Sediment management in coastal infrastructures: techno-economic and environmental impact assessment of alternative technologies to dredging.

Physical model study for effects of the Hong Kong–Zhuhai–Macao Bridge on harbors and channels in Lingdingyang Bay of the Pearl River Estuary

Li, M.; Li, W.; Xie, M., and Xu, T., 2021. Morphodynamic responses to the Hong Kong–Zhuhai–Macao Bridge in the Pearl River estuary, China. Journal of Coastal Research, 37(1), 168–178. Coconut Creek (Florida), ISSN 0749-0208.Human activities such as constructing large bridges, performing land reclamation, and creating harbors in complex tidal estuaries can result in severe and undesirable morphodynamic responses. This study investigates morphodynamic responses to the construction of the Hong Kong–Zhuhai–Macao Bridge (HZMB) in Lingdingyang Bay of the Pearl River estuary (LBPRE). The LBPRE in China is an important estuary with unique geomorphic features, complex hydrodynamic sediment conditions, dense shipping routes, high ship density, and a high navigation grade. The HZMB, a major sea-crossing transportation project consisting of bridges, a tunnel, and man-made islands, is being designed to cross the LBPRE. The morphodynamic responses resulting from the HZMB are likely to be significant. Therefore, it is necessary to carry out studies to optimize the HZMB design to minimize its impacts on hydrodynamics, sediment environment, harbors, and navigational channels as much as possible. In this article, the natural hydrodynamic and sediment conditions are first analyzed on the basis of in situ data. Next, a numerical model of tidal current, sediment movement, and seabed deformation based on TK-2D software is set up with an irregular triangular grid. The model is calibrated with in situ data, and the results show that the calculated tidal levels, tidal currents, suspended load concentrations, and seabed deformations are all in good agreement with field data. The model is then applied to carry out high-resolution simulations for design optimization of the HZMB from the perspective of its impacts on morphodynamics and hydrodynamics, as well as on harbors and channels. The study shows that the proposed HZMB design is feasible in terms of the morphodynamic responses. The conclusions provide an important foundation for the construction of the HZMB project.

Morphodynamic Responses to the Hong Kong–Zhuhai–Macao Bridge in the Pearl River Estuary, China

Wave Characteristics and Berthing Capacity Evaluation of the Offshore Fishing Port under the Influence of Typhoons

Short-term prediction of wave height based on a deep learning autoregressive integrated moving average model

Based on a 3-D Finite Volume Coastal Ocean Model (FVCOM), tidal dynamics has been studied in the sea area around the Phase III Project of Maji Mountain Port (MMP). Furthermore, taking typhoon “Canhong” as an example, a storm surge and sediment model has also been established to study the impact of the Phase III Project on current flows and siltation during extreme weather. Tidal currents before and after the project have been compared. Model results show that the changes of tidal current mainly occur in the engineering areas with a magnitude change of 0.3–0.4 m/s during maximum flood and ebb tides. The flow condition for the port has been improved as the flow direction is changed to parallel to the wharf after the completion of the project. There is little siltation in the adjacent area, which will not affect the safety of ship navigation. Besides, the sudden siltation during typhoon period is relatively weak. The back silting in two days is less than 5 cm indicating no sudden siltation occurs.

Zhizu Wang

Papers

Impact of Phase III Project of Maji Mountain Port on sediment siltation in adjacent sea area