Downstream fining in contrasting reaches of the sand-bedded Yellow River
文献类型：期刊论文
| 作者 | Ta, Wanquan; Wang, Haibin; Jia, Xiaopeng |
| 刊名 | HYDROLOGICAL PROCESSES
 |
| 出版日期 | 2011-11-29 |
| 卷号 | 25期号:24页码:3693-3700 |
| 关键词 | downstream fining fine surface layer coarse subsurface layer fine sand-bedded river Yellow River |
| ISSN号 | 0885-6087 |
| DOI | 10.1002/hyp.8065 |
| 通讯作者 | Ta, Wanquan(tawq@ns.lzb.ac.cn) |
| 英文摘要 | Compared to downstream fining of a gravel-bedded river, little field evidence exists to support the process of downstream fining in large, fine sand-bedded rivers. In fact, the typically unimodal bed sediments of these rivers are thought to produce equal mobility of coarse and fine grains that may discourage downstream fining. To investigate this topic, we drilled 200 sediment cores in the channel beds of two fine-grained sand-bedded reaches of the Yellow River (a desert reach and a lower reach) and identified a fine surface layer (FSL) developed over a coarse subsurface layer (CSL) in the 3-m-thick bed deposits. In both reaches downstream, the thickness of the FSL increased, while that of the CSL decreased. Comparison of the depth-averaged median grain sizes of the CSL and the FSL separately in both reaches shows a distinct downstream fining dependence to the median grain size, which indicates that at a large scale of 600-800 km, the CSL shows a significant downstream fining, but the FSL shows no significant trends in downstream variations in grain size. This result shows that fine sediment supply (<0.08 mm median grain size) from upstream, combined with lateral fine sediment inputs from tributaries and bank erosion, can cause a rapid fining of the downstream channel bed surface and can develop the FSL layer. However, in the desert reach, lateral coarse sediment supply (>0.08 mm median grain size) from wind-borne sediments and cross-desert tributaries can interrupt the FSL and coarsen the channel bed surface locally. Copyright (C) 2011 John Wiley & Sons, Ltd. |
| 收录类别 | SCI |
| WOS关键词 | GRAIN-SIZE ; SELECTIVE DEPOSITION ; SEDIMENTARY LINKS ; FLUME EXPERIMENT ; SURFACE-LAYER ; TRANSPORT ; CHANNEL ; LOAD ; GRAVELS ; STREAMS |
| WOS研究方向 | Water Resources |
| WOS类目 | Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000297247300001 |
| 出版者 | WILEY-BLACKWELL |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2556534 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Ta, Wanquan |
| 作者单位 | Chinese Acad Sci, Cold & Arid Reg Environm & Engn Inst, Key Lab Desert & Desertificat, Lanzhou, Gansu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ta, Wanquan,Wang, Haibin,Jia, Xiaopeng. Downstream fining in contrasting reaches of the sand-bedded Yellow River[J]. HYDROLOGICAL PROCESSES,2011,25(24):3693-3700. |
| APA | Ta, Wanquan,Wang, Haibin,&Jia, Xiaopeng.(2011).Downstream fining in contrasting reaches of the sand-bedded Yellow River.HYDROLOGICAL PROCESSES,25(24),3693-3700. |
| MLA | Ta, Wanquan,et al."Downstream fining in contrasting reaches of the sand-bedded Yellow River".HYDROLOGICAL PROCESSES 25.24(2011):3693-3700. |
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来源：寒区旱区环境与工程研究所
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