Based on available knowledge and the field evidence from the latest extreme wave events, the interaction of coastal forests and tsunami as well as storm waves still needs further study directed towards an improved understanding of the attenuation performance of coastal forests and the development of reliable prediction models. The objective is to improve the understanding of the physical processes associated with the energy attenuation of tsunami and storm waves through coastal forests by developing a generic methodology for the parameterization of 3-D complex typical coastal forest vegetations and by performing physical laboratory experiment and numerical modelling. To achieve this objective, two typical coastal forest vegetations (mangroves and coastal pines) representing two different coastal habitats were selected. A physically-based parameterization using easily quantifiable parameters of the real tree was carried out and tested in a current flume for both stiff and flexible structure assumptions. Following the parameterization stage, large scale model tests with different model setups and wave conditions (solitary waves representing tsunami and regular/irregular waves representing storm waves) were simultaneously performed in the Twin Wave Flume of Leichtweiß-Instituts (LWI) to investigate the hydraulic performance and the hydraulic resistance characteristics of the coastal forest models. Furthermore, an empirical relationship (forest width factor) and a new procedure to assess tsunami attenuation by coastal forests have also been succesfully developed based on numerical simulation using the nonlinear shallow water equation model with hydraulic resistant coefficients obtained from the laboratory experiments. It can, therefore, be used as a practical tool in coastal zone management to evaluate feasible measures in mitigating and managing risks associated with tsunami and storm waves, particularly in the regions where coastal forests are favourable.


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    Title :

    Attenuation of Solitary Waves and Wave Trains by Coastal Forests


    Additional title:

    Dämpfung von Solitären Wellen und Seegang durch Küstenwälder


    Contributors:

    Publication date :

    2013



    Type of media :

    Miscellaneous


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    DDC:    627





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