An evolution of subaqueous dune morphology: numerical experiments

DU Xiaoqin; GAO Shu

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DU Xiaoqin, GAO Shu. An evolution of subaqueous dune morphology: numerical experiments[J]. Haiyang Xuebao, 2012, 34(4): 121-134.

Citation:

DU Xiaoqin, GAO Shu. An evolution of subaqueous dune morphology: numerical experiments[J]. Haiyang Xuebao, 2012, 34(4): 121-134.

DU Xiaoqin, GAO Shu. An evolution of subaqueous dune morphology: numerical experiments[J]. Haiyang Xuebao, 2012, 34(4): 121-134.

Citation:

DU Xiaoqin, GAO Shu. An evolution of subaqueous dune morphology: numerical experiments[J]. Haiyang Xuebao, 2012, 34(4): 121-134.

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An evolution of subaqueous dune morphology: numerical experiments

DU Xiaoqin,
GAO Shu

Key Laboratory of Ministry of Education for Coast and Island Development, Nanjing University, Nanjing 210093, China

Received Date: 2010-08-01
Rev Recd Date: 2012-02-10

Abstract

Abstract

Subaqueous dunes are widely distributed in shallow marine environments. The morphological characteristics and the evolution of these bed forms have been a focus for many studies.The evolution of sand dunes associated with tidal flows is discussed using a one-dimensional modeling approach, in an attempt to identify the role played by the various factors and their interrelationships. The variables considered in this model include a water depth,a sediment grain size, and the thickness of sediment layer,and a typhoon. The simulation results show that the dune morphology and the evolution time are influenced by these factors. The spatial distribution of sand dunes is controlled by the flow field parameter; the dune height is influenced by the water depth,the sediment grain size and the thickness of sediment layer while the shape of sand dune depends on the thickness of sediment layer. The evolution time to reach equilibrium is controlled by all of the above factors. During a typhoon, the sediment is washed away from the ridge of dunes and then the heights decrease. Following the storm event, the sediment is transported back to the crest and the heights increase, however, several years are required to recover. The simulation results are consistent with the data of sand dunes from the Taiwan Bank in the Taiwan Strait and the southern North Sea in Europe.
- bed forms,
- subaqueous dunes,
- sediment transport,
- tidal action,
- process modeling,
- continental shelf environment

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References(31)

References

JOHNSON M A, STRIDE A H, BELDERSON R H, et al. Predicted sand wave formation and decay on a larger offshore tidal-current sand-sheet[J]. Special Publications of the International Association of Sediment, 1981, 5: 247-256.

LANGHORNE D N. An evaluation of Bagnold’s dimensionless coefficient of proportionality using measurements of sand wave movements[J]. Marine Geology, 1981, 43: 49-64.

钱宁,万兆惠.泥沙运动力学[M].北京:科学出版社,2003: 687.

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.

KNAAPEN M A F, HULSCHER S J M H. Regeneration of sand waves after dredging[J]. Coastal Engineering, 2002, 46: 277-289.

NMETH A A, HULSCHER S J M H, DE VRIEND H J. Modelling sand wave migration in shallow shelf seas[J].Continental Shelf Research, 2002,22: 2795-2806.

MORELISSEN R, HULSCHER S J M H, KNAAPEN M A F, et al. Mathematical modeling of sand wave migration and the interaction with pipelines[J]. Coastal Engineering, 2003, 48: 197-209.

FLEMMING B W. On the dimensional adjustment of subaqueous dunes in response to changing flow conditions: a conceptual process model // TRENTESAUX A, GARLAN T.Marine Sandwave Dynamics.France: University of Lille 1,2000:61-67.

FLEMMING B W. The role of grain size, water depth and flow velocity as scalling of factors controlling the size of subaqueous dunes //TRENTESAUX A,GARLAN T.Marine Sandwave Dynamics.France: University of Lille 1,2000: 55-60.

Off T. Rhythmic linear sand bodies caused by tidal currents[J]. Bulletin of the American Association of Petroleum Geologists, 1963, 47: 324-341.

HUTHNANCE J. On one mechanism forming linear sand banks[J]. Estuarine and Coastal Shelf Science, 1982,14: 77-99.

HUTHNANCE J. On the formation of sand banks of finite extent[J]. Estuarine and Coastal Shelf Science, 1982, 15: 277-299.

HULSCHER S J M H. Tidal induced larger-scale regular bed form patterns in a three-dimensional shallow water model[J]. Journal of Geophysical Research, 1996, 101(C9): 20727-20744.

FREDSE J, DEIGAARD R. Mechanics of coastal sediment transport[M]//Advanced Series on Ocean Engineering, Vol. 3.Singapore:World Scientific,1992: 260-289.

HULSCHER S J M H, DE SWART H E, DE VRIEND H J. The generation of offshore tidal sand banks and sand waves[J]. Continental Shelf Research, 1993, 13(11):1183-1204.

DE SWART H E, HULSCHER S J M H. Dynamics of larger-scale bed forms in coastal seas[M]// Nonlinear Dynamics and Pattern Formation in the Natural Environment. New York: Longman, White Plains, 1995: 315-331.

HULSCHER S J M H, DOHMEN-JANSSEN C M. Introduction to special section on marine sand wave and rive dune dynamics[J]. Journal of Geophysical Research, 2005, 110: F04S01.

ASHLEY G M.Classification of large-scale subaqueous bed forms: a new look at an old problem[J]. J Sediment Petrol, 1990, 60: 160-172.

MUIR WOOD A M, FLEMMING C A. Coastal Hydraulics[M].2nd ed.London: Macmillan, 1981: 280.

庄振业,曹立华,刘升发,等.陆架沙丘(波)活动量级和稳定性标志研究[J].中国海洋大学学报,2008,38(6):1001-1007.

许富祥.台湾海峡及其邻近海域灾害性海浪的时空分布[J].东海海洋,1998,16(3):14-17.

SOULSBY R L. Dynamics of Marine Sands[M]. London: Thomas Telford Services Limited, 1997: 249.

HARDISTY J. An assessment and calibration of formulations for Bagnold’s bedload equation[J]. Journal of Sedimentary Petrology, 1983, 53: 1007-1010.

WANG YP,GAO S. Modification to the Hardisty equation, regarding the relationship between sediment transport rate and particle size[J]. Journal of Sedimentary Research, 2001, 71(1):118-121.

MILLER M C, MCCAVE I N, KOMAR P D. Threshold of sediment motion under unidirectional currents[J]. Sedimentology, 1997, 24: 507-527.

VAN RIJN L C. Principles of Sediment Transport in Rivers, Estuaries and Coastal Seas[M]. Amsterdam: Aqua Publications, 1993: 673.

BAGNOLD R A. An Approach to the Sediment Transport Problem from General Physics[M].Washington, D.C.: Geological Survey Professional Paper, 1966: 422-Ⅰ.

Stam J M T. On the modeling of two-dimensional aeolian dunes[J]. Sedimentology, 1997, 44:127-141.

杜晓琴,李炎,高抒. 台湾浅滩大型沙波、潮流结构和推移质输运特征[J].海洋学报,2008,30(5):124-136.

ANTHONY D, LETH J O. Large-scale bed forms, sediment distribution and sand mobility in the eastern North Sea off the Danish west coast[J]. Marine Geology, 2002, 182: 247-263.

NÉMETH A A. Modelling offshore sand waves .Netherlands: University of Twente,2003.

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