However, due to the influence of external pollution and hydrodynamic environmental conditions, the distribution characteristics of pollutants in different regions are different, and the vertical horizon of the pollution layer is different. Under natural conditions, the pollutants in the bottom sediment are mainly concentrated in the sediment layer with a thickness of 20~50cm on the surface layer. The spatial difference in sediment pollution determines the layout of dredging. Rational analysis, deep reflection, and comprehensive understanding of the impact of dredging are of great significance to the revision or promulgation of dredging regulations for sediment removal.ġ.1 Full section removal, surface removal and seed bank retention of sediment In dredging construction practice, some ecological and environmental problems are increasingly prominent. Environmental dredging and ecological conservation paradox And combined with the new ecological dredging method of terrain model is put forward for the subsequent ecological restoration build appropriate depth and basal conditions are needed to provide the solution. Based on the focus on environmental protection dredging sediment pollutant removal currently, water ecological restoration after the dredging reconstruction are concerned about the problem of not enough analysis filter control factor affecting aquatic ecosystem survival, growth. Study on ecological environmental protection dredging optimal control factor, water ecological restoration and protection of aquatic is conducive to the follow-up research, it is extremely necessary and urgent. But the majority of the planning and implementation of the environmental protection dredging process, the starting point for the sediment pollutant removal and control of pollutants in the process of dredging relief, rarely considers the ecological problems caused by dredging and ecological protection.
The biggest difference between polluted sediment dredging and ordinary engineering dredging is that the former is integrated with the environmental protection concept and requirements, aiming at the removal of pollutants from the sediment and the change and improvement of water environment indicators.
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