Reclamation and aquaculture activities have brought potential harm to the hydrodynamics and aquatic environment of the estuarine coast.Therefore,the gradual implementation of the restoration from aquaculture to tidal flats projects in reclaimed areas has begun to repair the hydrodynamic environment of the estuary.However,there is currently a lack of comprehensive evaluation and research on the hydrodynamic changes caused by restoration from aquaculture to tidal flat projects.Taking the restoration from aquaculture to tidal flats project in the Luanhe Estuary as the background,this study constructed a two-dimensional hydrodynamic numerical model to investigate the influence of the restoration project on the runoff-tide interaction of the Luanhe Estuary from the aspects of hydrodynamic field,tidal prism capacity,and flood discharge capacity.The results show that the area of the restoration from aquaculture to tidal flats project is about 300 hm2,and the widening of the estuary cross-section has led to changes in the hydrodynamic conditions within the estuary.The river flow dynamics are significantly weakened,with the maximum reduction of the downstream flow velocity during the flood season reaching about 61.82%;the tidal current dynamics are significantly strengthened,with the upstream tidal flow velocity increasing by 0.25 m/s during the dry season,and the balance position of river-tide interaction moving upstream.The tidal prism capacity of the estuary is significantly enhanced,with the duration of the flood tide during the dry season large tide extended by 12.5%,and the tidal prism flux during the flood tide period increased by 219.8%.The flood discharge capacity of the estuary is significantly improved,with the maximum water surface drop during the flood season in the river channel reduced by 45.8%,the hydraulic gradient gradually reduced,and the main driving axis flow velocity significantly reduced.The restoration from aquaculture to tidal flats project is beneficial to the flood control,tide resistance,and ecological environment improvement of the estuary,and it is suggested to further increase the implementation efforts.
关键词
滦河口/退养还滩/水动力场/纳潮量/行洪能力
Key words
the Luanhe Estuary/restoration from aquaculture to tide flats/hydrodynamic field/tidal prism/flood discharge capability
维普
万方数据