Numerical simulation of the transport diffusion of suspended sediment during the construction of artificial island in Taozi Bay of Yantai

摘要

Suspended matter in the sea increases rapidly as a result of the reclamation project during the construction period, which in turn influences the marine ecosystem. Therefore, the study on the transport diffusion of suspended matter in reclamation projects provides an important reference for regional environmental quality assessment and comprehensive ecological impact assessment. This paper takes artificial island reclamation project in Taozi Bay of Yantai as an example, based on the two-dimensional tidal current field mathematical model of engineering waters, the dispersion scope of suspended sediment caused by reclamation overflow during construction of artificial island is predicted by two-dimensional suspended load mathematical model and the accurate simulation of the dispersion of suspended sediment during construction is explored usefully. The results show that the transport and dispersion of suspended sediment produced during construction of artificial island are closely related to the tidal movement and the tide direction and hydrodynamic intensity determine the transport and dispersion direction and range of suspended sediment to a certain degree. During reclamation construction of artificial island, the sediment dispersion during reclamation construction will not affect the Golden Beach as the discharge concentration at the overflow port is low and the envelope range of sediment dispersion is small. Generally, the influence of suspended sediment on the marine environment during construction is just temporary and disappears with the completion of construction, then the suspended sediment will not impose long-term adverse influences on the marine environment.