Effect of suspended sediment grain size on channel sedimentation in the lower Yellow River and some implications

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	Effect of suspended sediment grain size on channel sedimentation in the lower Yellow River and some implications
	Xu Jiongxin
	2009
关键词	Catchments Erosion Grain size and shape River control Sediment transport Sedimentation
英文摘要	Based on the data of suspended sediment transport and channel sedimentation in various grain size fractions in the period of 1962-1985, the relationship between channel sedimentation in the lower Yellow River and sediment input has been plotted with respect to each grain size fraction. Several fill-scour thresholds in sediment input have been identified from these graphs. It was found that the fill-scour threshold in sediment input decreases with the increase in fraction grain size. The correlation coefficient between channel sedimentation and sediment input becomes larger with the increasing fraction grain size, indicating that channel sedimentation depends more on coarser grain size fractions than on smaller ones. The fraction channel sedimentation induced by unit change of fraction sediment input increases with grain size. Of the input of sediment larger than 0.025 mm, 43.73% was deposited on the channel, and for inputs of sediments larger than 0.05 mm and larger than 0.10 mm, 76.61% and 97.68% were deposited on the channel, respectively. Thus, for reduction of each ton of sediment larger than 0.10 mm from the drainage basin, the resultant reduction in channel sedimentation in the lower Yellow River would be 1.275 times that for the sediment larger than 0.10 mm, and 2.234 times that for the sediment larger than 0.025 mm. Therefore, if the erosion and sediment control measures are enforced in the areas where >0.05 or >0.10 mm sediment is produced, then the best beneficial will be achieved in reducing sedimentation in the lower Yellow River. © 2009 Science in China Press and Springer-Verlag GmbH.
出处	Science in China, Series E: Technological Sciences
卷	52 期:8 页:2330-2339
收录类别	EI
语种	英语
内容类型	EI期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24470]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Xu Jiongxin. Effect of suspended sediment grain size on channel sedimentation in the lower Yellow River and some implications. 2009.