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Open AccessArticle

Understanding Morphodynamic Changes of a Tidal River Confluence through Field Measurements and Numerical Modeling

1
Division of Fluid and Experimental Mechanics, Luleå University of Technology (LTU), 97187 Luleå, Sweden
2
Division of Resources, Energy and Infrastructure, Royal Institute of Technology (KTH), 10044 Stockholm, Sweden
3
Vattenfall AB, Research and Development (R & D), Älvkarleby Laboratory, 81426 Älvkarleby, Sweden
4
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
*
Author to whom correspondence should be addressed.
Water 2018, 10(10), 1424; https://doi.org/10.3390/w10101424
Received: 20 August 2018 / Revised: 4 October 2018 / Accepted: 8 October 2018 / Published: 11 October 2018
A confluence is a natural component in river and channel networks. This study deals, through field and numerical studies, with alluvial behaviors of a confluence affected by both river run-off and strong tides. Field measurements were conducted along the rivers including the confluence. Field data show that the changes in flow velocity and sediment concentration are not always in phase with each other. The concentration shows a general trend of decrease from the river mouth to the confluence. For a given location, the tides affect both the sediment concentration and transport. A two-dimensional hydrodynamic model of suspended load was set up to illustrate the combined effects of run-off and tidal flows. Modeled cases included the flood and ebb tides in a wet season. Typical features examined included tidal flow fields, bed shear stress, and scour evolution in the confluence. The confluence migration pattern of scour is dependent on the interaction between the river currents and tidal flows. The flood tides are attributable to the suspended load deposition in the confluence, while the ebb tides in combination with run-offs lead to erosion. The flood tides play a dominant role in the morphodynamic changes of the confluence. View Full-Text
Keywords: tidal river confluence; flow features; morphological changes; field measurements; numerical simulations tidal river confluence; flow features; morphological changes; field measurements; numerical simulations
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MDPI and ACS Style

Xie, Q.; Yang, J.; Lundström, S.; Dai, W. Understanding Morphodynamic Changes of a Tidal River Confluence through Field Measurements and Numerical Modeling. Water 2018, 10, 1424. https://doi.org/10.3390/w10101424

AMA Style

Xie Q, Yang J, Lundström S, Dai W. Understanding Morphodynamic Changes of a Tidal River Confluence through Field Measurements and Numerical Modeling. Water. 2018; 10(10):1424. https://doi.org/10.3390/w10101424

Chicago/Turabian Style

Xie, Qiancheng; Yang, James; Lundström, Staffan; Dai, Wenhong. 2018. "Understanding Morphodynamic Changes of a Tidal River Confluence through Field Measurements and Numerical Modeling" Water 10, no. 10: 1424. https://doi.org/10.3390/w10101424

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