NDLI: Comparison of reduction of tsunami fluid force and additional force due to impact and accumulation after collision of tsunami-produced driftwood from a coastal forest with houses during the Great East Japan tsunami

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Comparison of reduction of tsunami fluid force and additional force due to impact and accumulation after collision of tsunami-produced driftwood from a coastal forest with houses during the Great East Japan tsunami

A proposal for assessing the success of soil bioengineering work by analysing vegetation: results of two case studies in the Italian Alps

Evolution of land use-change modeling: routes of different schools of knowledge

Acknowledgments

Landscape and Ecological Engineering : Volume 13, Issue 1, January 2017

Landscape and Ecological Engineering : Volume 12

Landscape and Ecological Engineering : Volume 11

Landscape and Ecological Engineering : Volume 10

Landscape and Ecological Engineering : Volume 9

Landscape and Ecological Engineering : Volume 8

Landscape and Ecological Engineering : Volume 7

Landscape and Ecological Engineering : Volume 6

Landscape and Ecological Engineering : Volume 5

Landscape and Ecological Engineering : Volume 4

Landscape and Ecological Engineering : Volume 3

Landscape and Ecological Engineering : Volume 2

Landscape and Ecological Engineering : Volume 1

Comparison of reduction of tsunami fluid force and additional force due to impact and accumulation after collision of tsunami-produced driftwood from a coastal forest with houses during the Great East Japan tsunami

Content Provider	Springer Nature Link
Author	Tanaka, rio Ogi, Kazuyoshi
Copyright Year	2017
Abstract	Coastal forests on the Sendai Plain reduced the force of the 2011 Great East Japan tsunami, but the tsunami also produced driftwood that increased the impact force or additional drag force due to accumulation in front of houses (damming). The advantage of reducing the tsunami force and disadvantage of increasing the force on houses after collisions of driftwood were repeatedly pointed out after the tsunami, but have never been compared quantitatively. Therefore, a driftwood model was developed to evaluate tree washout, motion of the drifting trees, and collisions with houses. Two-dimensional non-linear long wave equations were coupled with the equation for motion of driftwood, and the impact force was solved assuming the collision to be inelastic. Experiments were conducted to clarify the driftwood movement and determine the impact duration in the simulation. The ratio of the impact force of driftwood to the maximum drag force on a house was comparatively small, around 0.01–0.10. On the other hand, when driftwood piled up in front of a house, the increasing water depth caused additional fluid force. The rate of accumulation of driftwood was not large in experiments, but the magnitude of the drag force increase after accumulation was far larger than that of the impact force of collision. However, in comparison with the reduction of fluid force by the coastal forest, the fluid force due to the damming in front of a house was found to be smaller and not a main factor in the washout of houses.
Starting Page	287
Ending Page	304
Page Count	18
File Format	PDF
ISSN	18601871
Journal	Landscape and Ecological Engineering
Volume Number	13
Issue Number	2
e-ISSN	1860188X
Language	English
Publisher	Springer Japan
Publisher Date	2017-03-07
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inundation Bioshield Drag force Damming 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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Comparison of reduction of tsunami fluid force and additional force due to impact and accumulation after collision of tsunami-produced driftwood from a coastal forest with houses during the Great East Japan tsunami

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