210Pb and 137Cs measurements in the Circum Bohai Sea coastal region: sedimentation rates and implications |
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| Authors: | Fu WANG Hong WANG Jianfen LI Yandong PEI Changfu FAN Lizhu TIAN Zhiwen SHANG Meiyu SONG Yan GENG |
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| Institution: | (1) Tianjin Institute of Geology and Mineral Resources, Tianjin, 300170, China;(2) Chinese Academy of Geological Sciences, Beijing, 100037, China;(3) China University of Geosciences, Beijing, 100083, China;(4) College of Earth Sciences, Jilin University, Changchun, 130026, China |
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| Abstract: | The representative 210Pb and 137Cs age-depth profiles were selected from more than 100 sites in the Circum Bohai Sea (CBS) coastal region to examine the sedimentation
rates and associated environmental changes. There are three unique 210Pbexc distribution patterns: 1) ideal-decaying type, representing relatively constant sediment supply and quieter environmental
setting; 2) wiggling type, but with approximately equivalent amplitude, representing coarser sediments and associated stronger
flow current environment; and 3) episodic-eventinfluencing type, each representing typhoon storm-influenced depositional environment.
Our results also show that there is a lower sedimentation rate (ca. 0.1 cm/a) in the coastal lowlands, a higher sedimentation
rate (ca. 0.5–3 cm/a) in the intertidal flat and an intermediate rate of ca. 0.58 cm/a in the subtidal zone near the Huanghua
Harbor. The interbedded silt layer occurring in the core sediment reveals lower 210Pb activities, indicating a discontinuous sedimentation mostly due to typhoon events which dwarfs against 210Pb and 137Cs applicability. Overall, the 210Pb and 137Cs measurements of the present study provide physical insight into the evaluation of the coastal-marine ecological environment
and associated management. |
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| Keywords: | 210Pb and 137Cs sedimentation rate Circum Bohai Sea (CBS) coastal region |
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