Study On The Influence Of Suspended Matter Produced By Water Transport Engineering On Offshore Ecosystem

With China's port construction entering a new stage,the port has developed from the extensive development in the past to the quality and environment friendly direction.The construction of waterway engineering is a necessary activity in port engineering construction,and is a prominent stage of environmental pollution in the process of port construction and operation.The construction process of water transportation,such as foundation treatment,dredging and backfilling,will disturb the bottom quality of the seabed,produce a large amount of suspended matter,and spread to the surrounding sea area with the tide,wave and so on,destroy the survival,growth and habitat of aquatic organisms,and influence the ecosystem in the surrounding sea area.It is helpful to take reasonable measures in the construction and construction process of port construction to reduce the damage of the water transport engineering construction to the coastal waters ecosystem.In this paper,a complex network analysis method based on ecological association is proposed,which provides a technical support for quantitative evaluation of the loss of biological components,the self repair time of the ecosystem and the reasonable arrangement of the construction strength by the construction of suspended matter.Firstly,this paper analyzes and summarizes the principle of the suspended matter in the construction of the water transport engineering and the calculation method of the strength of the suspended matter source in the water transport construction.The hydrodynamic diffusion control equation and the two-dimensional mathematical model of the sediment diffusion are used to simulate the diffusion and distribution of the suspended matter in the offshore water.Secondly,a calculation model of the influence of suspended matter concentration on aquatic organisms is established based on two populations.The classification of marine organisms and the related experimental results of the influence of suspended solids on the different marine organisms were carried out.The theoretical equation of suspended biomass concentration and biological loss is constructed,and the influence of the loss of single species on the trophic level is introduced by introducing the predation parameter.Thirdly,a biological network analysis model based on ecological correlation is introduced,and the research methods and steps of the impact of suspended solids on the biological network are put forward.A model was built to evaluate the relationship between biomass and factors in aquatic ecosystem.The disturbance of the suspended substance to the ecosystem is analyzed,and the influence of suspended matter on the ecosystem in time is analyzed.Lastly,taking the blasting and silting construction in a port as an example,it simulates the occurrence of suspended matter and its diffusion under different blasting and silting construction frequency,studies the spatial distribution of the loss of young fish based on two species,establishes an ecosystem network of the construction sea area and analyzes its network characteristics,and studies the evolution of the biological network of the ecosystem.The biological loss and ecological restoration time under two construction scenarios are compared.This study provides a quantitative calculation method for the loss of aquatic organisms and self-recovery time in water transport construction,which provides a theoretical basis for assessing the impact of suspended matter on the ecosystem in water transport construction,and has a certain reference significance for the construction of ecological port.