Nuclides distribution and sedimentary characteristics of the Diaokou course in Yellow River subaqueous delta
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摘要:
于黄河水下三角洲刁口叶瓣东侧获取柱状样K2，对其进行137Cs活度分析,发现活度剖面在2.7和1.9 m处分别存在一个最大蓄积峰和次级蓄积峰，根据137Cs的大气沉降规律并结合沉积物粒度数据与黄河输沙量,确定其最大蓄积峰对应于1964年，次级蓄积峰对应于1967年。柱状样的粒度组分以深度2.1 m为界可明显划分为两段，下段沉积物粒度组分稳定，上段砂粒含量明显增大并在1.9 m处达最大值。对柱状样210Pbex的活度剖面分析表明，其呈现两段式分布：1.9～3.5 m为衰变层，0～1.9 m为混合层。分析结果表明137Cs活度剖面的蓄积峰、沉积物粒度组分的改变以及210Pbex活度的两段式分布均记录了黄河入海口的变迁，并与黄河入海泥沙量存在对应关系。本文统计了研究区1958—2014年的历史水深资料，分析得出钻孔所处海域在1964—1976年（刁口流路行河期）的淤积厚度远大于1976—2014年（清水沟流路行河期）的侵蚀厚度，因此柱状样K2的137Cs活度剖面的1964年最大蓄积峰与210Pbex活度衰变层得以存在。
Abstract:The columnar sample K2 was obtained from the east side of the Diaokou course of the Yellow River subaqueous delta. By 137Cs activity measurement, it is found that there is a maximum accumulation peak at 2.7 m and a secondary accumulation peak at 1.9 m from the top respectively. After analyzing the atmospheric sedimentation rate of 137Cs, the grain size of sediments and the sediment load of the Yellow River, we infer that the maximum accumulation peak corresponds to the year of 1964, and the secondary accumulation peak to the year of 1967. According to the grain-size distribution, the K2 can be subdivided into two sections above and below the boundary of 2.1 m. the grain-size component of the lower section is rather stable, while the sand content in the upper section keeps increasing and reaches the maximum at 1.9 m. The 210Pbex activity profile exhibits a two-stage distribution pattern as well, 1.9m～3.5m is the decay layer, 0～1.9 m is the mixed layer. The accumulation peak of 137Cs activity profile, the change of sediment grain size components and the two-stage distribution of 210Pbex activity all record the mouth migration of the Yellow River. The sediment discharge of the Yellow River also plays an important role in the distribution of nuclides and sediment grain size. Based on the historical bathymetric data of the study area collected from 1958 to 2014, we could conclude that the deposited thickness of research area during the period from 1964 to 1976 (Diaokou River Passage) is much larger than the eroded thickness from 1976 to 2014 (Qingshuigou River Passage).
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Key words:
- 137Cs /
- grain-size /
- 210Pb /
- mouth migration /
- the Yellow River subaqueous delta
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图 3 研究区1959—2014年各期水深图 （水深依次为1959、1968、1976、1999、2007和2014年；遥感图依次为1984、1984、1984、1999、2007、2014年，黄河口遥感影像始于1984年）
Figure 3.
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[1] 常瑞芳, 崔青, 欧素英. 黄河口水下三角洲海底冲蚀沟发育的动力机制探讨[J]. 海洋学报, 1999, 21(3):90-97
CHANG Ruifang, CUI Qing, OU Suying. Study of dynamic mechanism for the formation and growth of gullylandform on the subaqueous delta near old Huanghe River mouth [J]. Acta Oceanologica Sinica, 1999, 21(3): 90-97.
[2] 仲德林, 刘建立. 黄河改道后河口至黄河海港海岸冲淤变化研究[J]. 海洋测绘, 2003, 23(1):49-52 doi: 10.3969/j.issn.1671-3044.2003.01.014
ZHONG Delin, LIU Jianli. Research on the scour-and-fill structure from the river mouth to the harbour bank of Yellow River after the diversion [J]. Hydrographic Surveying and Charting, 2003, 23(1): 49-52. doi: 10.3969/j.issn.1671-3044.2003.01.014
[3] 彭俊, 陈沈良. 近60年黄河水沙变化过程及其对三角洲的影响[J]. 地理学报, 2009, 64(11):1353-1362 doi: 10.3321/j.issn:0375-5444.2009.11.007
PENG Jun, CHEN Shenliang. The variation process of water and sediment and its effect on the yellow river delta over the six decades [J]. Acta Geographica Sinica, 2009, 64(11): 1353-1362. doi: 10.3321/j.issn:0375-5444.2009.11.007
[4] 彭俊, 陈沈良, 陈一强, 等. 黄河三角洲侵蚀性岸段水下岸坡地质灾害及其空间分布[J]. 海洋通报, 2014, 33(1):1-6 doi: 10.11840/j.issn.1001-6392.2014.01.001
PENG Jun, CHEN Shenliang, CHEN Yiqiang, et al. Geological hazards and their spatial distribution in the subaqueous slope at the erosive coast of the Yellow River delta [J]. Marine Science Bulletin, 2014, 33(1): 1-6. doi: 10.11840/j.issn.1001-6392.2014.01.001
[5] 张晓龙, 李培英. 现代黄河三角洲的海岸侵蚀及其环境影响[J]. 海洋环境科学, 2008, 27(5):475-479 doi: 10.3969/j.issn.1007-6336.2008.05.017
ZHANG Xiaolong, LI Peiying. Coastal erosion and its environmental effect in the Modern Yellow River Delta [J]. Marine Environmental Science, 2008, 27(5): 475-479. doi: 10.3969/j.issn.1007-6336.2008.05.017
[6] 刘淑平. 黄河三角洲冲淤时空变化特征及发展趋势预测[D]. 中国海洋大学硕士学位论文, 2007.
LIU Shuping. Study on spacial-tem poral evolution of erosion/deposition of Yellow River delta and trend forecast[D]. Master Dissertation of Ocean University of China, 2007.
[7] 李广雪, 薛春汀. 黄河水下三角洲沉积厚度、沉积速率及砂体形态[J]. 海洋地质与第四纪地质, 1993, 13(4):35-44
LI Guangxue, XUE Chunting. Sediment thickness, sedimentation rate and silt body shape of the Yellow River subaqueous delta lobe [J]. Marine Geology & Quaternary geology, 1993, 13(4): 35-44.
[8] 程天文, 赵楚年. 我国主要河流入海径流量、输沙量及对沿岸的影响[J]. 海洋学报, 1985, 7(4):460-471
CHENG Tianwen, ZHAO Chunian. Runoff, sediment transport and impact on coastal areas of major rivers in China [J]. Acta Oceanologica Sinica, 1985, 7(4): 460-471.
[9] Goldberg E D. Geochronology with 210Pb[C]//Radioactive Dating Proceedings of the Symposium on Radioactive Dating Held by the International Atomic Energy Agency in Co-operation with the Joint Commission on Applied Radioactivit. Athens: International Atomic Energy Agency, 1963: 121-131.
[10] Huh C A, Su C C. Sedimentation dynamics in the East China Sea elucidated from 210Pb, 137Cs and 239, 240Pu [J]. Marine Geology, 1999, 160(1): 183-196.
[11] 李凤业, 袁巍. 近代黄河三角洲海域210Pb多阶分布与河口变迁[J]. 海洋与湖沼, 1992, 23(5):566-570
LI Fengye, YUAN Wei. Stage distribution of 210Pb and implication of migration of the channel to the modern huanghe river delta [J]. Oceanologia et Limnologia Sinica, 1992, 23(5): 566-570.
[12] 成国栋, 业渝光, 刁少波. 黄河三角洲的210Pb剖面与再沉积作用[J]. 海洋地质与第四纪地质, 1995, 15(2):1-10
CHENG Guodong, YE Yuguang, DIAO Shaobo. 210Pb profile and redeposition of the Yellow river delta Cheng Guodong [J]. Marine Geology & Quaternary Geology, 1995, 15(2): 1-10.
[13] 李建芬, 王宏, 夏威岚, 等. 渤海湾西岸210Pbex、137Cs测年与现代沉积速率[J]. 地质调查与研究, 2003, 26(2):114-128 doi: 10.3969/j.issn.1672-4135.2003.02.009
LI Jianfen, WANG Hong, XIA Weilan, et al. 210Pb and 137Cs dating and modern sedimentation rate on the western coast of Bohai bay [J]. Geological Survey and Research, 2003, 26(2): 114-128. doi: 10.3969/j.issn.1672-4135.2003.02.009
[14] 任寒寒, 范德江, 张喜林, 等. 黄河入海口变迁的沉积记录: 来自粒度和210Pb的证据[J]. 海洋地质与第四纪地质, 2014, 34(4):21-29
REN Hanhan, FAN Dejiang, ZHANG Xilin, et al. Sedimentary records of the Yellow River mouth migration: evidence from grain-size and 210Pb [J]. Marine Geology & Quaternary Geology, 2014, 34(4): 21-29.
[15] Zhou L Y, Liu J, Saito Y, et al. Modern sediment characteristics and accumulation rates from the delta front to prodelta of the Yellow River (Huanghe) [J]. Geo-Marine Letters, 2016, 36(4): 247-258. doi: 10.1007/s00367-016-0442-x
[16] Bi N S, Yang Z S, Wang H J, et al. Sediment dispersion pattern off the present Huanghe (Yellow River) subdelta and its dynamic mechanism during normal river discharge period [J]. Estuarine, Coastal and Shelf Science, 2010, 86(3): 352-362. doi: 10.1016/j.ecss.2009.06.005
[17] Xing G P, Wang H J, Yang Z S, et al. Spatial and temporal variation in erosion and accumulation of the subaqueous Yellow River delta (1976-2004) [J]. Journal of Coastal Research, 2016, 74(sp1): 32-47.
[18] 王厚杰, 原晓军, 王燕, 等. 现代黄河三角洲废弃神仙沟-钓口叶瓣的演化及其动力机制[J]. 泥沙研究, 2010(4):51-60
WANG Houjie, YUAN Xiaojun, WANG Yan, et al. Evolution of the abandoned Shenxiangou-Diaokou delta lobe: processes and mechanism [J]. Journal of Sediment Research, 2010(4): 51-60.
[19] 王庆, 王小鲁, 李雪艳, 等. 黄河三角洲南部废弃三角洲潮间滩涂表层沉积粒度特征及其粗化现象[J]. 第四纪研究, 2017, 37(2):353-367 doi: 10.11928/j.issn.1001-7410.2017.02.13
WANG Qing, WANG Xiaolu, LI Xueyan. Grain size characteristics and coarsening phenomenon of inter-tidal flat surficial sediment along the abandoned southern Yellow River sub-delta [J]. Quaternary study, 2017, 37(2): 353-367. doi: 10.11928/j.issn.1001-7410.2017.02.13
[20] 李平, 朱大奎. 波浪在黄河三角洲形成中的作用[J]. 海洋地质与第四纪地质, 1997, 17(2):39-46
LI Ping, ZHU Dakui. The role of wave action on the formation of Yellow River delta [J]. Marine Geology & Quaternary Geology, 1997, 17(2): 39-46.
[21] 刘勇, 李广雪, 邓声贵, 等. 黄河废弃三角洲海底冲淤演变规律研究[J]. 海洋地质与第四纪地质, 2002, 22(3):27-34
LIU Yong, LI Guangxue, DENG Shenggui, et al. Evolution of erosion and accumulation in the abandoned subaqueous delta lobe of the Yellow River [J]. Marine Geology & Quaternary Geology, 2002, 22(3): 27-34.
[22] Hirose K, Igarashi Y, Aoyama M, et al. Long-term trends of plutonium fallout observed in Japan [J]. Radioactivity in the Environment, 2001, 1: 251-266. doi: 10.1016/S1569-4860(01)80018-8
[23] 万国江, 林文祝, 黄荣贵, 等. 红枫湖沉积物137Cs垂直剖面的计年特征及侵蚀示踪[J]. 科学通报, 1990, 35(19):1487-1490 doi: 10.1360/csb1990-35-19-1487
WAN Guojiang, LIN Wenzhu, HUANG Ronggui, et al. Sedimentation dating and erosion tracing of 137Cs for sediment in Hongfeng Lake [J]. Chinese Science Bulletin, 1990, 35(19): 1487-1490. doi: 10.1360/csb1990-35-19-1487
[24] 李春梅, 王红亚. 贵州省西南部麦岗水库沉积物的137Cs和210Pb测年与沉积速率研究[J]. 水土保持通报, 2010, 30(2):215-219
LI Chunmei, WANG Hongya. 137Cs and 210Pb dating and inference of sedimentation rate for maigang reservoir in southwest Guizhou province [J]. Bulletin of Soil and Water Conservation, 2010, 30(2): 215-219.
[25] Aoyama M, Hirose K, Miyao T, et al. 137Cs activity in surface water in the western North Pacific [J]. Journal of Radioanalytical and Nuclear Chemistry, 2001, 248(3): 789-793. doi: 10.1023/A:1010669501814
[26] 郝立波, 刘海洋, 陆继龙, 等. 松花湖沉积物137Cs和210Pb分布及沉积速率[J]. 吉林大学学报: 地球科学版, 2009(3):470-473
HAO Libo, LIU Haiyang, LU Jilong, et al. Distribution and deposition rate of 137Cs and 210Pb in songhua lake sediments [J]. Journal of Jilin University: Earth Science Edition, 2009(3): 470-473.
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