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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Estimation of drift woods discharge from a-class rivers in the ariake sea by their numerical transpo...
Estimation of drift woods discharge from a-class rivers in the ariake sea by their numerical transport simulation
Author : SHINICHIRO YANO(1), YOHEI KITAGAWA(2), HIROAKI TANIGUCHI(3) , KEISUKE NISHIMURA(4) & SHUNTA DOZONO(5)
ABSTRACT
Woody debris in flood event can cause inundation due to accumulation on a bridge; collapse of a small bridge, and so on.
Drift woods discharged into a coastal area can also cause disturbance in function of port, restriction of small fishery boat
navigation, disorder of cultivation facilities, and so on. Thus, it is strongly required that risk management of drift woods
disaster in overall area from a mountainous river basin to a coastal area. So-called ¡°the Northern Kyushu Heavy Rain in
July, 2012¡± in Japan caused very serious damages in Kyushu area, such as more than 30 victims and big economic loss.
The event also caused many drift woods disasters in river basins and coastal areas. This research focuses on transport of
drift woods in the Ariake Sea due to the rain event. Numerical simulation of their transport by 3D hydrodynamic model
(DELFT3D) combined with assumed drift woods tracking model and comparison between the calculation result and
collection data by Ministry of Land, Infrastructure Transport and Tourism were conducted. From the result, the followings
were clarified: 1) total drift woods volume of discharged from all rivers into the sea was estimated as 17,500m3; 2) volume
of discharged drift woods from each A-class river was estimated; 3) relationship between the volume and specific
maximum river discharge was evaluated.
File Size : 772,639 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 28/08/2015
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