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    Item type:Publication, Access status: without files ,
    Cascading flood compartments with adaptive response
    (WIT Press, 2008)
    Pasche, Erik
    ;
    Ujeyl, Gehad
    ;
    Goltermann, Dagmar
    ;
    Meng, J.
    ;
    Nehlsen, Edgar
    In consequence of the climate change, a sea level rise within the coming decades is highly probable and the intensity of storm surges will probably increase at least in the North Sea region. In this changing environment, great uncertainty exists about the need to adapt conventional coastal flood protection structures. This calls for response strategies to improve the flood resilience behind the dikes, in the Hinterland. Within this paper, the concept of cascading flood compartments is presented as an appropriate strategy to deal with the residual risk in the Hinterland. The key element of this approach is that an overtopping of the main dike line is accepted requiring their enforcement to resist erosion from hydrodynamic loads. Inner dikes are arranged in a multi-layer cascade of compartments creating a redundant system of flood containment. The necessary adaptations and restrictions to the built environment vary from simple resistance measures of dry- and wet-proofing to the development of amphibious settlements with floating homes and houses on piles. The whole concept is illustrated on the island of Wilhelmsburg in Hamburg, where urban areas are protected against storm surges through a ring dike. The necessary storage capacity of the flood compartment system is determined for the climate change scenarios of 2030 and 2085. A realistic arrangement of flood compartments can be found, proving the effectiveness and efficiency of this response strategy. 3d graphics illustrate the transfer from a water-abandoned city to an amphibious city, backing the statement that this flood response strategy opens new opportunities for cities. © 2008 WIT Press.
    Publicationtype: Journal Article
      118
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    Item type:Publication, Access status: without files ,
    Integration of resiliency measures into flood risk management concepts of communities
    (WIT Press, 2008)
    Manojlovic, Natasa
    ;
    Pasche, Erik
    Based on the recent flood events in Europe and following the latest scientific reports on climate change IPCC, and urban development EEA it becomes evident that the areas in Northern and Middle Europe are becoming increasingly affected by flooding. In the changing environment, the conventional flood protection measures are not providing sufficient protection level and are very cost intensive. New strategies to cope with flooding have to be developed and implemented to adapt the communities to climate change in an adequate way. This paradigm shift from "flood fighting" to "living with floods" reflects the current EU Flood Policy formulated in the EU Flood Directive and adopted by national laws. Especially vulnerable are urban areas where the economic growth, in case of extreme flood events, can be irreversibly disrupted. Other than applying mere conventional protection, the innovative resilience concepts should be considered that integrate the building environment into flood protection by improving the resilience performance of the urban fabric and build capacity of stakeholders. In order to optimise the performance of flood protection, as alternative to resiliency measures for each household separately, integrative solutions for the area/city quarter are to be considered. In general, which level of integration is to be implemented depends technical, economic and socio-political criteria. The adopted integration level can in any case be supported by the ad-hock measures that can serve as an intermediate solution and initial phase for active stakeholder involvement. For the historic area of the City of Lauenburg that was recently severely affected by flood events of the river Elbe (2002, 2006), resilience concepts have been developed. Without a solution for flood protection, sustainable development of the city, primarily focused on tourism, cannot be achieved. Different resilience solutions, based on different levels of integration and adaptability are presented and discussed. © 2008 WIT Press.
    Publicationtype: Journal Article
      79