土砂移動・河床変動 (3)

[II-214] Analysis of flusing of the river mouth sandbar by the 2014 Flood of the Monobe River

*立山 政樹¹、久保 宜之²、バック　シー ハイ³、竹村 吉晴⁴、福岡 捷二⁴ (1. 建設技術研究所、2. 国土交通省　高知河川国道事務所、3. 中央大学大学院、4. 中央大学研究開発機構)

Keywords:the Monobe River, flood flows, rivermouth sandbars, gravel-bed river, Q3D-FEBS

In this paper, we analyzed the flashing of river mouth sandbar by the 2014 flood of the Monobe River, and examined the opening mechanism of the river mouth. The flushing of the sandbar consisting of sand and gravels does not occur in a short time due to the flow overflowing the rsandbars, but is caused by sidebank erosion gradually.