Effects of Ecological Restoration Project on Hydrodynamics at Shanhaiguan Tourism Beach

Abstract:

To improve the coastal environment, an ecological restoration project for tourism beach was developed between Bailu Island and Tangzizhai in Shanhaiguan. A threelayer gridnested model, covering the waters of Bohai Sea, Qinhuangdao, and Shanhaiguan, is established based on Delft3D and validated by field measurement. Then, the model is used to investigate the influence of the engineering project on the hydrodynamic characteristics. The results indicate that since the tidal current field remains basically unchanged, the water exchange capacity is kept and there is no negative effects on the ecology. Offshore submerged breakwaters dissipate wave energy with a degree of reducing 10% normal wave and 20% storm wave in height. In a word, the ecological restoration project of Shanhaiguan tourism beach not only maintains the hydrodynamic environment, but also weakens the beach erosion, which is conducive to maintaining the ecological environment and stability of local tourist beaches.

Key words:beach ecological restoration; offshore submerged breakwaters; wavecurrent coupling; numerical simulation