Recent Sedimentation Dynamics Indicated by super( 210)Pb sub( exc) and super( 137)Cs Records from the Subtidal Area of Bohai Bay, China

To determine sedimentation rate changes across an open marine area along the west coast of Bohai Bay, more than 50 short sediment cores were collected and analyzed with their sedimentation rates estimated by excess super( 210)Pb ( super( 210)Pb sub( exc)) and super( 137)Cs in the sediment. The surve...

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Bibliographic Details
Published in:Journal of coastal research 2016-03, Vol.32 (2), p.416-416
Main Authors: Wang, Fu, Zong, Yong Qiang, Li, Jian Fen, Tian, Li Zhu, Shang, Zhi Wen, Chen, Yong Sheng, Jiang, Xing Yu, Yang, Ji Long, Yang, Biao, Wang, Hong
Format: Article
Language:English
Subjects:
Boundaries
Brackish
Constants
Deposition
Marine environments
Markers
Rivers
Sedimentation
Sediments
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Summary:To determine sedimentation rate changes across an open marine area along the west coast of Bohai Bay, more than 50 short sediment cores were collected and analyzed with their sedimentation rates estimated by excess super( 210)Pb ( super( 210)Pb sub( exc)) and super( 137)Cs in the sediment. The surveys enabled the authors to explore the relationship between sediment supply changes from the rivers and the spatial/temporal deposition patterns in the shallow marine areas. Several core records show that sedimentation rates can be overestimated by the conventional constant initial concentration model based on the super( 210)Pb sub( exc) curves alone. The overestimation was caused by a change of super( 210)Pb sub( exc) in the top layers of these cores and this is confirmed by comparing super( 210)Pb sub( exc) curves with the respective super( 137)Cs curves. The sedimentary boundary where sedimentation rate changed is largely comparable with the timing of sediment supply change according to the river discharge data, which can be used as a local time marker for sedimentation rate comparison.
ISSN:0749-0208
DOI:10.2112/JCOASTRES-D-15-00074.1