扬子浅滩沙波底形活动性评估

龙海燕; 庄振业; 刘升发; 吕海青; 叶银灿; 杜文博

扬子浅滩沙波底形活动性评估

1 中国海洋大学海洋地球科学学院, 青岛 266100;
2 中国科学院海洋研究所, 青岛 266007;
3 国家海洋局第二海洋研究所, 杭州 310012

基金项目:

国家自然科学基金项目(40476032)

详细信息

作者简介:
龙海燕(1979-),女,博士生,海洋地质专业,E-mail:hylong@ouc.edu.cn

中图分类号: P736.21
计量
- 文章访问数: 1667
- HTML全文浏览量: 167
- PDF下载量: 13
出版历程
- 收稿日期: 2007-05-29
- 修回日期: 2007-08-14

ACTIVITY MAGNITUDE OF THE SMALL-MEDIUM SUBAQUEOUS DUNES IN THE YANGTZE SHOAL

1 Ocean University of China, Qingdao 266100, China;
2 Institute of Oceanology, Chinses Academy of Sciences, Qingdao 266071, China;
3 Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 扬子浅滩位于长江口以东,水深40 m左右,普遍发育中小水下沙丘并处于运动状态。按32片沙波参数统计,迁移方向在90°~180°之间,其中150°~180°者占30%,120°~150°者占69%;使用Rubin和改进的Hardisty公式计算,以潮流作用为主的常态海况下,沙波迁移率为19.70 m/a,以浪流为主的暴风浪期间,约为12.72 m/a,一年总迁移率约为32.4 m/a,与世界上若干海底沙波定位观测数据相对比,这一迁移率应属于缓慢-中等的量级。
- 沙波 /
- 迁移方向 /
- 迁移率 /
- 扬子浅滩
Abstract: The Yangtze shoal, located in the east of the Yangtze River Estuary and about 40 m deep below sea level,has widely spread small-medium subaqueous dunes,whose wave height is 0.6 m and which are generally in activity. Statistical result of 32 subaqueous dune areas shows that the movement direction is within 90°~180°.150°~180° direction accounts for 30% and 120°~150° for 69%. The movement velocity of the small-medium subaqueous dunes, calculated using the formulas from Rubin and Hardisty, is usually 19.70 m/a and controlled by tidal currents, and is 12.7 m/a in storm season.And the total migration rate is 32.4 m/a. Compared with observation data from other small-medium subaqueous dunes in the world, the activity of small-medium subaqueous dunes in the Yangtze shoal belongs to a slow-medium magnitude.
- the small-medium subaqueous dunes /
- transport direction /
- transport velocity /
- the Yangtze shoal

HTML全文

参考文献(20)

[1]	刘振夏.对东海扬子浅滩成因的再认识[J].海洋学报,1996,18(2):85-92. [LIU Zhen-xia.Understanding Again the Origin of the Yangtze Shoal in the East China Sea[J].Acta Oceanologica,1992,18(2):85-92.]
[2]	金翔龙.东海海洋地质[M].北京:海洋出版社,1992.[JIN Xiang-long.East China Sea Marine Geology[M].Beijing:China Ocean Press,1992.]
[3]	陈中原.长江口外现代水下地貌与沉积[J].东海海洋,1986,4(2):29-37. [CHEN Zhong-yuan.Modern subaqueous morphlogy and sedimentation off the Yangtze River estuary[J].Donghai Marine Science,1986,4(2):29-37.]
[4]	刘锡清.中国陆架残留沉积[J].海洋地质与第四纪地质,1987,7(1):1-14. [LIU Xi-qing.Relict sediments in China continental shelves[J].Marine Geology and Quaternary Geology,1987,7(1):1-14.]
[5]	李广雪.中国东部海域海底沉积物成因环境图[M].北京:科学出版社,2005.[LI Guang-xue.Genetic Environments of Seafloor Sediments in China Eastern Sea Areas[M].Beijing:Science Press,2005.]
[6]	李全兴.渤海黄海东海地质地球物理图集[M]. 北京:海洋出版社,1990.[LI Quan-xing.Atlas of Geology and Geophysics of the Bohai Sea,Yellow Sea and East China Sea[M].Beijing:China Ocean Press,1990.]
[7]	叶银灿.东海扬子浅滩砂质底形研究[J].中国海洋大学学报,2004,34(6):1057-1062. [YE Yin-can.A study of sandy bedforms on the Yangtze shoal in the East China Sea[J].Periodical of Ocean University of China,2004,34(6):1057-1062.]
[8]	Sternberg R W,Larsen L H,Miaot Y T.Tidally driven sediment transport on the East China Sea continental shelf[J].Continental Shelf Research, 1985,4:105-120.
[9]	Ashley G M.Classification of large-scale subaqueous bedform:New look at an old problem[J]J.Sedimentary Peter,1990,60(1):160-172.
[10]	Rubin D M,Hunter R E.Bedform climbing in theory and nature[J].Sedimentology,1982,29:121-138.
[11]	Gao S,Collins M B.Changes in sediment transport directions caused by wave action and tidal flow time-asymmetry[J].Journal of Coastal Research,1997,13:198-201.
[12]	高抒.沉积物输运对砂质海底稳定性影响的评估方法及应用实例[J].海洋科学集刊,2001,43:25-37.[GAO Shu.Methods for evaluating influences of sediment transport on stability of sand seafloor and application cases[J].Studia marina Sinica,2001 ,43:25-37.]
[13]	Wood A M,Fleming R E.Coastal hydraulics[M].Macmillan,London,1981:280.
[14]	柯马尔.海滩过程和沉积作用[M].北京:海洋出版社,1985:286-290.[Komar P D.Beach Processes and Sedimentation[M].Beijing:China Ocean Press,1985:286 -290.]
[15]	Ludwick J C.Migration of tidal sand waves in Chesapeake Bay entrance[C]//Shelf Sediment Transport:Process and Pattern Dowden,Hutchinson and Ross,Stroudsburg,Pa.1972:377-410.
[16]	Boyd R.Time-sequence observations of wave-formed sand ripples on an ocean shoreface[J].Sedimentology,1988,35:449-464.
[17]	Fenster M S.Slability of giant sand waves in eastern Long Island sound,USA[J].Marine Geology,1990,91(9):207-225.
[18]	Berné.Pleistocene forced regressions and tidal sand ridges in the East China Sea[J].Marine Geology,2002,188:293-315.
[19]	王尚毅.南海珠江口盆地陆架斜坡及大陆架海底沙波动态分析[J].海洋学报,1994,16(6):122-132. [WANG Shang-yi.Seafloor ripple bedforms in continental shelf slope and shelf areas in the Zhujiang River mouth basin of the South China Sea[J].Acta Oceanologica Sinica,1994,16(6):122-132.]
[20]	夏东兴.海南东方岸外海底沙波活动性研究[J].黄渤海海洋,2001,19(1):17-24. [XIA Dong-xing.Seafloor sand wave activity off the eastern coast of Hainan[J].Journal of Oceanography of Huanghai & Bohai Seas,2001,19(1):17-24.]