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

Wang, Yonghong, Oguchi, Takashi, Ridd, Peter V., and Shen, Huanting (2013) Anthropogenic influence on sedimentation during the last 100 years inferred from magnetic properties in the Changjiang Estuary, China. Environmental Earth Sciences, 70 (4). pp. 1671-1680.

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Abstract

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 ²¹°Pb 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.

Item ID: 30084
Item Type: Article (Refereed Research - C1)
Keywords: sediments; Changjiang Estuary; human activities; magnetic properties
ISSN: 1866-6299
Funders: National Natural Science Foundation of China, National Key Natural Science Foundation of China, National Natural Science Foundation of Shandong Province, Key Laboratory of Marine and Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources
Projects and Grants: National Natural Science Foundation of China grant 41030856, National Key Natural Science Foundation of China grant 41176039, National Natural Science Foundation of Shandong Province grant ZR201DZ001, Ministry of Land and Resources grant MRE200903
Date Deposited: 05 Nov 2013 04:19
FoR Codes: 04 EARTH SCIENCES > 0405 Oceanography > 040503 Physical Oceanography @ 100%
SEO Codes: 96 ENVIRONMENT > 9611 Physical and Chemical Conditions of Water > 961102 Physical and Chemical Conditions of Water in Coastal and Estuarine Environments @ 100%
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