbS policies and practice.

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引用次数: 0

Numerical modelling of the hydrodynamics driven by tidal flooding of the land surface after dyke breaching

Nature-Based Solutions

Pub Date : 2025-01-25 DOI: 10.1016/j.nbsj.2025.100218

Rachel A. Burns , Ryan P. Mulligan , Megan Elliott , Danika van Proosdij , Enda Murphy

Managed dyke realignment is a method of creating more coastal wetland environments, by breaching constructed dykes (levees) to allow seawater driven by tides to flood the land surface and enable re-establishment of salt marshes over time. However, coastal land regions that are protected by dykes experience major hydrodynamic changes after breaching. To investigate these dynamics, a dyke in Atlantic Canada was purposefully breached and the adjacent land surface allowed to flood with the tides. Field measurements pre- and post-breach provide a rare opportunity to model the hydrodynamics of early dyke realignment in a hypertidal estuary in the Bay of Fundy. These include measurements of water levels and current velocities at spring tide collected across of field site. A numerical model with an unstructured flexible mesh (Delft3D-FM) was applied to examine the impacts of tidal flooding from a river channel, through the dyke breach and across the previously agricultural landscape that was historically a salt marsh. The model was used to simulate the hydrodynamics inside and around the breach before and after seawater flooding during spring tides, to evaluate the initial impacts of this nature-based method of managed dyke realignment. The results indicate that the breach was not wide enough to influence water levels within the Missaguash River. The depth-averaged current speeds can exceed 1 m s⁻¹ within the breach and are typically <0.3 m s⁻¹ across the flooded area with an average depth of 0.66 m over the simulation period with six tidal cycles. The model results also highlight the importance of high-resolution computational grids and variable bottom roughness for simulating the hydrodynamics of small-scale salt marsh restoration projects. Overall, the results may provide insight to researchers and practitioners in applying nature-based solutions to improve coastal resilience.

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引用次数: 0

Nature-based solutions for climate change adaptation and resilience in urban informal settlements: Insights from kibera, kenya and Villa 20, Argentina

Nature-Based Solutions

Pub Date : 2025-01-23 DOI: 10.1016/j.nbsj.2025.100216

Caroline Kibii , Flávia Guerra , Philip Bonera Bananayo, Simone Sandholz

Nature-based Solutions (NbS) are gaining much recognition for their contribution to addressing climate change impacts and overall environmental challenges in urban areas. NbS in urban areas have been associated with varied benefits and ecosystem services such as flood management, cooling effects and recreational values. However, implementation and effectiveness are influenced by various factors, such as space availability. In urban informal urban settlements with limited space, and high exposure to climate risks, NbS implementation is particularly challenging, despite their proven benefits. Noting the heterogeneity of informal settlements, understanding the existing NbS and how they are perceived locally is crucial for their uptake. Based on surveys and interviews in the informal settlements of in Kibera (Nairobi, Kenya) and Villa 20 (Buenos Aires, Argentina), implemented NbS, their particular benefits and perception as well as key factors influencing their implementation, effectiveness and acceptance were identified. Lastly, the extent to which the identified NbS can be considered transformative was assessed. A key conclusion of the paper is that despite differences in geographies and upgrading and planning processes in the two settlements, somewhat similar NbS enablers and barriers could be identified. NbS effectiveness and sustainability in urban informal settlements seem realizable with active multi-stakeholder engagements and consistent integration of NbS initiatives into participatory urban planning programs and policies. Looking into NbS dimensions beyond environmental benefits can be particularly helpful to identify barriers, enablers but also transformative potentials, thereby supporting sustainable livelihoods, capacitation and participation of dwellers.

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引用次数: 0