Evolution of mid-channel bars in a braided river and complex response to reservoir construction: an example from the middle Hanjiang River, China
✍ Scribed by Jiongxin, Xu
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 307 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0360-1269
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✦ Synopsis
Using the middle Hanjiang River as an example, this paper deals with the development of mid-channel bars in a braided river, as controlled by channel boundary conditions, runoff and sediment load, as well as reservoir construction. Relations have been established between indices describing the mid-channel bars and the controlling variables, such as the channel width, the percentage silt-clay content in the channel boundary and the energy expenditure of flowing water. Bank erosion exerts a marked influence on the development of mid-channel bars after reservoir construction. Bank erosion provides space and material for mid-channel bar formation, so bank erosion rate can be closely related to mid-channel bar indices. The middle channel bars exhibit a complex evolutionary response to the reservoir-regulated hydrological regime in the middle Hanjiang River. A descriptive model showing the complex response has been established.