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Article

The Response of Lateral Flow to Peak River Discharge in a Macrotidal Estuary

by 1,2,3, 1,2,*, 1,2,3 and 1,2
1
Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao 266100, China
2
Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
3
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3571; https://doi.org/10.3390/w12123571
Received: 22 November 2020 / Revised: 13 December 2020 / Accepted: 15 December 2020 / Published: 19 December 2020
(This article belongs to the Special Issue Hydrodynamics in Estuaries and Coast: Analysis and Modeling)
The Ou River, a medium-sized river in southeastern China, is selected to study the lateral flow response to rapidly varied river discharge, i.e., peak river discharge (PRD). A three-dimensional model based on the Finite-Volume Community Ocean Model is validated by in situ measurements from 15 June to 16 July 2005. PRD, which considers the extra buoyancy and longitudinal momentum in a short time, rebuilds the stratification and lateral flow. PRD, compared with low-discharge, generally makes stratification stronger and lateral flow weaker. PRD mainly rebuilds lateral flow by changing lateral advection, lateral Coriolis, and lateral-barotropic pressure gradient terms. After PRD, the salinity recovery time is longer than that of the flow because the impact on buoyancy lasts longer than that on longitudinal flow. Longitudinal flow is mostly affected by the momentum transferred during PRD; therefore, the recovery time is close to the flooding duration. However, the lateral flow is affected by the buoyancy, and its recovery time is generally longer than the flooding duration. The lateral flow recovery time depends on transect width, flow velocity and the variation caused by PRD. PRD occurs widely in global small-/medium-sized river estuaries, and the result of this work can be extended to other estuaries. View Full-Text
Keywords: small-/medium-sized river estuary; lateral flow; peak river discharge; momentum balance; recovery time; FVCOM small-/medium-sized river estuary; lateral flow; peak river discharge; momentum balance; recovery time; FVCOM
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MDPI and ACS Style

Yan, Y.; Song, D.; Bao, X.; Ding, Y. The Response of Lateral Flow to Peak River Discharge in a Macrotidal Estuary. Water 2020, 12, 3571. https://doi.org/10.3390/w12123571

AMA Style

Yan Y, Song D, Bao X, Ding Y. The Response of Lateral Flow to Peak River Discharge in a Macrotidal Estuary. Water. 2020; 12(12):3571. https://doi.org/10.3390/w12123571

Chicago/Turabian Style

Yan, Yuhan, Dehai Song, Xianwen Bao, and Yang Ding. 2020. "The Response of Lateral Flow to Peak River Discharge in a Macrotidal Estuary" Water 12, no. 12: 3571. https://doi.org/10.3390/w12123571

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