Analysis of controls upon channel planform at the First Great Bend of the Upper Yellow River, Qinghai-Tibet Plateau
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文摘
The 270 km long section of the Upper Yellow River at the First Great Bend is comprised of single channel and multiple channel systems that alternate among anastomosing, anabranching, meandering and braided reaches. The sequence of downstream pattern changes is characterized as: anastomosing-anabranching, anabranching-meandering, meandering-braided and braided-meandering. Remote sensing images, DEM data and field investigations are used to assess and interpret controls on these reach transitions. Channel slope and bed sediment size are key determinants of transitions in channel planform. Anastomosing reaches have a relatively high bed slope (0.86‰) and coarser sediment bed material (d_(50)=3.5 mm). In contrast, meandering reaches have a low slope (0.30‰) and fine sediment bed material (d_(50)=0.036 mm). The transition from a meandering to braided pattern is characterized by an increase in channel width-depth ratio, indicating the important role of bank strength (i.e. cohesive versus non-cohesive versus channel boundaries). Interestingly, the braided-meandering and meandering-braided transitions are coincident with variable flow inputs from tributary rivers (Baihe and Heihe rivers respectively). Theoretical analysis of the meandering-braided transition highlights the key control of channel width-depth ratio as a determinant of channel planform.
来源
Journal of Geographical Sciences
,2013,23(5):833-848 【核心库】
DOI
10.1007/s11442-013-1047-1
关键词
Yellow River Source
;
river pattern diversity
;
river pattern transition
;
anastomosing river
;
anabranching river
;
meandering river
;
braided river
地址
1.
Tsinghua University, State Key Laboratory of Hydroscience and Engineering, Beijing, 100084
2.
Changjiang River Scientific Research Institute, Wuhan, 430010
3.
School of Environment, University of Auckland, State Key Laboratory of Hydroscience and Engineering, Beijing, 92019
4.
School of Environment, University of Auckland, New Zealand, Auckland, 92019
5.
Institute of Geographic Sciences and Natural Resources Research, CAS, Key Laboratory of Water Cycle and Related Land Surface Processes, CAS, Beijing, 100101
语种
英文
文献类型
研究性论文
ISSN
1009-637X
学科
地球物理学
基金
International Science & Technology Cooperation Program of China
;
清华大学基金
;
国家自然科学基金
文献收藏号
CSCD:5021274
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42
共3页
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