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Mitigation of destructive fluid force on buildings due to trapping of floating debris by coastal forest during the Great East Japan tsunami

Content Provider	Springer Nature Link
Author	Tanaka, rio Onai, Aki
Copyright Year	2016
Abstract	The effectiveness of coastal or inland forests in trapping floating debris produced by destructive tsunamis has long been discussed but never clarified quantitatively. To estimate the effectiveness, especially in reducing the damage to wooden buildings (houses) behind the forest, a nonlinear long wave equation model that includes not only destruction of the coastal forest but also a trap mechanism has been developed, and a simulation was conducted where trapping was observed during the 2011 Great East Japan tsunami. A post-tsunami survey of Sendai City showed that some houses just behind the coastal forest remained, although the inland-side houses were washed out. Based on the damage to houses, fragility curves as a function of moment by fluid force were analyzed. Although only the fringe of a coastal forest increases the fluid force due to a tsunami current concentration where a coastal forest is damaged, analyses using the model with and without the trapping function suggest that the debris-trapping function of a coastal forest greatly mitigates the damage observed in the post-tsunami survey, not only just behind the forest, but further inland, at around 1300 m from the coast. By including the trapping effect, the inundation height can be well reproduced, especially at around 2000–3000 m. The fluid force reduction was increased inland because some houses there remained standing in the tsunami and maintained resistance to the current.
Starting Page	131
Ending Page	144
Page Count	14
File Format	PDF
ISSN	18601871
Journal	Landscape and Ecological Engineering
Volume Number	13
Issue Number	1
e-ISSN	1860188X
Language	English
Publisher	Springer Japan
Publisher Date	2016-08-22
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bioshield Trapping effect Washout Critical moment Fragility curve Landscape Ecology Nature Conservation Civil Engineering Environmental Management Landscape/Regional and Urban Planning Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Management, Monitoring, Policy and Law Nature and Landscape Conservation

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