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- Title
河床横向摆动计算方法及其在黄河下游游荡段的应用.
- Authors
夏军强; 王英珍; 李 涛; 李 洁
- Abstract
Lateral channel deformation including thalweg migration and main-channel migration can lead to remarkable channel adjustments, which has an important influence to the flood control and riparian land use. To propose a method to calculate channel migration is of crucial importance to investigate the lateral channel deformation and full riverbed evolution. In this study, a method to calculate quantitatively the magnitude and rate of channel migration was proposed by using the data of remote sensing images, observed cross-sectional profiles and a reach-average approach, and then the proposed method was applied to calculate the channel migration in the braided reach of the lower Yellow River from 1986 to 2016. It is found that the widths and intensities of thalweg migration and main-channel migration are decreased dramatically after the operation of the Xiaolangdi Reservoir, and it is also discovered that the average widths of thalweg migration and main-channel migration are reduced from 234 and 410 m/a during the pre-dam period(1986-1999) to 119 and 185 m/a during the post-dam period(1999-2016), with a reduction of 49% and 55% respectively. The incoming flow and sediment regime is a dominant factor to influence both thalweg migration and main-channel migration, with the average fluvial erosion intensity being regarded as the key flow and sediment factor. Thalweg migration and main-channel migration are two different aspects in channel migration, but there exists an essential difference between them. The large-scale main-channel migration will certainly cause thalweg migration, whereas thalweg migration will not necessarily cause the migration of main-channel.
- Publication
Yellow River, 2019, Vol 41, Issue 10, p94
- ISSN
1000-1379
- Publication type
Article
- DOI
10.3969/j.issn.1000-1379.2019.10.016