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High resolution records of flood deposition in the mud area off the Changjiang River mouth during the past century
Hu Gang1,2,3; Li Anchun1; Liu Jian2; Xu Gang2; Mei Xi2; Kong Xianghuai2; Li, AC (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China.
2014-07-01
发表期刊CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
卷号32期号:4页码:909-920
文章类型Article
摘要This paper presents a paleoflood study to determine the flood frequency of the Changjiang River, based on core cj0702, taken from the Changjiang River subaqueous delta. We identified flood deposits by means of high-resolution grain-size variation, sensitive population, geochemical indexes and magnetic susceptibility. The core covers a time span of 120 years by Pb-210 dating and was sampled at 1-2 cm intervals. Grain size, geochemical elements, and physical parameters were analyzed. The results indicate that the sediment of the core is mainly composed of silt and clay, as well as groups of interbedded silt, clay silt, and clay. Vertically, the grain size pattern was controlled by seasonal variations in water discharge and by the sediment input in winter from the abandoned Huanghe River delta. River flooding caused extreme values in all our measured parameters. We identified more than 20 flood events that occurred since 1887 using the physical parameter analysis method. The environmentally sensitive component of sediment grain size (14.32-96.39 m) contribution>30%, Zr/Rb ratio>1.5, and magnetic susceptibility>16 were selected as the criteria for flood identification generally. We also found that floods that had taken place in the upstream, midstream, or downstream parts of the river were clearly identified by these indexes while the large-scale floods that covered the whole drainage area did not leave clear indications in the sediment record. This study for identification of flood events is of great significance for understanding hyperpycnal current sedimentation as well as for forecasting of floods.
关键词High Resolution Grain Size Flood Deposition Mud Area The Changjiang River
学科领域Marine & Freshwater Biology ; Oceanography
DOI10.1007/s00343-014-3244-x
收录类别SCI
语种英语
WOS记录号WOS:000339046200018
引用统计
被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/23819
专题海洋地质与环境重点实验室
通讯作者Li, AC (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China.
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Minist Land & Resources, Key Lab Marine Hydrocarbon Resources & Environm G, Qingdao 266071, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位中国科学院海洋研究所
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GB/T 7714
Hu Gang,Li Anchun,Liu Jian,et al. High resolution records of flood deposition in the mud area off the Changjiang River mouth during the past century[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2014,32(4):909-920.
APA Hu Gang.,Li Anchun.,Liu Jian.,Xu Gang.,Mei Xi.,...&Li, AC .(2014).High resolution records of flood deposition in the mud area off the Changjiang River mouth during the past century.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,32(4),909-920.
MLA Hu Gang,et al."High resolution records of flood deposition in the mud area off the Changjiang River mouth during the past century".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 32.4(2014):909-920.
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