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Understanding morphodynamic changes of a tidal river confluence through field measurements and numerical modeling
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.
2018 (English)In: Water, ISSN 2073-4441, E-ISSN 2073-4441, Vol. 10, no 10, article id 1424Article in journal (Refereed) Published
Abstract [en]

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-offand 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-offand 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.

Place, publisher, year, edition, pages
MDPI AG , 2018. Vol. 10, no 10, article id 1424
Keywords [en]
Field measurements, Flow features, Morphological changes, Numerical simulations, Tidal river confluence, Computer simulation, Floods, Flow velocity, Numerical models, Sedimentation, Shear flow, Shear stress, Tides, Field measurement, Natural components, Sediment concentration, Suspended load deposition, Tidal river, Two-dimensional hydrodynamic modeling, Rivers
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-247139DOI: 10.3390/w10101424ISI: 000451208400139Scopus ID: 2-s2.0-85054725343OAI: oai:DiVA.org:kth-247139DiVA, id: diva2:1301864
Note

QC 20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-03Bibliographically approved

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Yang, James

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  • apa
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  • vancouver
  • Other style
More styles
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  • de-DE
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  • en-US
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  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
  • html
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  • asciidoc
  • rtf