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篇目详细内容 |
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【篇名】 |
210Pb and 137Cs measurements in the Circum Bohai Sea coastal region: sedimentation rates and implications |
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【刊名】 |
Frontiers of Earth Science in China |
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【刊名缩写】 |
Front. Earth Sci. China |
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【ISSN】 |
1673-7385 |
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【EISSN】 |
1673-7490 |
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【DOI】 |
10.1007/s11707-008-0046-5 |
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【出版社】 |
Higher Education Press and Springer-Verlag |
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【出版年】 |
2008 |
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【卷期】 |
2
卷3期 |
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【页码】 |
276-282
页,共
7
页 |
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【作者】 |
WANG Fu;
WANG Hong;
LI Jianfen;
PEI Yandong;
FAN Changfu;
TIAN Lizhu;
SHANG Zhiwen;
SONG Meiyu;
GENG Yan;
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【关键词】 |
210Pb and 137Cs, sedimentation rate, Circum Bohai Sea (CBS) coastal region |
【摘要】 |
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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-event-influencing 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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