Rapid response of the Changjiang (Yangtze) River and East China Sea source-to-sink conveying system to human induced catchment perturbations
Rapid response of the Changjiang (Yangtze) River and East China Sea source-to-sink conveying system to human induced catchment perturbations
复制标题
长江和东海源汇输送系统对人为流域扰动的快速响应
DOI：
10.1016/j.margeo.2019.05.003
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发表时间：
2019-08
期刊：
影响因子：
2.9
通讯作者：
Gao Shu
中科院分区：
文献类型：
--
作者：
Gao Jian Hua;Shi Yong;Sheng Hui;Kettner Albert J.;Yang Yang;Jia Jian Jun;Wang Ya Ping;Li Jun;Chen Yining;Zou Xinqing;Gao Shu
为了研究长江-东中国海源汇输运系统的人类影响，分析了河口陆架沉积系统的淤积和侵蚀状态，讨论了长江水下三角洲及其相关的长江远岸泥沙沉积系统的响应强度和时间。结果表明，三峡大坝2003年投入运行后，入库泥沙骤减，扰乱了河口-海岸-陆架沉积体系之间的平衡，改变了淤积-侵蚀平衡和海底泥沙类型。从长江水下三角洲到其远岸泥质区，对集水区变化的响应程度逐渐减小，远岸泥沙从北向南的响应滞后较大。受坝址影响，长江-东海中国源汇输运系统的变迁可分为3个阶段，即1950年前、1950-2002年和2003年后。1950年前，源汇系统保持相对稳定。在1950至2002年间，人为的河流蓄水为上游地区的陆源沉积物创造了一个重要的汇，但没有发生深刻的系统变化。2003年后，整个长江中下游、水下三角洲和远岸泥沙的地貌动力格局在短时间内从淤积迅速转变为侵蚀。此外，河流上游与源汇输送系统断开，河流中下游及其水下三角洲和北部远岸泥质区被转化为净泥沙来源。因此，长江-东海中国源汇输送系统的汇区缩小，源区扩大。
In order to investigate human impact in the Changjiang – East China Sea source to sink conveying system, we analyze the siltation and erosion state of the estuary-shelf deposition systems, and discuss the response intensity and timing of the depositional system of the Changjiang subaqueous delta and the related Changjiang distal mud. Results show that after the Three Gorges Dam was put into operation in 2003, the abrupt reduction of the sediment discharge to the estuary disturbed the equilibrium between the estuary-coast-shelf deposition systems, modifying the siltation-erosion balance and seabed sediment types. From the Changjiang subaqueous delta to its distal mud areas, the degree of response to catchment changes diminishes, with a larger response lag from north to south of the distal muds. Influenced by dam emplacements, the change of the Changjiang – East China Sea source to sink conveying system can be divided into three stages, i.e., pre-1950, 1950–2002 and post-2003. Before 1950, the source to sink system remained relatively stable. Between 1950 and 2002, man-made fluvial impoundments created an important sink for terrigenous sediment of the upstream regions, but without profound system changes. In contrast, after 2003, the morphodynamic patterns for the entire mid-lower reaches of the Changjiang River, the subaqueous delta and the distal muds shifted rapidly from siltation to erosion within a short period of time. Furthermore, the upper reaches of the river became disconnected from the source to sink conveying system, and the mid-lower reaches of the river, together with its subaqueous delta and northern distal mud area were converted into net sediment sources. As such, the sink area has shrunk while the source area expanded for the Changjiang – East China Sea source to sink conveying system.
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影响因子：
4.6
作者：
Liu JT;Hsu RT;Yang RJ;Wang YP;Wu H;Du X;Li A;Chien SC;Lee J;Yang S;Zhu J;Su CC;Chang Y;Huh CA
通讯作者：
Huh CA
1998-2014年长江口最大自由岛近期形态动力演化：人为干扰的影响
影响因子：
2.3
作者：
Wei Wen;Mei Xuefei;Dai Zhijun;Tang Zhenghong
通讯作者：
Tang Zhenghong
影响因子：
1.1
作者：
Y. Xiang
通讯作者：
Y. Xiang
影响因子：
2.8
作者：
T. Bianchi;John J. Galler;M. Allison
通讯作者：
T. Bianchi;John J. Galler;M. Allison
DOI：
--
发表时间：
2007
期刊：
Journal of Palaeogeography
影响因子：
--
作者：
Nc State
通讯作者：
Nc State