A Preliminary Analysis of Human Impacts on Sediment Discharges from the Yangtze, China, into the Sea

• Published in: Journal of coastal research Vol. 21; no. 3; pp. 515 - 521
• Main Authors: Xiqing, Chen, Erfeng, Zhang, Hongqiang, Mu, Zong, Y
• Format: Journal Article
• Language: English
• Published: Lawrence, KS Coastal Education and Research Foundation (CERF) 01.05.2005; Coastal Education and Research Foundation; Allen Press Inc
• Subjects: Anthropogenic factors; Brackish; Climate change; climate changes; Dams; Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Exact sciences and technology; Freshwater; Geomorphology, landform evolution; Human influences; Lakes; Marine; Marine and continental quaternary; Pollution, environment geology; RESEARCH PAPERS; Reservoirs; River basins; Riverbeds; Sand; sand mining; Sea water; Seas; Sediment discharge; sediment discharge into the sea; Sediment transport; Sediment yield; Sediments; Soil erosion; Surficial geology; Water resources; Yangtze River; West Pacific; Far East; East China Sea; China; Yangtze River; China, People's Rep., Hanjiang R; INW, China, People's Rep., Changjiang Estuary; China, People's Rep., Hubei Prov., Danjiangkou Reservoir; China, People's Rep., Changjiang R; impact statements; stream transport; climate changes; river discharge; reservoirs; sediment supply; climate; mining; sediment discharge into the sea; human activity; coastal environment; Yangtze River; sand; climate modification; modern; Asia; Pacific Ocean; soil erosion; sand mining; sediment volume; landform evolution
• ISSN: 0749-0208; 1551-5036
• DOI: 10.2112/03-0034.1

Sediment discharge from the Yangtze into the sea has decreased rapidly from 481.7 × 106 tons/y (1953–76) to 389.5 × 106 tons/y (1977–2000), without any corresponding decrease in water discharge. In 2001, the sediment discharge from the Yangtze dropped to 276 × 106 tons. Human activities and climate changes obviously play a major role for reducing the sediment supply from the upper basin and for increasing the sediment sinks in the mid–lower basin. Sediment budgets in different parts of the Yangtze are estimated according to hydrometric data and other sources. Major physical and anthropogenic processes are examined with respect to their effects on sediment discharge from the Yangtze into the sea. The decrease of sediment supply (−46.8 × 106 tons/y) from the upper Yangtze in the second period accounts for about 50% of the total decrease (−92.2 × 106 tons/y) into the sea, mostly due to the increased sedimentation in reservoirs as well as climatic factors. The other 50% decrease is mostly attributed to increased sand mining in the mid–lower Yangtze and the decreased sediment supply from the Hanjiang River after building the Danjiangkou Reservoir.