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Building with nature : restoring mangrove coast
Communities in Northern Java, Indonesia are suffering from coastal erosion affecting hundreds of kilometres of coastline. At the north coast of the province of Central Java in the district of Demak more than 3 kilometres of land including entire villages has already been swallowed up by the sea. The main causes of the problem are the removal of mangrove belts for aquaculture development, the construction of coastal infrastructure impacting sediment build-up from offshore sources, river canalisation and land subsidence caused by groundwater extraction. The Building with Nature (BwN) approach was introduced in Demak to address these root causes and mitigate their effects. The approach integrates mangrove and river restoration, small-scale engineering and sustainable land use. Permeable brushwood and bamboo structures have been built to dampen the waves and capture sediment. Once the near shore bed level had risen enough, mangrove seedlings will start to regenerate naturally. Local communities build and maintain these permeable structures through a Bio-rights approach. They are also trained to practice sustainable mixed mangrove-aquaculture, working with probiotics and local food sources. A strategy of learning-by-doing was adopted, where sharing the knowledge and the lessons learnt is supporting sound replication of the BwN approach through capacity building, knowledge exchange and embedding in policies and planning. A lesson learnt is that the land subsidence is more severe than expected which affects the net sedimentation rate behind the permeable structures and slows down the recolonization by mangroves. This lesson is communicated to the communities and policy makers.
The Living Lab for Mud integrated sediment management based on Building with Nature concepts
Integrated sediment management approaches leveraging on Building with Nature (BwN) concepts represents a potentially powerful solution to the enormous world-wide challenges and societal needs concerning growing amounts of sediments. With this in mind, EcoShape initiated the Living Lab for Mud (LLM), an initiative that aims to develop integrated knowledge and technologies to improve understanding and implementation of management, use and reuse of (fine and soft) sediments often linked to the reinforcement, safety and restoration of coastal ecosystems (e.g. salt marshes and mangroves) or land reclamation. The LLM consists of a series of pilot projects within and outside the Netherlands, which integrate the various aspects and processes of sediment management: from sedimentation and resuspension, to fate and transport, to consolidation and strength development. The LLM integrates these physical processes with biota and socio-economic aspects, in order to develop feasible, applicable and sustainable BwN based solutions. Pilots include strategic sediment disposal to naturally nourish coastal mudflats (i.e. Mud Motor, The Netherlands), enhancing sediment trapping to encourage mangroves restoration and coastal aggradation (i.e. Demak, Indonesia), and ripening of fine dredged sediments for production of building material (i.e. Kleirijperij, The Netherlands). This presentation will introduce the LLM initiative and give an overview of these pilot projects.
Building for Nature : preserving threatened bird habitat in port design
The fast economic development of the People’s Republic of China has created an increasing demand for usable land, resulting in large-scale land reclamations along the coastal zone. One of these regions is Tongzhou Bay (Jiangsu coast), a region characterized by large intertidal mudflats and deep tidal channels with potential for the development of agri-aquaculture and the construction of a deep-sea port. However, these intertidal mudflats also provide vital ecosystem services and support many wildlife species, including several endangered migratory shorebirds within the East Asian–Australasian Flyway. With increasing realization of the importance of maintaining such ecological values, a more integrated coastal development strategy is needed. This study aims to develop a sustainable integrated design for the Tongzhou Bay port, following a “Building with Nature” approach. We use a morphodynamic model to compute habitat suitability for two shorebird species. Several port configurations were developed on the basis of three design criteria: (1) create area for future port development, whilst (2) preserving existing high-value ecotopes for shorebirds and (3) enhance the natural accretion rate of such ecotopes. Simulation results showed a clear dierence in siltation patterns, preservation and enhancement of preferred ecotopes. This work therefore demonstrates the potential and importance of morphological and habitat suitability modelling when designing large-scale reclamations and port constructions, especially in dynamic areas such as Tongzhou Bay.
Ecosystem-based adaptation using Building with Nature : towards resilient coasts in Indonesia
This project involves the restoration of tropical muddy mangrove coasts linking up coasts and catchments and work on technical coastal measures in combination with alternative livelihoods, with strong support from local communities.
Sandy strategies for resilience : lessons learned from BWN
Amongst the various Nature-Based Solutions (NBS) for flood defenses, sandy strategies are well-known and applied regularly in sandy coastline systems to counter or compensate erosion. However, this is only part of the possibilities that sandy strategies offer as they provide additional benefits by bringing new habitats and supporting biodiversity and recreational areas through the active development of ecosystems ranging from new dunes to foreshores. Several sandy strategies have been piloted in the Netherlands by the EcoShape consortium, a Dutch consortium on NBS knowledge development termed Building with Nature (BWN), in order to establish a knowledge base regarding the full palette of opportunities for sandy strategies. It was found that although the studied cases operate very differently and have inherent differences in supplying and using (ecosystem) functions, and that their feasibility is strengthened by the availability of sand and an appreciation for the strategy's long term flexibility and contribution to (coastal) resilience.
Groene waterbouw, blauwdruk voor de toekomst
Toenemende aandacht voor natuur en duurzaamheid leidt tot en stijgende vraag naar bouwen met respect voor en liefst versterking van natuurwaarden. De Nederlandse waterbouwsector speelt op de vraag in, onder andere door krachten en kunde te bundelen in het innovatieprogramma Building with Nature.
Building with Nature: a future proof strategy for coping with a changing and uncertain world : working with uncertainties
The influence of climate change on water related management challenges is felt worldwide. Backed by policies such as the European Green Deal, the UN Sustainable Development Goals and the Paris Agreement, there is a growing focus on Nature-based Solutions (NBS) and Building with Nature (BwN) to tackle current global challenges. However, the choice to implement Building with Nature rather than a traditional ‘grey’ infrastructure solution is often hampered by greater perceived uncertainty in the performance and implementation of Building with Nature. At the same time, the co-benefits of Building with Nature are well documented, and an increasing body of evidence showcases the value and functioning of Building with Nature under both daily and extreme conditions. The objective of this whitepaper is to inform practitioners of Building with Nature about the concepts of uncertainty and how to use this as a strength in the dialogue to come to sustainable solutions for coping with future global change related uncertainties.
Coastal engineers embrace nature : characterizing the metamorphosis in hydraulic engineering in terms of four continua
Hydraulic engineering infrastructures, such as reservoirs, dikes, breakwaters, and inlet closures, have significantly impacted ecosystem functioning over the last two centuries. Currently, nature-based solutions are receiving increasing attention in hydraulic engineering projects and research programs. However, there is a lack of reflection on the concomitant, fundamental changes occurring in the field of hydraulic engineering, and coastal engineering in particular, and what this could mean for sustainability. In this article, we signal the shift from conventional to ecosystem-based hydraulic engineering design and characterize this in terms of four continua: (i) the degree of inclusion of ecological knowledge, (ii) the extent to which the full infrastructural lifecycle is addressed, (iii) the complexity of the actor arena taken into account, and (iv) the resulting form of the infrastructural artefact. We support our arguments with two carefully selected, iconic examples from the Netherlands and indicate how the stretching ideals of ecosystem-based engineering could engender further shifts towards sustainability.
Evaluatie 'building with nature' showcase Dordrecht, Stadswerven : showcase in het kader van Bouwen met Natuur: Kennisvalorisatie Ecoshape
De showcase Stadswerven heeft als doel om aan te tonen dat het Building with Nature (BwN) concept werkt in een stedelijke omgeving. Daarnaast is onderzocht in hoeverre bestaande BwN-concepten toepasbaar zijn in een stedelijke omgeving en wat de maatschappelijke meerwaarde van BwN-concepten is. In dit kader hebben EcoShape-partners Deltares en Witteveen+Bos in de periode januari 2014-december 2015 de gemeente Dordrecht ondersteund bij planvorming en ontwerp voor een deel van het ontwikkelingsgebied Stadswerven. Op basis van de resultaten van een systeemanalyse zijn voor de deellocaties Wervenpark, de insteekhaven en de tussenoever met aanlegsteiger voor de waterbus suggesties gedaan voor uitgangspunten voor het ontwerp en concrete elementen in het ontwerp.
Building with Nature pilot Zandmotor Friese IJsselmeerkust : hoe effectief is de zandmotor als ecodynamische strategie voor het versterken van de Friese IJsselmeerkust?
Dit rapport beschrijft de resultaten van de monitoring van de Building with Nature pilot langs de Friese IJsselmeerkust in de periode 2011 t/m 2015. De monitoring van de experimenten met zandmotoren bij Workum en Oudemirdum is gericht op het begrijpen van het gedrag van de zandmotor, de effecten op de kust en op de ecologie. De monitoring loopt door tot en met 2017, dit rapport is dan ook te beschouwen als een tussenstand. Omdat er in 2016 een MIRT-pre-verkenning start met als doel het vaststellen van compenserende maatregelen langs de Friese IJsselmeerkust voor het veranderende peilregime van het IJsselmeer is het opportuun om nu met deze tussenstand van monitoringsresultaten te komen. In 2017 worden de definitieve resultaten gepubliceerd.