High resolution records of flood deposition in the mud area off the Changjiang River mouth during the past century
文献类型：CNKI期刊论文
| 作者 | Hu G(胡刚); Li AC(李安春); Liu J(刘健); Xu G(徐刚); Mei X(梅西); Kong XH(孔祥淮) |
| 发表日期 | 2014-07-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | high resolution grain size flood deposition mud area the Changjiang River |
| 英文摘要 | 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 210 Pb 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 μm) 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. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National Natural Science Foundation of China(Nos.41206073,41376079,41206051,41206052) ; the China Geological Survey(Nos.1212010611401,200900501) |
| 卷 | v.32期:04页:175-186 |
| 语种 | 英文; |
| 分类号 | P736.21 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/190392]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.KeyLabofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 2.KeyLabofMarineHydrocarbonResourcesandEnvironmentalGeology,MinistryofLandandResources 3.UniversityofChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Hu G,Li AC,Liu J,et al. High resolution records of flood deposition in the mud area off the Changjiang River mouth during the past century. 2014. |
入库方式： OAI收割
来源：海洋研究所
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