Yongping Chen, Ninglin Jiang, Changkuan Zhang


The riverbed evolution of upper part of Yangtze estuary, Chengtong reach, is analyzed by comparison of 6 sets of bathymetry data during 1977~2011. The significant changes of water depth profiles along 6 representative cross-sections indicate the reach is still in the process of development. In order to get a better understanding of the effect of river discharge at upstream on the riverbed evolution of Chengtong reach, a series of numerical experiments are implemented by specifying different river discharge conditions at the upper boundary. The corresponding discharge ratio at main sub-reaches is compared to reveal the response of the riverbed evolution to the hydrodynamic changes at upstream. The results show that with the increase of river discharge, the discharge ratio in the main channels of Fujiangsha sub-reach and Rugaosha sub-reach increases, but it changes to decrease when the upstream river discharge becomes very large; however, the discharge ratio in the main channel of Tongzhousha sub-reach always decreases with the increase of river discharge at upstream.


Yangtze estuary; Chengtong reach; riverbed evolution; numerical modeling; upstream river discharge

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Jiang, C., Li, J. and Swart, H. E. 2011. Effects of navigational works on morphological changes in the bar area of the Yangtze Estuary. Geomorphology, 139-140, 205-219http://dx.doi.org/10.1016/j.geomorph.2011.10.020

Jiang, N., Chen, Y. and Fei, X. 2011. Analyses of riverbed evolution of Chengtong reach of the Yangtze River. Port & Waterway Engineering, 12, 112-115. (in Chinese)

Liu, J., Chen, J. and Xu, Z. 2007. Morphological Evolution and Its Response to the Navigational Improvements in the North Passage, Yangtze Estuary. China Ocean Engineering, 21(4), 611-624.

Wang, Y., Peter, V. and Wu, H. 2008. Long-term morphodynamic evolution and the equilibrium mechanism of a flood channel in the Yangtze Estuary. Geomorphology, 99(1-4), 130-138.http://dx.doi.org/10.1016/j.geomorph.2007.10.003

Yang, S., Zhao, Q. and Belkin, I. 2002. Temporal variation in the sediment load of the Yangtze River and the influences of human activities. Journal of Hydrology, 263, 56-71.http://dx.doi.org/10.1016/S0022-1694(02)00028-8

Yang, Z., Wang, H. and Saito, Y. 2006. Dam impacts on the Changjiang (Yangtze) River sediment discharge to the sea: The past 55 years and after the Three Gorges Dam. Water Resource Research, 42(4), W04407, doi:10.1029/2005WR003970.http://dx.doi.org/10.1029/2005WR003970

DOI: http://dx.doi.org/10.9753/icce.v33.sediment.92