Characteristics of the large-scale sandwaves, tidal flow structure and bedload transport over the Taiwan Bank in southern China

DU Xiao-qin; LI Yan; GAO Shu

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DU Xiao-qin, LI Yan, GAO Shu. Characteristics of the large-scale sandwaves, tidal flow structure and bedload transport over the Taiwan Bank in southern China[J]. Haiyang Xuebao, 2008, 30(5): 124-136.

Citation:

DU Xiao-qin, LI Yan, GAO Shu. Characteristics of the large-scale sandwaves, tidal flow structure and bedload transport over the Taiwan Bank in southern China[J]. Haiyang Xuebao, 2008, 30(5): 124-136.

DU Xiao-qin, LI Yan, GAO Shu. Characteristics of the large-scale sandwaves, tidal flow structure and bedload transport over the Taiwan Bank in southern China[J]. Haiyang Xuebao, 2008, 30(5): 124-136.

Citation:

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Characteristics of the large-scale sandwaves, tidal flow structure and bedload transport over the Taiwan Bank in southern China

1.
Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China
2.
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China

Received Date: 2008-03-17
Rev Recd Date: 2008-07-02

Abstract

Abstract

On the basis of the measurement of current velocity within the water column,water depth and physical properties of seawaterover the Taiwan Bank in August 2006,the spatial and temporal characteristics of current velocities over large-scale sandwaves,together with the process of sediment transport,are analyzed.The results show that the sandwaves,14.4~20.3 min heightand 325.4~821.8 min length, are formed under the conditions of strong currentthat is acting upon the bed consisting of coarse-grained sediments,with a height-length relationship similar to those identified elsewhere in previous studies.Currents at the sandwave crest,trough,stoss-side and lee-side turn in a clockwise manner with a period of 12.5 h.In the bottom layer of the water column,the largest velocity occurred at the same phase of each semidiurnal cycle,which was directed to the south;furthermore,the velocities on the stoss-side are larger than on the lee-side.During the two semidiurnal tidal cycles,the amount of sediment im ported into the study area was larger than out put,indicating that accretion was taking place.The sediment transported by tidal current was relatively weak,which could cause only slow migration of sandwaves.However,according to satel lite observations,the sandwave migration can be high over the Taiwan Bank.This phenomenon may be caused by the strong currents asso ciated with storm events.At the cross-section studied,sediment transport was more intensive during the flood than during the ebb,and the net fluxes varied for different semidiurnal tidal cycles,indicating the effects of the time-velocity asymmetry and the tide phase.
- bedforms,
- bedload transport,
- current structures,
- Taiwan Bank in southern China,
- Taiwan Strait

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References(47)

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