A quantitative assessment of human impacts on decrease in sediment flux from major Chinese rivers entering the western Pacific Ocean
A quantitative assessment of human impacts on decrease in sediment flux from major Chinese rivers entering the western Pacific Ocean
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DOI：
10.1029/2009gl039513
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发表时间：
2009-10-09
影响因子：
5.2
通讯作者：
Xu, K. H.
中科院分区：
文献类型：
--
作者：
Chu, Z. X.;Zhai, S. K.;Xu, K. H.
具有高沉积物或水流量的主要河流是其流域内包括人类活动在内的表面变化过程的自然组成部分，它们也是进入海洋的陆地物质的主要来源。然而，进入沿海海洋的河流物质通量受到人类活动的强烈影响。最近有关人类对河流沉积物通量影响的研究主要集中在定性描述上。本文对长江、黄河、珠江、松花江、辽河、海河、淮河、钱塘江和闽江等9条进入西太平洋的主要河流的泥沙通量减少的人为影响进行了定量评估。在1959-2007年期间，水坝和水库、水土保持计划、水消耗以及采砂分别减少了28、11.5、7.5和3千兆吨（Gt）的沉积物。如果加在一起（1959-2007年期间为50亿吨），这一减少接近于同期这九条主要河流测量的总减少的沉积物通量（43亿吨）。此外，还分析了1953-2007年间这些河流入海水沙通量的时间变化。这些结果对进一步研究中国乃至全球河流入海物质通量及其生态风险具有重要意义。引文：Chu，Z. X.，S. K. Zai，X. X.卢俊平，刘俊雄。Xu和K. H. Xu（2009），A quantitative assessment of human impacts on decrease in sediment flux from major Chinese rivers entering the western Pacific Ocean，Geophys.保留信函：36，L19603，doi：10.1029/2009GL039513。
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. Citation: Chu, Z. X., S. K. Zhai, X. X. Lu, J. P. Liu, J. X. Xu, and K. H. Xu (2009), A quantitative assessment of human impacts on decrease in sediment flux from major Chinese rivers entering the western Pacific Ocean, Geophys. Res. Lett., 36, L19603, doi:10.1029/2009GL039513.