Study On Impact Of Shoreline Changes In Tianjin Coastal Waters On The Marine Environmental Capacity

Tianjin coastal waters is a high degree of development and utilization of the region, especially in recent decades, marine reclamation land is increasing in the Tianjin coastal, it changes the tide motion characteristics of the regional, giving rise to the pollutants migration rule changes, reducing the diffusion of pollutants and water environmental capacity. Meanwhile, with the rapid development of industrialization, urbanization and economic in the Tianjin Binhai new area, a large number of domestic sewage and industrial wastewater are discharge into the coastal waters. Shoreline changes and a large number of sewage discharge make pollutants accumulation in the coastal, causing the Tianjin coastal waters pollution is more and more serious.The article makes a quantitative study on that the impact of the shoreline changes of Tianjin coastal waters on hydrodynamic,pollutant transport and the marine environmental capacity. By collecting information, understand the shoreline changes of Tianjin coastal waters in recent years. Learned that the reclamation activity of Tianjin coastal waters are mainly concentrate in 2006 ~ 2009 period. The single factor pollution index method is adopted for water quality evaluation of Tianjin coastal waters, the results show that Tianjin coastal waters is seriously pollution, and the reclamation engineering construction will inevitably lead to the coastal waters environment quality further deterioration, therefore, the article regards 2006~2009 as the research period. According to the evaluation results, this article selects the COD, DIN, DIP as the environmental capacity of indicators. Application MIKE21 hydrodynamic model simulate the tidal field under the different bank shape conditions of Tianjin coastal waters, and analyses the shoreline changes affect on the hydrodynamic condition. It also counts the quantities of main contaminants that discharged to the Tianjin coastal waters, to simulate the influence degree of the pollutant for each period by using MIKE21 contaminant transport diffusion model. With the concepts of sharing rate method, it calculates the marine environmental capacity of main pollutants. On the basis of pollutants discharge station in 2005, it can allow us to study the environmental capacities consequences of shoreline changes. According to the results of this study analyses the pollution causes of Tianjin coastal waters. This can provide fundamental basis for environmental protection and the resource sustainable utilization of Tianjin coastal waters.