北川の大規模河川改修が川坂地区の砂州地形と流況に及ぼす影響
キーワード:
River improvements,
sand-bar,
topographical changes,
simulation of 2-D riverbed evolution,
flow resistance
2011 年 17 巻 p. 143-148
詳細
2011 年 17 巻 p. 143-148
The heavy rainfall by Typhoon No.19 in 1997 caused severe flooding, resulting in severe damage to the Kita River in the northern part of Miyazaki Prefecture, Japan. Sand-bars were excavated to enlarge the conveying cross section of the river channel as a special emergency project. Large amounts of sand gravels have been accumulated on the excavated area due to several floods after improvement works.
In this paper, changes of topographical features of an excavated sand-bar due to floods were examined. In addition, future topographical changes of the sand-bar were numerically simulated using the 2-D riverbed evolution analysis and it was considered that the amount of accumulated sand gravels reaches to over 2.0 m in height due to four times of floods.
