GRAIN SIZE TRENDS AND NET TRANSPORT PATTERNS OF SURFACE SEDIMENTS IN THE EAST CHINA SEA INNER CONTINENTAL SHELF
-
摘要: 根据对东海内陆架海底沉积物的粒度测试,运用Gao-Collins"粒度趋势分析"方法,探讨了东海内陆架海底表层沉积物的粒度分布特征和净输运趋势。结果表明,研究区表层沉积物可以分为两类:细颗粒(>5Φ)和粗颗粒(<5Φ);细颗粒分布于研究区的大部分区域,而粗颗粒主要分布在闽江、瓯江等入海河流口门以及马祖等海岛附近;表层沉积物的平均粒径、分选系数、偏态等粒度参数对应性较好,总体特征为粒径越粗,分选越差,偏态更正偏,而粒径越细,分选越好,偏态也较低;粒径趋势分析显示东海陆架表层沉积物的运移模式总体为NE-WS方向运移,而研究区边缘在运移过程中发生向左右两侧的偏移,南部闽江河口区沉积物由近岸向海方向辐射运移,研究区表层沉积物的净输运模式主要受控于流系和地形等多种因素。Abstract: Based on the grain-size analysis of surface sediments collected from the East China Sea inner shelf, Geo-Collins grain size trend analysis was carried out to delineate net sediment transport patterns of the study area. The results indicate that surface sediments from the study area can be divided into two categories:fine particles (<5 Φ particle) and coarse particles (>5 Φ particle). Grain size parameters have distinct patterns in spatial distributions in the East China Sea inner shelf.Sediments with fine grain size, well-sorted and low skewed, are distributed in most of the study area, whereas sediments with coarse grain size, poorly sorted and highly positively skewed, are distributed in some estuary and island areas, such as the Minjiang River mouth, the Oujiang River mouth and the Mazu Island. Surface sediments are mostly transported from northeast towards southwest, while the boundary of the area has given rise to offset to both left and right sides. Sediments near the Minjiang River mouth radiate towards the sea. The net transport patterns of surface sediments in the study area are controlled by many factors, especially the currents and morphology.
-
-
[1] Gao S, Collins M.The use of grain size trends in marine sediment dynamics:a review[J]. Chinese Journal of Oceanology and Limnology,2001,19(3):265-271.
[2] Gao S, Collins M.Analysis of grain size trends, for defining sediment transport pathways in marine environments[J]. Journal of Coastal Research, 1994a, 10(1):70-78.
[3] Gao S, Collins M, Lanckneus J, et al.Grain size trends associated with net sediment transport patterns:an example from the Belgian continental shelf[J]. Marine Geology, 1994b,171-185.
[4] Pedreros R, Howa H L, Michel D. Application of grain size trend analysis for the determination of sediment transport pathways in intertidal areas[J]. Marine Geology, 1996, 135:35-49.
[5] 程鹏,高抒.北黄海西部海底沉积物的粒度特征和净输运趋势[J].海洋与湖沼,2000,31(6):604-615. [CHENG Peng,GAO Shu.Net sediment transport patterns over the northwestern Yellow Sea, based upon grain size trend analysis[J]. Oceanologia et Limnologia Sinica,2000,31(6):604-615.]
[6] 王国庆,石学法,刘焱光,等.粒径趋势分析对长江南支口外沉积物输运的指示意义[J].海洋学报,2007,29(6):161-166. [WANG Guoqing,SHI Xuefa,LIU Yanguang, et al.Grain-size trend analysis on the south branch of the Changjiang estuary in China and its implication to sediment transportation[J]. Acta Oceanologica Sinica, 2007,29(6):161-166]
[7] McManus J.Grain Size Determination and Interpretation[M].Tucker Med.Techniques in Sedimentology, Black-well, Oxford, 1988:63-85.
[8] 汪亚平,高抒,贾建军.胶州湾及临近海域沉积物分布特征和运移趋势[J].地理学报,2000,55(4):449-458. [WANG Yaping,Gao Shu,JIA Jianjun.Sediment distribution and transport patterns in Jiaozhou Bay and adjoining areas[J]. Acta Geographica Sinica,2000,55(4):449-458.]
[9] 石学法,陈春峰,刘焱光,等.南黄海中部沉积物粒径趋势分析及搬运作用[J].科学通报,2002,47(6):452-456. [SHI Xuefa,CHEN Chunfeng,LIU Yanguang, et al.Trend analysis of sediment grain size and sedimentary process in the central south Yellow Sea[J].Chinese Science Bulletin,2002,47(6):452-456.]
[10] 朱耀华,方国洪.陆架和浅海环流的一个三维正压模式及其在渤、黄、东海的应用[J].海洋学报,1994,16(6):11-26. [ZHU Yaohua,FANG Guohong.A three-dimension overbalance pressure model of continental shelf and offshore circuit and its application in the Bohai,Yellow Sea and East China Sea[J].Acta Oceanologica Sinica,1994,16(6):11-26.]
[11] 张怀静,翟世奎,范德江,等.三峡工程一期蓄水后长江口及其临近海域悬浮物浓度分布特征[J].环境科学,2007,28(8):1655-1661. [ZHANG Huaijing,ZHAI Shikui,FAN Dejiang, et al.Distribution of suspended matter concentration in the Changjiang estuary and adjacent area after the first-stage storage of the three gorges project[J]. Environmental Science,2007,28(8):1655-1661.]
[12] 鲍献文,林霄沛,吴德星,等.东海陆架环流季节变化的模拟与分析[J].中国海洋大学学报,2005,35(3):349-356. [BAO Xianwen,LIN Xiaopei,WU Dexing, et al. Simulation and analysis of shelf circulation and its seasonal variability in the East China Sea[J]. Periodical of Ocean University of China,2005,35(3):349-356.]
[13] 龙海燕,庄振业,刘升发,等.扬子浅滩沙波底形活动性评估[J].海洋地质与第四纪地质,2007,27(6):17-24. [LONG Haiyan,ZHUANG Zhenye,LIU Shengfa, et al. Activity magnitude of the small-medium subaqueous dunes in the Yangtze shoal[J]. Marine Geology and Quaternary Geology,2007,27(6):17-24.]
[14] Liu J P, Li A C, Xu K H, et al.Sedimentary features of the Yangtze River-derived along-shelf clinoform deposit in the East China Sea[J]. Continental Shelf Research, 2006, 26:2141-2156.
[15] 金元欢.我国入海河口的基本特点[J].东海海洋,1988,6(3):1-11. [JIN Yuanhuan. The characteristics of estuarine in China[J]. Donghai Marine Science,1988,6(3):1-11.]
计量
- 文章访问数: 2129
- HTML全文浏览量: 222
- PDF下载量: 31
下载:
