Modeling the morphodynamic response of a large tidal channel system to the large-scale embankment in the Hangzhou Bay, China

被引：4
作者：
Xie D. [1 ]
机构：
[1] Zhejiang Provincial Key Laboratory for Estuarine and Coastal Research, Zhejiang Institute of Hydraulics and Estuary, Hangzhou
来源：
Anthropocene Coasts | 2018年 / 1卷 / 1期
基金：
中国国家自然科学基金;
关键词：
Anthropogenic activity; Hangzhou Bay; Morphodynamics; Numerical model; Tidal channel;
D O I：
10.1139/anc-2018-0003
中图分类号：
学科分类号：
摘要：
A large tidal channel has developed along the northern shore of the Hangzhou Bay. Its length and width are about 50 and 10 km, respectively. It serves as an important navigation channel and provides port construction locations. This contribution investigates the morphological response of the tidal channel to the large-scale embankment in recent decades and the physical mechanisms, based on an idealized 2D morphodynamic model. The tidal channel was reproduced within a timescale of several years, with spatial scales comparable to the real situation. The results showed that the macroscopic sediment transport pattern in the bay, namely, entering in the north and leaving in the south, was not changed by the embankment. The tidal range and sediment flux increased to a certain extent, because of the decrease of the cross-sectional width. Meanwhile, the longitudinal gradient of the residual sediment transport enlarged slightly. As a result, the tidal channel was eroded significantly, because of the nonlinear interaction among hydrodynamics, sediment transport, and morphological change. Furthermore, there are inherent connections among the main morphological features in the bay. Complementary to other approaches, this model provides a useful tool to predict the morphodynamic behavior for the estuarine planning and regulations. © 2018, Canadian Science Publishing. All rights reserved.
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页码：89 / 100
页数：11
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共 35 条
  • [1] Berthot A., Pattiaratchi C., Maintenance of headland-associated linear sandbanks: Modelling the secondary flows and sediment transport, Ocean Dyn, 55, pp. 526-540, (2005)
  • [2] Bolle A., Wang Z.B., Amos C.L., de Ronde J., The influence of changes in tidal asymmetry on residual sediment transport in the Western Scheldt, Cont. Shelf Res., 30, 8, pp. 871-882, (2010)
  • [3] Cao P.K., Gu G.C., Dong Y.F., Hu F.X., Basic characteristics of sediment transport in Hangzhou Bay, J. East China Norm. Univ. Nat. Sci., 3, pp. 75-84, (1985)
  • [4] Chen J.Y., Liu C.Z., Zhang C.L., Walker H.J., Geomorphological development and sedimentation in Qiantang Estuary and Hangzhou Bay, J. Coast. Res., 6, pp. 559-572, (1990)
  • [5] Dai Z.-J., Liu J.T., Xie H.-L., Shi W.-Y., Sedimentation in the outer Hangzhou Bay, China: The influence of Changjiang sediment load, J. Coast. Res., 30, pp. 1218-1225, (2014)
  • [6] Delft3d Flow User Manual, (2016)
  • [7] Dyer K.R., Estuaries — a Physical Introduction, 195, (1997)
  • [8] Editorial Committee for Chinese Harbors and Embayment (ECCHE). 1992. Chinese Harbors and Embayment (Part V)
  • [9] Friedrichs C.T., Aubrey D.G., Tidal propagation in strongly convergent channels, J. Geophys. Res.: Oceans, 99, C2, pp. 3321-3336, (1994)
  • [10] Gao S., Holocene shelf-coastal sedimentary systems associated with the Changjiang River: An overview, Acta Oceanol. Sin., 32, 12, pp. 4-12, (2013)
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