Influence of bathymetry evolution on position of tidal shear front and hydrodynamic characteristics around the Yellow River estuary

doi:10.1007/s11707-012-0334-y

Front Earth Sci

2012, Vol. 6

Issue (4) : 405-419 https://doi.org/10.1007/s11707-012-0334-y

RESEARCH ARTICLE

Influence of bathymetry evolution on position of tidal shear front and hydrodynamic characteristics around the Yellow River estuary

Yucen LU, Yongming SHEN(

)

State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116023, China

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Abstract

A three dimensional numerical model based on the hydrodynamic module of finite-volume coastal ocean (FVCOM) was established for the Yellow River estuary. The model has been calibrated by observed data and proved to be suitable to reflect the hydrodynamic force in the research area. We employed the model to simulate the tidal shear front off the Yellow River estuary and analyzed the formation, spread and duration of two different types of shear front. To examine the effect of bathymetry evolution on the position of tidal shear front, subaqueous bathymetry of the Yellow River estuary was changed according to the changing patterns obtained from the past few years. Tidal shear front was modeled on both the original and the changed bathymetry. The results show that the position of shear front moved from a shallow to a deep area due to the deposition of bathymetry. The influence of bathymetry evolution on hydrodynamic characteristics including the distribution of salinity and the movement of particles was studied. We found the dispersion areas of low salinity became larger after changing bathymetry and the particles on the surface, middle and bottom layer are able to move further both north and west of Laizhou Bay on the changed bathymetry.

Keywords Yellow River estuary shear front hydrodynamic force bathymetry evolution salinity

Corresponding Author(s): SHEN Yongming,Email:ymshen@dlut.edu.cn

Issue Date: 05 December 2012

Cite this article:

Yucen LU,Yongming SHEN. Influence of bathymetry evolution on position of tidal shear front and hydrodynamic characteristics around the Yellow River estuary[J]. Front Earth Sci, 2012, 6(4): 405-419.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-012-0334-y
https://academic.hep.com.cn/fesci/EN/Y2012/V6/I4/405

Fig.1 Bathymetry of Laizhou Bay

Fig.2 Computational unstructured grid of Laizhou Bay

Fig.3 Locations of observed stations

Fig.4 Comparisons of observed and modeled tidal elevation ((a) and (b) are for D1 and D2, (c) and (d) are for Yangjiaogoukou (YJGK) and Longkou (LK))

Fig.5 Comparisons of observed and modeled current velocity and direction(A1, A2, A3, A4, B1, B2, B3, B4, C1, C2,)

Fig.6 Co-amplitude line (solid line, in cm) and co-phase line (dashed line, in degree) of M, S, O and K

Fig.7 Comparison of surface salinity between simulation and observation at two observed stations

Fig.8 Comparison of simulated and observed salinity distribution on the surface around the Yellow River estuary

Fig.9 Locations of transects

Fig.10 Comparison of simulated and observed longitudinal salinity distribution along transect 1 (T1-T2-T3)

Fig.11 Two types of tidal shear front off the Yellow River estuary

Fig.12 Current vectors of tidal currents along transects 2 (a) and 3 (b)

Tab.1 Moving distance of isobaths

Fig.13 Original bathymetry (a) and changed bathymetry (b)

Fig.14 Comparison of position of tidal shear front and salinity distribution of the surface layer on the original bathymetry ((a),(c)) and changed bathymetry ((b),(d))

Fig.15 Comparison of longitudinal salinity distribution along transect 2 (F1-F2-F3-F4) on the original bathymetry (a) and changed bathymetry (b)

Fig.16 Initial positions of tracers around Yellow River estuary

Fig.17 Positions of the tracers on the original bathymetry and the changed one, (a) and (b) are the snapshots for 10 days, (c) and (d) are the snapshots for 20 days, (e) and (f) are the snapshots for 30days. (a), (c), (e) represent for the positions on the original bathymetry, while (b), (d), (f) represent for the positions on the changed bathymetry

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