Author(s): Koichiro Ohgushi; Kotaro Ikeda; Hiroyuki Araki
Linked Author(s): Koichiro Ohgushi
Keywords: Historic facility for flood control; Flood restraining forest belt; Auxiliary levee; 2-D depth-averaged numerical analysis
Abstract: In the Saga Plain many flood control facilities were built in the Edo period. It is very useful for future flood control technology to clarify those functions. In this study, forests and auxiliary levees for flood damage protection are focused. They are located in the midstream of the Kase River and considered as a historic facility for flood control. At first the study grasps the present conditions and explains these functions by a 2-D depth-averaged numerical analysis on curvilinear coordinate systems successively. As a result, luxuriant growth areas of the forest increase year by year, and water level becomes high at the time of flood in comparison with the past. The water level rising by the forest has much influences upstream water level and flow velocity. Flows gather in low water channel by the forest so that the low water channels are fixed.
Year: 2007