The University of Southampton
University of Southampton Institutional Repository

Seasonal variation of river and tide energy in the Yangtze estuary, China

Seasonal variation of river and tide energy in the Yangtze estuary, China
Seasonal variation of river and tide energy in the Yangtze estuary, China
In many large estuaries there are significant variations in flow conditions due to the interaction between tide (with spring–neap changes) and river discharge (with wet–dry seasons), which is key to understanding the evolution of the morphology and the resultant equilibrium state. To explore whether there exists an equilibrium state, and what might control such a state in such a dynamic environment, both numerical and analytical methods have been used to investigate the relative importance of tide and river contributions to the work done locally and globally over a wide range of discharge conditions in the Yangtze estuary. In particular, we have quantified the contributions from the tidal flow, the river flow and the tide–river interaction in terms of energy and its dissipation under different river discharge conditions. Model results suggest that there is a state of minimum tidal work for the case representing the wet season, when river and tide are doing uniform work locally and minimum work globally, within the bi-directional tidal reach for tide and along the whole estuary for river. We also observe that the system is not optimized for other conditions (peak discharge and low flows during the dry season), but the system would tend to do the minimum work possible given the constraints on the system (e.g. imposed forcing conditions and available sediment supply). Results, therefore, are consistent with the use of these two energetic optimization principles, and the proposed method could be applicable to other alluvial estuaries.
Yangtze estuary, river–tide interaction, hydraulics, energy, equilibrium
0197-9337
98-116
Zhang, Min
b05c2fb3-97e7-49a1-9a42-ca8a7c0cc4f0
Townend, Ian
f72e5186-cae8-41fd-8712-d5746f78328e
Zhou, Yunxuan
bc6ecb4c-5937-4580-950a-6997b7e5a903
Cai, Huayang
1cb6d8e3-58d5-4d01-b825-fbe920a4f219
Zhang, Min
b05c2fb3-97e7-49a1-9a42-ca8a7c0cc4f0
Townend, Ian
f72e5186-cae8-41fd-8712-d5746f78328e
Zhou, Yunxuan
bc6ecb4c-5937-4580-950a-6997b7e5a903
Cai, Huayang
1cb6d8e3-58d5-4d01-b825-fbe920a4f219

Zhang, Min, Townend, Ian, Zhou, Yunxuan and Cai, Huayang (2016) Seasonal variation of river and tide energy in the Yangtze estuary, China. Earth Surface Processes and Landforms, 41 (1), 98-116. (doi:10.1002/esp.3790).

Record type: Article

Abstract

In many large estuaries there are significant variations in flow conditions due to the interaction between tide (with spring–neap changes) and river discharge (with wet–dry seasons), which is key to understanding the evolution of the morphology and the resultant equilibrium state. To explore whether there exists an equilibrium state, and what might control such a state in such a dynamic environment, both numerical and analytical methods have been used to investigate the relative importance of tide and river contributions to the work done locally and globally over a wide range of discharge conditions in the Yangtze estuary. In particular, we have quantified the contributions from the tidal flow, the river flow and the tide–river interaction in terms of energy and its dissipation under different river discharge conditions. Model results suggest that there is a state of minimum tidal work for the case representing the wet season, when river and tide are doing uniform work locally and minimum work globally, within the bi-directional tidal reach for tide and along the whole estuary for river. We also observe that the system is not optimized for other conditions (peak discharge and low flows during the dry season), but the system would tend to do the minimum work possible given the constraints on the system (e.g. imposed forcing conditions and available sediment supply). Results, therefore, are consistent with the use of these two energetic optimization principles, and the proposed method could be applicable to other alluvial estuaries.

Text
Submitted manuscript
Download (300kB)

More information

Accepted/In Press date: 20 July 2015
Published date: January 2016
Keywords: Yangtze estuary, river–tide interaction, hydraulics, energy, equilibrium
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 390974
URI: http://eprints.soton.ac.uk/id/eprint/390974
ISSN: 0197-9337
PURE UUID: 62afb4ea-fee8-4933-87c1-16958a9411e1
ORCID for Ian Townend: ORCID iD orcid.org/0000-0003-2101-3858

Catalogue record

Date deposited: 07 Apr 2016 10:57
Last modified: 28 Apr 2022 01:49

Export record

Altmetrics

Contributors

Author: Min Zhang
Author: Ian Townend ORCID iD
Author: Yunxuan Zhou
Author: Huayang Cai

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×