Spatiotemporal variation characteristics and sedimentation rate of sediment grain size in Fangchenggang Sea of Guangxi
PANG Guotao1, YANG Yuanzhen1, ZHANG Xiaolei1,2, XIE Lei1, YAN Xingguo1, HU Yanbin1,3, ZENG Jiao1
1. Yantai Geological Survey Center of Coastal Zone, China Geological Survey, Shandong Yantai 264000, China; 2. College of Marine Earth Sciences, Ocean University of China, Shandong Qingdao 266100, China; 3. College of Earth Science and Engineering, Shandong University of Science and Technology, Shandong Qingdao 266590, China
Abstract Sediment particle size characteristics are important parameters reflecting sedimentary environment. In order to understand the sedimentary evolution law of Fangchenggang Sea area, the authors carried out grain size analysis and 210Pb isotope dating on five core sediments in the vertical coastline direction of Fangchenggang coastal waters, and obtained the grain size parameter change characteristics, sediment types and sedimentation rates of the five core sediments respectively. The Fangchenggang landform and human activities, the material source, sedimentation dynamics and sedimentation rate influencing factors were also considered. The results show that the variation range of grain size parameters of FC13Z, FC16Z and FC12Z above 60 cm is relatively small, indicating a relatively stable sedimentary environment. While, the variation range of grain size parameters of FC14Z, FC15Z and FC12Z below 60 cm is relatively large, indicating a relatively fluctuating sedimentary environment. The sediment sorting is relatively poor to poor, and the skewness is nearly symmetrical positive, with a very flat peak. The core sediments in the study area can be divided into seven types: sandy silt, silty sand, sandy mud, argillaceous sand, pebbly argillaceous sand, pebbly mud and mud. The sediment from the nearshore to the front edge gradually converts from sand dominated to mud dominated, and the sedimentation rate shows a significant weakening trend. The sediment source is mainly from river input and coastal erosion, and the sedimentary power mainly comes from tidal current and nearshore current system. The sedimentation rate is greatly affected by the tidal current. The results of this study would provide some references for the sedimentary environment and geomorphological evolution study in the coastal waters of Fangchenggang Sea.
PANG Guotao,YANG Yuanzhen,ZHANG Xiaolei, et al. Spatiotemporal variation characteristics and sedimentation rate of sediment grain size in Fangchenggang Sea of Guangxi[J]. , 2023, 10(4): 89-97.
[1] Duck R W,Rowan J S,Jenkins P A,et al.A multi-method study of bedload provenance and transport pathways in an estuarine channel[J].Physics and Chemistry of the Earth,Part B: Hydrology,Oceans and Atmosphere,2001,26(9):747-752. [2] 徐志伟,汪亚平,李炎,等.多元统计及物源分析支持的北部湾东部海域沉积物输运趋势[J].海洋学报,2010,32(3):67-78. Xu Z W,Wang Y P,Li Y,et al.Sediment transport patterns in the eastern Beibu Gulf based on grain-size multivariate statistics and provenance analysis[J].Acta Oceanologica Sinica,2010,32(3):67-78. [3] Yuan P,Wang H J,Wu X,et al.Grain-size distribution of surface sediments in the Bohai Sea and the Northern Yellow Sea:sediment supply and hydrodynamics[J].Journal of Ocean University of China,2020,19(3):589-600. [4] Pennington W,Tutin T G,Cambray R S,et al.Observations on lake sediments using fallout 137Cs as a tracer[J].Nature,1973,242(5396):342-346. [5] Delaune R D,Patrick W H,Buresh R J,et al.Sedimentation rates determined by 137Cs dating in a rapidly accreting salt marsh[J].Nature,1978,275(5680):532-533. [6] Karbassi A R,Amirnezhad R.Geochemistry of heavy metals and sedimentation rate in a bay adjacent to the Caspian Sea[J].International Journal of Environmental Science & Technology,2004,1(3):191-198. [7] Benoit G,Rozan T F.210Pb and 137Cs dating methods in lakes:A retrospective study[J].Journal of Paleolimnology,2001,25(4):455-465. [8] Dai J C,Song J M,Li X G,et al.Environmental changes reflected by sedimentary geochemistry in recent hundred years of Jiaozhou Bay,North China[J].Environmental Pollution,2007,145(3):656-667. [9] Kato Y,Nakatsuka T,Masuzawa T,et al.Behavior of setting particles and sedimentation rate inferred from 210Pb and 137Cs distributions in Sagami Bay,Japan[J].Bulletin of the Society of Sea Water Science Japan,2003,57(3):150-165. [10] Oguri K,Harada N,Tadai O.Excess 210Pb and 137Cs concentrations,mass accumulation rates,and sedimentary processes on the Bering Sea continental shelf[J].Deep Sea Research Part II:Topical Studies in Oceanography,2012,61-64:193-204. [11] 黎广钊,农华琼,刘敬合.防城湾自然环境与沉积物组成分析[J].广西科学院学报,1997,13(4):1-8. Li G Z,Nong H Q,Liu J H.Analysis of the natural environment and surface sedimental composition from Fangcheng Bay[J].Journal of Guangxi Academy of Sciences,1997,13(4):1-8. [12] 张亮,梁开,甘华阳,等.广西防城港海域沉积物特征及输运趋势[J].热带地理,2014,34(5):690-695. Zhang L,Liang K,Gan H Y,et al.Sediment characteristics and transport trends in the Sea Area of Fangcheng Port,Guangxi[J].Tropical Geography,2014,34(5):690-695. [13] 许冬,初凤友,杨海丽,等.北部湾现代沉积速率[J].海洋地质与第四纪地质,2012,32(6):17-26. Xu D,Chu F Y,Yang H L,et al.Modern sedimentation rates in the Beibu Gulf[J].Marine Geology & Quaternary Geology,2012,32(6):17-26. [14] 陈刚,李从先.广西防城港冰后期沉积层序和沉积作用[J].海洋学报,1988,10(2):198-203. Chen G,Li C X.Postglacial sedimentary sequence and sedimentation in Fangchenggang,Guangxi[J].Acta Oceanologica Sinica,1988,10(2):198-203. [15] 中国海湾志编纂委员会.中国海湾志-第十二分册-广西海湾[M].北京:海洋出版社,1993. Editiorial Committee of Chinese Gulf.Chinese Gulf:vol.12:Guang-xi Gulf[M].Beijing:Ocean Press,1993. [16] Folk R L,Ward W C.Brazos river bar;a study in the significance of grain size parameters[J].Journal of Sedimentary Research,1957,27(1):3-26. [17] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T11743—2013 土壤中放射性核素的γ能谱分析方法[S].北京:中国标准出版社,2014. General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China,Standardization Administration of the People's Republic of China.GB/T11743—2013 Determination of radionuclides in soil by gamma spectrometry[S].Beijing:Standards Press of China,2014. [18] Appleby P G,Nolan P J,Gifford D W,et al.210Pb dating by low background gamma counting[J].Hydrobiologia,1986,143(1):21-27. [19] Folk R L,Andrews P B,Lewis D W.Detrital sedimentary rock classification and nomenclature for use in New Zealand[J].New Zealand Journal of Geology and Geophysics,1970,13(4):937-968. [20] 许冬. 北部湾东部末次冰消期以来的沉积记录及现代沉积格局的形成[D].青岛:中国科学院大学,2014. Xu D.Sedimentary Records Since Last Deglaciation and the Formation of Modern Sedimentary Pattern in Eastern Beibu Gulf[D].Qingdao:The University of Chinese Academy of Sciences,2014. [21] 张爱梅,陈敏,甘华阳,等.北部湾SO-50柱状沉积物地球化学特征及其物源分析[J].海洋学报,2018,40(5):107-117. Zhang A M,Chen M,Gan H Y,et al.Geochemical characteristics and sediment provenance of Core SO-50 sediments in the Beibu Gulf[J].Acta Oceanologica Sinica,2018,40(5):107-117. [22] 马胜中,梁开,陈太浩.广西钦州湾浅层埋藏古河道沉积特征[C]//第十四届中国海洋(岸)工程学术讨论会论文集(下册).呼和浩特:海洋出版社,2009:1225-1229. Ma S Z,Liang K,Chen T H.Sedimentary characteristics of shallow buried Paleohe channels in Qinzhou Bay,Guangxi[C]//Proceedings of the 14th Symposium on Oceanographic (Shore) Engineering in China:Part 2.Hohhot:China Ocean Press,2009:1225-1229. [23] 刘涛,黎广钊.北部湾广西沿岸全新世海侵过程的区域差异[J].海洋学报,2015,37(3):70-76. Liu T,Li G Z.The spatial discrepancy of Holocene transgression in north Beibu Gulf of Guangxi coastline[J].Acta Oceanologica Sinica,2015,37(3):70-76. [24] 海军海道测量局.航海图书目录[M].北京:中国航海图书出版社,2018. Naval Hydrographic Survey Bureau.Catalog of Charts and Publications[M].Beijing:China Navigation Publications Press,2018. [25] 周相君,李晓敏,马毅,等.基于遥感的广西防城湾海岸线变迁分析[J].海洋学研究,2014,32(1):47-55. Zhou X J,Li X M,Ma Y,et al.Analysis of shoreline changes in the Fangcheng Bay of Guangxi based on remote sensing technique[J].Journal of Marine Sciences,2014,32(1):47-55. [26] 陈波,侍茂崇,邱绍芳.广西主要港湾余流特征及其对物质输运的影响[J].海洋湖沼通报,2003(1):13-21. Chen B,Shi M C,Qiu S F.Characteristics of residual currents and their influence on the material transportation in five main bays of Guangxi coast[J].Transaction of Oceanology and Limnology,2003(1):13-21. [27] 刘鑫,马胜中,陈太浩.广西防城港近岸海域主要灾害地质因素的分布及特征[J].地质学刊,2015,39(4):641-646. Liu X,Ma S Z,Chen T H.Distribution and features of the hazardous geological factors in offshore areas of Fangchenggang City in Guangxi[J].Journal of Geology,2015,39(4):641-646. [28] 陈波,陈宪云,牙韩争,等.防城港湾及其邻近海域潮流和余流特征研究[J].海洋湖沼通报,2020(3):16-23. Chen B,Chen X Y,Ya H Z,et al.Research on the characteristics of tidal and residual current in the Fangchenggang Bay and its adjacent waters[J].Transactions of Oceanology and Limnology,2020(3):16-23. [29] 范德江,杨作升,郭志刚.中国陆架210Pb测年应用现状与思考[J].地球科学进展,2000,15(3):297-302. Fan D J,Yang Z S,Guo Z G.Review of 210Pb dating in the continental shelf of China[J].Advance in Earth Sciences,2000,15(3):297-302.
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