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Research Papers: Ocean Engineering

A Flow-Sediment Numerical Model Using One and Two Dimensions for the Yongding New Estuary

[+] Author and Article Information
Xingchen Tang

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300354, China
e-mail: xingchentang1108@yeah.net

Daming Li

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300354, China
e-mail: lidaming@tju.edu.cn

Xiao Wang

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300354, China
e-mail: wxch@tju.edu.cn

Yanqing Li

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300354, China
e-mail: vincent109@tju.edu.cn

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received October 25, 2017; final manuscript received May 30, 2018; published online July 24, 2018. Assoc. Editor: David R. Fuhrman.

J. Offshore Mech. Arct. Eng 140(6), 061102 (Jul 24, 2018) (14 pages) Paper No: OMAE-17-1198; doi: 10.1115/1.4040507 History: Received October 25, 2017; Revised May 30, 2018

This paper derived the continuity and momentum equations of solid–liquid two-phase flows using infinitesimal body analysis and obtained well-posed equations of two-dimensional (2D) flow-sediment movement. Based on the theory of solid–liquid two-phase flow, the momentum equations of the bedload sediment were deduced and a closed form of the 2D total sediment model equations was established. Then, the exchange mechanism of suspended sediment and bedload sediment and their computational method were elaborated on in great detail. Combined with the basic theory of one-dimensional (1D) flow-sediment movement, a flow-sediment numerical model of one and two dimensions was established for the region of Yongding New Estuary. A series of model verifications were carried out, which showed that the model can be adopted to simulate the flow-sediment movement in this region. This model was then applied for the environmental assessment of Taida Sea Reclamation Project. The conclusions indicate that the backwater effects of the proposed construction scheme would be fairly small and that the deposition amount in the river would be greatly reduced owing to the source of alongshore sediment transport being blocked by the project. This study provides a scientific model and method for the feasibility study and environmental assessments of construction projects.

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Figures

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Fig. 1

(a) Satellite remote sensing image of the Yongding New Estuary and (b) the model domain

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Fig. 2

Sketched map of the infinitesimal body

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Fig. 3

Velocity variations in the x direction of the cylinder

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Fig. 4

Pressure variations in the x direction of the cylinder

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Fig. 5

Exchange process of suspended sediment and bedload sediment

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Fig. 6

Distribution of 1D river sections

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Fig. 7

Two-dimensional total sediment model domain and its grids

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Fig. 8

Survey stations for tidal currents, suspended sediment, and bathymetry

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Fig. 9

Distribution of the median grain diameters (d50) of the bottom materials in the region of the Yongding New Estuary

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Fig. 10

Comparison of the sediment concentrations of the calculated (solid line) and the observed (scattered points) results of (a) section 43 + 000, (b) section 59 + 000, and (c) section 63 + 000

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Fig. 11

Comparisons of the current velocities, current directions and tidal levels of the calculated (solid line) and the observed (scattered points) results at (a) station 5#, (b) station 8#, and (c) station 13#

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Fig. 12

Distributions of the flow fields at (a) flood period and (b) ebb period

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Fig. 13

Comparison of the sediment concentrations of the calculated (solid line) and observed (scattered points) values at (a) station 5#, (b) station 8#, and (c) station 13#

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Fig. 14

Comparison of the erosion/deposition contours of the measured (a) and the modeled (b) results

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Fig. 15

Model grid after the construction of the project

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Fig. 16

River-water surface curve under the designed flood condition (The solid line shows before construction, and the dashed line shows after construction. This is also used below.)

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Fig. 17

River-water surface curve under the calibration flood conditions

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Fig. 18

River-water surface curve under the present flood discharge capacity

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Fig. 19

Distribution of the annual average deposition thicknesses along the river

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Fig. 20

Cumulative of annual deposition amount along the river

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Fig. 21

Distribution of the annual erosion/deposition thickness in the estuary

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