<sup>137</sup>Cs剖面的沉积信息提取——以香港贝澳湿地为例

潘少明

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¹³⁷Cs剖面的沉积信息提取——以香港贝澳湿地为例

潘少明

文章导航 > 沉积学报 > 2008 > 26(4): 655-661

潘少明. 137Cs剖面的沉积信息提取——以香港贝澳湿地为例[J]. 沉积学报, 2008, 26(4): 655-661.

引用本文:

潘少明. ¹³⁷Cs剖面的沉积信息提取——以香港贝澳湿地为例[J]. 沉积学报, 2008, 26(4): 655-661.

PAN Shao-ming. Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗[J]. Acta Sedimentologica Sinica, 2008, 26(4): 655-661.

Citation:

PAN Shao-ming. Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗[J]. Acta Sedimentologica Sinica, 2008, 26(4): 655-661.

潘少明. 137Cs剖面的沉积信息提取——以香港贝澳湿地为例[J]. 沉积学报, 2008, 26(4): 655-661.

引用本文:

潘少明. ¹³⁷Cs剖面的沉积信息提取——以香港贝澳湿地为例[J]. 沉积学报, 2008, 26(4): 655-661.

PAN Shao-ming. Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗[J]. Acta Sedimentologica Sinica, 2008, 26(4): 655-661.

Citation:

PAN Shao-ming. Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗[J]. Acta Sedimentologica Sinica, 2008, 26(4): 655-661.

¹³⁷Cs剖面的沉积信息提取——以香港贝澳湿地为例

潘少明

南京大学海岸与海岛开发教育部重点实验室南京 210093

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潘少明

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Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗

PAN Shao-ming

The Key Laborary of Coast and Island Exploitation of MOE, Nanjing University, Nanjing 210093

More Information

Corresponding author: PAN Shao-ming

摘要

摘要: 通过建立模型，对采自香港大屿山岛贝澳湿地三个站位的沉积样品的137Cs实测剖面与模型计算剖面的比较分析，得出三个站位的沉积速率分别为0.24 cm/a、0.21 cm/a、0.34 cm/a，除P1站位外，P2、P3站位由于受到潮水的作用，表层沉积物受到侵蚀，侵蚀量分别为4.8 cm和7 cm。该结果与常用的时标方法所的结果进行了比较，P1站位由上述模型所得的结果与常用的时标方法所得的结果一致。可以看出，在稳定的沉积环境下，常用的确定时标的方法可以较准确地计算出沉积速率，而在堆积与侵蚀变化的沉积环境下，常用的确定时标的方法就存在一定的缺陷。该工作为137Cs剖面的沉积信息提取进行了有益的尝试。但上述模型中,由于采用日本东京地区的137Cs大气沉降通量记录替代香港地区的137Cs大气沉降通量记录，并没有考虑 137Cs的扩散效应，所以该模型还有待进一步的改进。
- 137Cs /
- 香港贝澳湿地 /
- 模型 /
- 沉积速率
Abstract: Three sediment cores, 40～60 cm in depth, extracted at three locations in Pui O Salt marsh of Hong Kong were analyzed for 137Cs content at 1～2 cm intervals. Concentrations of〖KG1〗137Cs were measured γspectrometrically. The results of the 137Cs analyses shown that there were recognizable 137Cs peak and horizon in the 137Cs profiles in the sediment of the three stations. However, there was only one peak in the 137Cs distribution in the two stations, while two peaks were observed in the other station. The maximums of 137Cs activity in the three stations are 2.94 Bq/kg, 4.65 Bq/kg and 6.15 Bq/kg respectively. These values may be compared with that of sediments cores sampled from eastern zone of Hong Kong.Sediment accumulation rates are traditionally calculated by relating the first occurrence of 137Cs in the sediment sequence to the year 1954 and its maximum activity to 1963. But this method does not make full use of the information stored in the 137Cs distribution in the sediment column and sometimes it is difficult to get the right sedimentation rate in coastal area.To obtain more sedimentation process information, a model was fitted to the 137Cs vertical distribution. The difference between the measured and calculated profiles of 137Cs is distinct, accounting for the simplistic model, but the rationality of the model still exists and the difference can be explained. The sediment rates of the three sites were 0.24 cm/a, 0.21 cm/a, 0.34 cm/a according to the model, and some erosion may take place in the surface layer in recent year in P2 and P3 stations. The eroded sediments were about 4.8 and 7cm respectively. And in P1 station the sedimentation rate calculated using the model is coincidence with the result using its maximum activity to 1963. This study indicate that in the coastal area when the sedimentation environment is stead a reliable result can be got using 137Cs dating, and when the sedimentation environment was changed from sedimentation to erosion there is some limitations using 137Cs maximum activity to get the sedimentation rate. 
- 137Cs /
- Pui O Salt marsh /
- model /
- sedimentation rate

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[1]	高抒. 南京地区早三叠世碳酸盐沉积动力过程初探 . 沉积学报, 2023, 41(6): 1673-1680. doi: 10.14027/j.issn.1000-0550.2023.124
[2]	刘涛, 褚冠宇, 徐慧鹏. 基于风暴潮记录研究红树林淤积速率时间变化 . 沉积学报, 2022, 40(5): 1346-1354. doi: 10.14027/j.issn.1000-0550.2021.042
[3]	宗娴, 石学法, 葛晨东, 邹建军, Sergey Gorbarenko, 乔淑卿, 董智. 日本海百年来沉积速率及粒度指示意义 . 沉积学报, 2016, 34(3): 516-522. doi: 10.14027/j.cnki.cjxb.2016.03.009
[4]	夏鹏, 孟宪伟, 丰爱平, 李珍, 杨刚. 压实作用下广西典型红树林区沉积速率及海平面上升对红树林迁移效应的制衡 . 沉积学报, 2015, 33(3): 551-560. doi: 10.14027/j.cnki.cjxb.2015.03.013
[5]	闵凤阳. 深圳湾西北部海域表层沉积物的分布特征及输运趋势 . 沉积学报, 2009, 27(4): 714-722.
[6]	张瑞. 长江河口水下三角洲210Pb分布特征及其沉积速率 . 沉积学报, 2009, 27(4): 704-713.
[7]	薛春汀. 西汉末—北宋黄河三角洲（公元11～1099年）的沉积记录 . 沉积学报, 2008, 26(5): 804-812.
[8]	. 库车坳陷北部白垩系沉积速率分析 . 沉积学报, 2006, 24(05): 641-649.
[9]	张成君, 曹洁, 类延斌, 尚华明. 中国新疆博斯腾湖全新世沉积环境年代学特征 . 沉积学报, 2004, 22(3): 494-499.
[10]	章伟艳, 张富元, 陈荣华, 张霄宇. 南海深水区晚更新世以来沉积速率、沉积通量与物质组成 . 沉积学报, 2002, 20(4): 668-674.
[11]	吴智平, 周瑶琪. 一种计算沉积速率的新方法——宇宙尘埃特征元素法 . 沉积学报, 2000, 18(3): 395-399.
[12]	潘少明, 施晓冬, 王建业, PeterTanner, LaiShingLeong. 围海造地工程对香港维多利亚港现代沉积作用的影响 . 沉积学报, 2000, 18(1): 22-28.
[13]	刘晓东, 鹿化煜, 安芷生. 利用黄土沉积速率与粒度的相关性建立黄土序列年龄的新方法 . 沉积学报, 1999, 17(1): 145-148.
[14]	房德权, 宋岩, 曾凡刚, 王关玉. 天然气的扩散模型及扩散量的计算方法 . 沉积学报, 1998, 16(3): 72-74,79.
[15]	潘少明, 朱大奎, 李炎, 许其高. 河口港湾沉积物中的(¹³⁷)Cs剖面及其沉积学意义 . 沉积学报, 1997, 15(4): 67-71,66.
[16]	刘国臣, 金之钧, 李京昌. 沉积盆地沉积－剥蚀过程定量研究的一种新方法──盆地波动分析应用之一 . 沉积学报, 1995, 13(3): 23-31.
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[18]	杨松林, 刘国贤, 杜瑞芝, 张兵. 用²¹⁰Pb年代学方法对辽东湾现代沉积速率的研究 . 沉积学报, 1993, 11(1): 128-135.
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¹³⁷Cs剖面的沉积信息提取——以香港贝澳湿地为例

潘少明

南京大学海岸与海岛开发教育部重点实验室南京 210093

通讯作者: 潘少明

收稿日期: 1900-01-01
修回日期: 1900-01-01
刊出日期: 2008-08-10

关键词:

137Cs /

香港贝澳湿地 /

模型 /

沉积速率

摘要: 通过建立模型，对采自香港大屿山岛贝澳湿地三个站位的沉积样品的137Cs实测剖面与模型计算剖面的比较分析，得出三个站位的沉积速率分别为0.24 cm/a、0.21 cm/a、0.34 cm/a，除P1站位外，P2、P3站位由于受到潮水的作用，表层沉积物受到侵蚀，侵蚀量分别为4.8 cm和7 cm。该结果与常用的时标方法所的结果进行了比较，P1站位由上述模型所得的结果与常用的时标方法所得的结果一致。可以看出，在稳定的沉积环境下，常用的确定时标的方法可以较准确地计算出沉积速率，而在堆积与侵蚀变化的沉积环境下，常用的确定时标的方法就存在一定的缺陷。该工作为137Cs剖面的沉积信息提取进行了有益的尝试。但上述模型中,由于采用日本东京地区的137Cs大气沉降通量记录替代香港地区的137Cs大气沉降通量记录，并没有考虑 137Cs的扩散效应，所以该模型还有待进一步的改进。

English Abstract

Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗

PAN Shao-ming

The Key Laborary of Coast and Island Exploitation of MOE, Nanjing University, Nanjing 210093

Corresponding author: PAN Shao-ming

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2008-08-10

Keywords:

Abstract: Three sediment cores, 40～60 cm in depth, extracted at three locations in Pui O Salt marsh of Hong Kong were analyzed for 137Cs content at 1～2 cm intervals. Concentrations of〖KG1〗137Cs were measured γspectrometrically. The results of the 137Cs analyses shown that there were recognizable 137Cs peak and horizon in the 137Cs profiles in the sediment of the three stations. However, there was only one peak in the 137Cs distribution in the two stations, while two peaks were observed in the other station. The maximums of 137Cs activity in the three stations are 2.94 Bq/kg, 4.65 Bq/kg and 6.15 Bq/kg respectively. These values may be compared with that of sediments cores sampled from eastern zone of Hong Kong.Sediment accumulation rates are traditionally calculated by relating the first occurrence of 137Cs in the sediment sequence to the year 1954 and its maximum activity to 1963. But this method does not make full use of the information stored in the 137Cs distribution in the sediment column and sometimes it is difficult to get the right sedimentation rate in coastal area.To obtain more sedimentation process information, a model was fitted to the 137Cs vertical distribution. The difference between the measured and calculated profiles of 137Cs is distinct, accounting for the simplistic model, but the rationality of the model still exists and the difference can be explained. The sediment rates of the three sites were 0.24 cm/a, 0.21 cm/a, 0.34 cm/a according to the model, and some erosion may take place in the surface layer in recent year in P2 and P3 stations. The eroded sediments were about 4.8 and 7cm respectively. And in P1 station the sedimentation rate calculated using the model is coincidence with the result using its maximum activity to 1963. This study indicate that in the coastal area when the sedimentation environment is stead a reliable result can be got using 137Cs dating, and when the sedimentation environment was changed from sedimentation to erosion there is some limitations using 137Cs maximum activity to get the sedimentation rate. 

潘少明. 137Cs剖面的沉积信息提取——以香港贝澳湿地为例[J]. 沉积学报, 2008, 26(4): 655-661.

引用本文:

潘少明. ¹³⁷Cs剖面的沉积信息提取——以香港贝澳湿地为例[J]. 沉积学报, 2008, 26(4): 655-661.

PAN Shao-ming. Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗[J]. Acta Sedimentologica Sinica, 2008, 26(4): 655-661.

Citation:

PAN Shao-ming. Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗[J]. Acta Sedimentologica Sinica, 2008, 26(4): 655-661.

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¹³⁷Cs剖面的沉积信息提取——以香港贝澳湿地为例

通讯作者:
潘少明

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Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗

Corresponding author: PAN Shao-ming

计量

目录

¹³⁷Cs剖面的沉积信息提取——以香港贝澳湿地为例

南京大学海岸与海岛开发教育部重点实验室南京 210093

通讯作者: 潘少明

English Abstract

Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗

The Key Laborary of Coast and Island Exploitation of MOE, Nanjing University, Nanjing 210093

Corresponding author: PAN Shao-ming

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137Cs剖面的沉积信息提取——以香港贝澳湿地为例

通讯作者: 潘少明

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Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗

Corresponding author: PAN Shao-ming

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目录

137Cs剖面的沉积信息提取——以香港贝澳湿地为例

南京大学海岸与海岛开发教育部重点实验室 南京 210093

通讯作者: 潘少明

English Abstract

Sedimentation and Erosion in Pui O Salt Marsh of Hong Kong from 137Cs Distribution in Sediment〖HT5SS〗

The Key Laborary of Coast and Island Exploitation of MOE, Nanjing University, Nanjing 210093

Corresponding author: PAN Shao-ming

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¹³⁷Cs剖面的沉积信息提取——以香港贝澳湿地为例

通讯作者:
潘少明

¹³⁷Cs剖面的沉积信息提取——以香港贝澳湿地为例

南京大学海岸与海岛开发教育部重点实验室南京 210093