Why the world needs floating cities (9 minutes talk for TEDx Delft)

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Rutger De Graaf-van Dinther

Technology

Why the world needs floating cities (9 minutes talk for TEDx Delft)

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Tunnels in water are by no means new in civil engineering. Since about 1900, more then 100 immersed tunnels have been constructed. Bridges are the most common structures used for crossing water bodies. In some cases immersed tunnels also used which run beneath the sea or river bed. But when the bed is too rocky ,too deep or too undulating submerged floating tunnels are used . The Submerged Floating Tunnel concept was first conceived at the beginning of the century, but no actual project was undertaken until recently. As the needs of society for regional growth and the protection of the environment have assumed increased importance, in this wider context the submerged floating tunnel offers new opportunities. The submerged floating tunnel is an innovative concept for crossing waterways, utilizing the law of buoyancy to support the structure at a moderate and convenient depth .The Submerged floating Tunnel is a tube like structure made of Steel and Concrete utilizing the law of buoyancy .It supported on columns or held in place by tethers attached to the sea floor or by pontoons floating on the surface. The Submerged floating tunnel utilizes lakes and waterways to carry traffic under water and on to the other side, where it can be conveniently linked to the rural network or to the underground infrastructure of modern cities.

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Presentation by Barbara Dal Bo Zanon and Rutger de Graaf on the potential of floating production of energy and food to close carbon and nutrient cycles and achieve more resilience in coastal delta cities. First part of the presentation is based on publication by Dal Bo Zanon et al (2017) in the Journal of Cleaner Production. Second part of the presentation on how we translate our research findings in design concepts and real floating projects such as Floating Pavilion in Rotterdam and the Floating Island Project in French Polynesia.

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In the center of Rotterdam lies an eye-catching building: a floating complex made of three sphere-like structures, attached to a floating square. Being a pilot project it consists of state-of-the-art techniques in the area of floating and sustainable development. It paves the way for climate proof urbanization on the water. In this brochure you will find all sorts of information about the Floating Pavilion project. What makes this building so special? Why was it built in the fi rst place? This brochure provides you with information on history, research, development strategy, starting points and realization.

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DeltaSync completed the preliminary concept in December 2013. In our vision, the city is composed of modular platforms – either 50 x 50 meter squares, or pentagons with 50 meter sides. Squares and pentagons can be connected and arranged in numerous branch like structures. Squares are estimated to cost approximately $15 million each. This is equivalent $393 per square foot of gross space. But since 20% of each platform is reserved for open/green space, the report projects issuable space to cost $504 per square foot ($5425/square meter). Reinforced concrete was chosen as the construction material of choice for its price and durability. Concrete structures would be molded into sturdy hollow boxes, or “caissons”. Modules would support three story buildings. The design takes into account apartments, terraced housing, office space, and hotels. This concept is based on 11 modules, which could host 225-300 full-time residents when combined, with an additional 50 hotel beds. The total projected cost would therefore be approximately $167 million. This concept also assesses a scaleable method of financing a breakwater, which could eventually surround the city and allow it to move out to the open ocean. Mobility of the individual modules is key from the perspective of guaranteeing autonomy for the city – in the event that the relationship with a particular host nation no longer suits either party, the platforms could detach from their moorings and float to a different location. Modularity and mobility also enable dynamic geography and empower citizens of the city to rearrange into more desirable configurations as the population grows and evolves.

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This presentation elaborates on the strategies and measures that can be applied in cities to become flood resilient. The presentation was initially part of my Inaugural Lecture at Rotterdam University of Applied Science in November 2012, but I removed it due to time restrictions. Next to my work on floating cities I also work on transformation of land based cities into floodproof eco cities. This presentation contains results from teh EU FP7 project FloodProBe en the work we did for waterboards in the Netherlands.

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Cities in delta areas are threatened by the impacts of climate change, urbanization and land subsidence. In this presentation, the concept of ‘Flood-proof Ecocity’ has been introduced to cope with the expected challenges and to summarize recent debates about future water cities. In a ‘Flood-proof Ecocity’ urban water systems are used as a source of energy, nutrients and local water supply. There is an important role for citizens as co-producers of the urban space. Citizens will also be involved in local water supply and energy production. Surface water in Flood-proof Ecocities is used for a wide variety of functions including floating buildings and water-based urban transport. The water manager is involved from the beginning of spatial developments. To adapt cities to extreme weather events and flood risk, flood control is integrated with urban development and urban renewal. Next to technical and design elements, this presentation has presented multiple building blocks that are needed for the governance of Flood-proof Ecocities. Important elements include: improving stakeholder receptivity, improving the competitiveness of innovations, creating a commercial markets for innovations, introducing new institutional mechanisms and facilitating new roles for citizens, technical professionals and designers.

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Urban systems contain assets of high value, complex and interdependent infrastructure networks. These infrastructure networks are critical for the continuity of economic activities as well as for the people’s basic living needs. Hotspot buildings are essential nodes in critical infrastructure on which urban areas depend for their functioning. This article evaluates the feasibility and effectiveness of several concepts of flood proofing vulnerable hotspots buildings. For this purpose a design tool has been made to assist designers and decision makers in selecting and evaluating flood proofing concepts. Flood characteristics, building characteristics and location characteristics are used as input for the evaluation of the effectiveness of flood proofing hotspots with regard to costs and other relevant aspects.

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This is my Inaugural Lecture about the Blue Revolution. It shows that we need to ralize urban expansions on the water and combine this with floating food production and floating algae biofuel production to deal with the challenges of the 21st century. Much of the work was developed with my colleagues at DeltaSync. We want to collaborate with people all over the world to develop pilot projects and expand on the water in a sustainable way. it goes much further than being self-sufficient. The purpose is to create a symbiosis between cities on land and water. Floating cities could use the waste CO2 and nutrients of land based cities in a productive way, providing at the same time affordable flood proof housing for the people. Most of the building blocks are there. We need to bring it together to make the next step. Because only a small part of the ocean is needed, the rest can become a nature reserve giving marine ecosystems a long term perspective on survival. A perspective that is currently lacking. We look forward to receive comments and ideas. Best regards, Rutger de Graaf

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