A quantitative assessment of human impacts on decrease in sediment flux from major Chinese rivers entering the western Pacific Ocean

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	A quantitative assessment of human impacts on decrease in sediment flux from major Chinese rivers entering the western Pacific Ocean
	Chu Z. X. ; Zhai S. K. ; Lu X. X. ; Liu J. P. ; Xu J. X. ; Xu K. H.
	2009
关键词	Catchments Reservoirs (water) Rivers Sedimentology Soil conservation Water conservation Water supply
英文摘要	Major rivers with high sediment or water discharge act as natural integrators of surficial processes, including human activities within their drainage basins, and they are also the primary sources of terrestrial materials entering the ocean. The river-derived materials flux entering the coastal oceans, however, has been strongly affected by anthropogenic activities. Recent studies related to human impacts on river sediment flux have mainly focused on qualitative descriptions. Here we present a quantitative assessment of human impacts on decrease in sediment flux from nine major Chinese rivers entering the western Pacific Ocean, including Changjiang (Yangtze), Huanghe (Yellow), Zhujiang (Pearl), Songhuajiang, Liaohe, Haihe, Huaihe, Qiantangjiang, and Minjiang. During 1959-2007, dams and reservoirs, soil and water conservation programs, water consumption, as well as sand mining decreased the amount of sediment delivered to the ocean by 28, 11.5, 7.5 and 3 gigatons (Gt), respectively. If combined (50 Gt for the period 1959-2007), this reduction was close to the total decreased sediment flux (43 Gt) measured from these nine major rivers over the same period. Besides, the temporal variations in water and sediment fluxes into the ocean from these rivers generally during 1953-2007 were presented. These results are useful for further studies on Chinese and even global river-derived material flux to the ocean and associated ecological risks. Copyright 2009 by the American Geophysical Union.
出处	Geophysical Research Letters
卷	36 期:19
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/311030/24975]
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	Chu Z. X.,Zhai S. K.,Lu X. X.,et al. A quantitative assessment of human impacts on decrease in sediment flux from major Chinese rivers entering the western Pacific Ocean. 2009.