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Dynamic analysis of riverbed evolution: Chengtong Reach of Yangtze Estuary

Chen, Yongping, Li, Jiangxia, Wu, Zhigang and Pan, Shunqi 2016. Dynamic analysis of riverbed evolution: Chengtong Reach of Yangtze Estuary. Journal of Coastal Research SI 75 (V1) , pp. 203-207. 10.2112/SI75-041.1

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Abstract

This paper proposes a new approach to improve the analysis by extensively using the numerical model results. A 2D hydrodynamic model based on the Delft 3D suite is first set up and validated with the field measurement data. The model is then used to examine the hydrodynamic responses of the estuary to the change of local bathymetry or upstream discharge. This approach is applied to the Chengtong Reach of Yangtze Estuary as an example. The net discharge ratio (NDR) is used as an index to demonstrate the trend of channel development. The results show that the net discharge ratios (NDRs) at the main channels of Fujiangsha, Tongzhousha and Langshansha sub-reaches decrease with increase of upstream river discharge in general; however, the NDR at the main channel of Rugaosha sub-reach increases first, and then decreases with increase of upstream river discharge when the river discharge is larger than 45,000 m3/s. This difference is related to the local bathymetry as well as the ebb-dominated or flood dominated characters in those sub-reaches.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Uncontrolled Keywords: Numerical modelling, net discharge ratio, channel development, Yangtze estuary, Chengtong reach, riverbed evolution, upstream discharge
Publisher: Coastal Education and Research Foundation (CERF).
ISSN: 0749-0208
Related URLs:
Date of Acceptance: 15 January 2016
Last Modified: 19 Oct 2019 03:15
URI: http://orca-mwe.cf.ac.uk/id/eprint/93809

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