Abstract
Integrated renovation projects are important for marine ecological environment protection. Three-dimensional hydrodynamics and water quality models are developed for the Maowei Sea to assess the hydrodynamic environment base on the MIKE3 software with high resolution meshes. The results showed that the flow velocity changed minimally after the project, decreasing by approximately 0.12 m/s in the east of the Maowei Sea area and increasing by approximately 0.01 m/s in the northeast of the Shajing Port. The decrease in tidal prism (~ 2.66 × 106 m3) was attributed to land reclamation, and accounted for just 0.86% of the pre-project level. The water exchange half-life increased by approximately 1 day, implying a slightly reduced water exchange capacity. Siltation occurred mainly in the reclamation and dredging areas, amounting to back-silting of approximately 2 cm/year. Reclamation project is the main factor causing the decrease of tidal volume and weakening the hydrodynamics in Maowei Sea. Adaptive management is necessary for such a comprehensive regulation project. According to the result, we suggest that reclamation works should strictly prohibit and dredging schemes should optimize in the subsequent regulation works.
Highlights
Integrated renovation projects are important for marine ecological environment protection
Due to the vulnerability of ecological environment and the rapid growth of human activities, the hydrodynamic environment of the bay has undergone a series of changes, and the Marine resources and ecological environment have been damaged to different degrees[1], which seriously affect the sustainable development of the Marine environment[2,3]
Three-dimensional hydrodynamics and water quality models are developed for the Maowei Sea to assess the hydrodynamic environment base on the MIKE3 software with high resolution meshes
Summary
Integrated renovation projects are important for marine ecological environment protection. Because of rapid industrialization, increasing population, and excessive mariculture in recent years, the Maowei Sea area experienced mounting environmental challenges such as a shrinking area, weakened hydrodynamics, eutrophication, and heavy metal p ollution[7,8] These problems threatened the sustainable development of common activities such as fisheries. The dredged soils served in the construction of an area covering 4.42 k m2, producing an extension of the shoreline by approximately 4.2 km (Fig. 1) These projects focused on improving the water quality of the Maowei Sea, preserving its unique ecological and species diversity, building a livable and commercial bay city, and enhancing the value of the marine resources[9]. Some indicators have been utilized in hydrodynamic environmental impact
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