Author(s): Yonghui Zhu; Hongyan Yue; Qingbiao Lv; Caiyun Deng

Linked Author(s): Yonghui Zhu

Keywords: Bank collapse; Water level fluctuation; Slope ratio; Flow scouring

Abstract: The mechanism of river bank collapse is very complicated. This research focuses on water level fluctuation process and bank slope, and the influence of the above two factors on river bank collapse is studied through flume tests. The tests consider two different slope ratios of 1:1 and 1:2, as well as two flow conditions of the same rising water process and different rates of falling water process. The preliminary analysis of the test results showed that, under the same flow condition, slope ratio has a significant impact on bank collapse, and the larger the bank slope ratio is, the more serious the collapse failure is. The process of water level fluctuation has important influence on bank collapse. When the water level rises gradually from the low water level, the intensity of bank collapse increases gradually, and the maximum intensity of bank collapse occurs in the flood period (much larger than the rising and falling periods). While in the water level falling period, the frequency and scale of river bank collapse are obviously larger in the water level steep drop condition compared with the water level slow drop condition. Bank collapse mainly occurs in the middle and downstream parts of the concave bank of the river bend.

DOI: https://doi.org/10.3850/978-90-833476-1-5_iahr40wc-p1420-cd

Year: 2023