Abstract
This study presents an incorporation and application of a two-dimensional, unstructured-grid hydrodynamic model with a suspended sediment transport module in Daishan, China. The model is verified with field measurement data from 2017: water level, flow velocities and suspended sediment concentration (SSC). In the application on the Daishan, the performance of the hydrodynamic model has been satisfactorily validated against observed variations of available measurement stations. Coupled with the hydrodynamic model, a sediment transport model has been developed and tested. The simulations agreed quantitatively with the observations. The validated model was applied to the construction of breakwaters and docks under a different plan. The model can calculate the flow field and siltation situation under different breakwater settings. After we have analyzed the impact of existing breakwater layout schemes and sediment transport, a reasonable plan will be selected. The results show that the sea area near the north of Yanwo Shan and Dongken Shan has a large flow velocity exceeding 2.0 m/s and the flow velocity within the isobath of 5 m is small, within 0.6 m/s. According to the sediment calculation, the dock project is feasible. However, the designed width of the fairway should be increased to ensure the navigation safety of the ship according to variation characteristics of cross flow velocity in channel.
Highlights
Suspended sediment concentration (SSC) in tidal estuaries can affect the physical, chemical and biological environment of the water column [1,2,3]
The main part of the water continues to move westward and a small part of the water flows to the south side of the coastal waters to form a large area of reflow
The water flows from the northwest side of the project sea area into the sea near the breakwater
Summary
Suspended sediment concentration (SSC) in tidal estuaries can affect the physical, chemical and biological environment of the water column [1,2,3]. Suspended sediments can change light attenuation and affect the cycle of nutrients, organic micropollutants and heavy metals [4,5]. Knowledge of suspended sediment dynamics is essential for quantifying the fluxes of ecologically and chemically important substances and determining the fate of pollutants [6,7]. The construction of coastal engineering could have a great influence on the hydrodynamics, seabed evolution and ecological. Understanding and predicting the influences of coastal engineering on sediment transport can provide a basis for understanding the changes of hydrodynamics
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