北部湾南部海域近底悬沙输运及地貌演变

马小川; 阎军; 范奉鑫; 王诗文; 姚平

北部湾南部海域近底悬沙输运及地貌演变

1.
中国科学院海洋研究所, 中国科学院海洋地质与环境重点实验室, 山东青岛 266071;中国科学院研究生院, 北京 100049
2.
中国科学院研究生院, 北京 100049
3.
国家海洋局南海分局海口海洋环境监测中心站, 海南海口 570311
4.
中海石油(中国)有限公司湛江分公司, 广东湛江 524057

基金项目: 中国科学院知识创新重要方向项目(KZCX2-YW-212-2)。

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出版历程
- 收稿日期: 2010-10-09
- 修回日期: 2011-04-21

Bedform dynamics and suspended sediment transport near sea bottom in the south of Beibu Gulf

1.
Graduate School of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
3.
Haikou Marine Environment Monitoring Center Station, State Oceanic Administration, Haikou 570311, China
4.
Zhanjiang Branch of CNOOC Ltd, Zhanjiang 524057, China

摘要

摘要: 利用1个海洋沉积动力过程原位监测系统在北部湾南部浅海陆架海域采集了18个潮周期的波浪、潮流、悬浮沉积物浓度、底床变化数据,分析了悬沙浓度变化特征,计算了近底悬沙通量并分析了潮流和波浪对底床演变的影响,结果表明:观测期间近底悬沙浓度的变化主要受水位波动、潮流的共同影响,波浪作用较弱;悬沙浓度的异常高值可能是上游沙波表面的泥沙滑落沉降所致;观测期间悬沙通量的波动规律与近底潮流速度变化一致,潮周期和涨落潮之间的悬沙通量有显著差别;在潮流作用下观测期间悬沙向西的净输运量约为15 158 kg/m,向北净悬沙通量为2 934 kg/m,东西向净通量远大于南北向净通量;近东西向波谷地形对南北向悬沙输运的限制作用可能导致了输运通量的显著差异;底床高程的变化在潮周期之间有差异,变化值在0.8~16.7 cm之间波动,厘米级底床高程的快速变化主要是由潮流流速的大小及往复潮流的不对称性造成的。这种变化可能与沙纹的运移有关,沉积物向下游方向的运移以及沙纹剖面形态的改变可以较合理地解释底床高程的变化特点。
- 北部湾 /
- 悬沙 /
- 地貌演变 /
- 潮流 /
- 底部切应力
Abstract: A platform with autonomous instruments was deployed over a period of 18 tide cycles in the south of Beibu Gulf to investigate sand transport and bedform dynamics, which collected continuous data of wave, current, SSC, and seabed changes. Analyses have been undertaken of SSC characteristics, suspended sediment flux, and the effect of current and wave on bedform dynamics and SSC variation. Results suggested that over the measurement period SSC variation was mainly affected by water-level fluctuation and current while wave was a less important factor. The exceedingly high SSC was probably caused by sediment sliding off the upstream sand wave. Suspended sediment flux changes comported with current velocity. There were presented remarkable variations of suspend sediment flux during flood-ebb and among tide cycles. A net transport for suspended sediment towards west and north were 15 158 kg·m^-1 and 2 934 kg·m^-1 respectively, the former of which was much larger than the latter under current. The limit of the EW-trending trough could lead to great difference between net transport flux in EW and in NS. The changes of seabed elevation varied among tide circles between 0.8 cm and 16.7 cm, which cm-scale bed level change in one tide cycle was probably generated by varying current velocity and asymmetric reversing current. These changes were most likely associated with migration of ripples. Sediment transporting downstream and modification of ripples’ profile gave reasonable interpretation of variation characteristics of seabed eletration.
- Beibu Gulf /
- suspended sediment /
- bedform dynamics /
- current /
- bottom shear stress

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参考文献(33)

VAN RIJN L C. Unified view of sediment transport by currents and waves:Ⅰ.Inition of motion, bed roughness, and bed-load transport[J]. Journal of Hydraulic Engineering, ASCE, 2007,133(6):649-667.

SOULSBY R L, DAMGAARD J S. Bedload sediment transport in coastal waters[J]. Coastal Engineering, 2005,52:673-689.

BETTERIDGE K F E, THORNE P D, COOKE R D. Calibrating multi-frequency acoustic backscatter systems for studying near-bed suspended sediment transport processes[J].Continental Shelf Research, 2008,28:227-235.

GREEN M O, VINCENT C E, MCCAVE I N, et al. Storm sediment transport: observations from the British North Sea shelf[J]. Continental Shelf Research, 1995,15:889-912.

WILLIAMS J J, HUMPHERY J D, HARDCASTLE P J, et al. Field observations of hydrodynamic conditions and suspended particulate matter in the southern North Sea[J]. Continental Shelf Research, 1998,18:1215-1233.

HULSCHER S J M H, VAN DEN BRINK G M. Comparison between predicted and observed sand waves and sand banks in the North Sea[J]. Journal of the Geophysical Research, 2001,106 (C5):9327-9338.

VAN DER MOLEN J. The influence of tides, wind and waves on the net sand transport in the North Sea[J]. Continental Shelf Research, 2002,22: 2739-2762.

CACCHIONEA D A, THORNEB P D, AGRAWAL Y. Time-averaged near-bed suspended sediment concentrations under waves and currents: Comparison of measured and model estimates[J]. Continental Shelf Research, 2008,28:470-484.

MADSEN O S, WRIGHT L D, BOON J D, et al. Wind stress, bed roughness and sediment suspension on the inner shelf during an extreme storm event[J]. Continental Shelf Research,1993,13:1303-1324.

SHERWOOD C R, BUTMAN B, CACCHIONE D A, et al. Sediment-transport events on the northern California continental shelf during the 1990-1991 STRESS experiment[J]. Continental Shelf Research, 1994,14:1063-1099.

汪亚平,高抒,贾建军.浪流联合作用下潮滩沉积动力过程的高分辨率数据采集与分析[J].科学通报, 2006,51(3):339-348.

王初,贺宝根,周乃晟,等.长江口崇明东滩盐沼前缘地带悬浮泥沙横向通量的潮周期变化[J].海洋学报, 2009,31(1):143-151.

杨世伦,李鹏,皓昂,等.基于ADP-XR和OBS-3A的潮滩水文泥沙过程研究——以胶州湾北部红岛潮滩为例[J].海洋学报, 2006,28(5):56-63.

奉仰崇.面对北部湾的思考:关于环北部湾海岸的开发与保护[J].海洋开发与管理,1999, 16(2):14-17.

曹立华,徐继尚,李广雪,等.海南岛西部岸外沙波的高分辨率形态特征[J].海洋地质与第四纪地质,2006,26(4):15-22.

王伟伟,范奉鑫,李成刚,等.海南岛西南海底沙波活动及底床冲淤变化[J].海洋地质与第四纪地质, 2007,27(4):23-28.

王颖.海南岛海岸环境特征[J].海洋地质动态, 2002,18(3):1-9.

王伟伟.典型海域海底底床稳定性研究 .北京:中国科学院研究生院,2007.

赵俊生,王桂云,陈则实,等.海洋环境有效利用的分析研究:北部湾广西沿岸海域[M].北京:海洋出版社,2002.

高抒,方国洪,于克俊,等.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.

于克俊,方国洪,王新怡,等.北部湾台风风海流三维数值后报[J].海洋科学集刊,1995,36:55-64.

王文质.北部湾寒潮风浪谱的初步分析[J].南海海洋科学集刊, 1981,2:79-92.

高为利,张富元,章伟艳,等. 海南岛周边海域表层沉积物粒度分布特征[J]. 海洋通报, 2009, 28(2): 71-80.

BAI X F, LI S R, GONG D J, et al. Estimation of suspended sediment concentrations using pulse-coherent acoustic Doppler profiler (PCADP)[J]. Chinese Journal of Oceanology and Limnology, 2009,27(2):260-265.

VAN RIJN L C. Principles of Sediment Transport in Rivers, Estuaries and Coastal Seas[M].Amsterdam: Aqua Publication, 1993.

SWART D H.Predictive equations regarding coastal transports //Proceedings 15th Conference on Coastal Engineering,1976,Vol.2,Ch.66.

LI M Z, AMOS C L.SEDTRANS96:the upgraded and better calibrated sediment-transport model for continental shelves[J].Computer & Geosciences, 2001,27:619-645.

汪亚平,高抒,贾建军.海底边界层水流结构及底移质搬运研究进展[J].海洋地质与第四纪地质, 2000,20(3):101-106.

王元叶.细颗粒泥沙近底边界层观测和模型研究 .上海:华东师范大学, 2007.

CHEN SH L. Seasonal, Neap-spring variation of sediment concentration in the joint area of Yangtze Estuary and Hangzhou Bay[J]. SCIENCE IN CHINA(Series B), 2001, 44(Supp.):57-62.

陈沈良,张国安,杨世伦,等.长江口水域悬沙浓度时空变化与泥沙再悬浮[J].地理学报, 2004, 59(2): 260-266.

HYUNG R J,HEE J L. Bedform dynamics and sand transport pathways in the Garolim Bay tidal flat, west coast of Korea[J]. Geosciences Journal, 2008,12(3):299-308.

HOEKSTRA P, BELL P, VAN SANTEN P, et al. Bedform migration and bedload transport on an intertidal shoal[J]. Continental Shelf Research, 2004,24:1249-1269.

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