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The main-channel restoration objective and the relevant flow regime required for the lower Yellow River.
- Source :
-
Chinese Science Bulletin . Nov2006 Supplement, Vol. 51, p210-217. 8p. 1 Chart, 9 Graphs. - Publication Year :
- 2006
-
Abstract
- The main-channel of the lower Yellow River is the main path of water and sediment transportation. In this paper, we put forth a suggestion that the bank-full discharge of the main-channel in the lower Yellow River should be no less than 4000 m³/s, which is based on the demand from effective sediment transportation (or riverbed scouring), the demand of flood control on morphology of the cross section of the main-channel, and the possible riverbed-forming force of future flood. The forming of the main-channel is the process for the flood force to overcome the resistance from the riverbed. The forming of the main-channel configuration comes from the competition between riverbed-forming force of flood and resistance from the riverbed. Regarding the flood with medium or less sediment content and without floodplain inundated, the main-channel forming mechanism can be simplified as the relationship between the change of cross section area and WαQβ. For forming same main-channel, the needed flood force W0.32Q0.37 is definite, i.e., when the discharge is large, the flood volume can be smaller; if some flood is able to scour the main-channel, its force W0.32Q0.37 should be larger than 41. Not all floods that inundate floodplain have the function of silting in floodplain and scouring main-channel. Regarding flood with medium or less sediment content, only when the flood discharge is over 1.5 times of the relevant bankfull discharge, obvious scouring effect can occur in the main-channel. [ABSTRACT FROM AUTHOR]
- Subjects :
- *RIVER channels
*RIVER sediments
*FLOODPLAINS
*FLOOD control
*FLOODS
Subjects
Details
- Language :
- English
- ISSN :
- 10016538
- Volume :
- 51
- Database :
- Academic Search Index
- Journal :
- Chinese Science Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 23995768
- Full Text :
- https://doi.org/10.1007/s11434-006-8210-3