Anthropogenic influence on sedimentation during the last 100?years inferred from magnetic properties in the Changjiang Estuary, China

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• 作者：Yonghong Wang ; Takashi Oguchi ; Peter V. Ridd ; Huanting Shen
• 关键词：Sediments ; The Changjiang Estuary ; Human activities ; Magnetic properties
• 刊名：Environmental Earth Sciences
• 出版年：2013
• 出版时间：October 2013
• 年：2013
• 卷：70
• 期：4
• 页码：1671-1680
• 全文大小：1002KB
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• 作者单位：Yonghong Wang (1) (2)
  Takashi Oguchi (3)
  Peter V. Ridd (4)
  Huanting Shen (5)
  
  1. Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Ocean University of China, 238 Songling Road, Qingdao, 266100, China
  2. Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao, 266071, China
  3. Center for Spatial Information Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8568, Japan
  4. Marine Geophysical Laboratory, School of Engineering and Physical Sciences, James Cook University, Townsville, QLD, 4811, Australia
  5. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 Zhongshan Road (N), Shanghai, 200062, China
  
• ISSN：1866-6299

文摘

A 100-year sedimentary record in the Changjiang Estuary was examined to elucidate natural and anthropogenic influences on the morphodynamic evolution of the estuary. Two gravity cores were acquired and their magnetic properties, sediment size, chemical elements and 210Pb geochronology were analyzed to infer the sedimentation. The results indicate that these sedimentological indexes, especially magnetic properties and trace elements, changed significantly during the last 100?years, with an abrupt change occurring at around 1960. This abrupt change is likely the result of a reduction in hydrodynamic energy caused by the narrowing of an upstream estuary reach due to reclamation. An increase of terrigenous input, due to soil erosion in the upper and middle reaches of the Changjiang, and increases in steel production may have also had a significant influence, as indicated by studies of other locations in the Changjiang drainage basin.