Research On Evaluation Method Of Eco-environment Vulnerability In Related Area Of Mine Dust Migration

With steady economic growth and continuous social progress,the large-scale exploitation and utilization of mineral resources development has become an inevitable choice.Ecological environmental damage,which includs the declining carrying capacity of ecosystems in associated areas of mineral resources development and gradually increasing of vulnerability,can not be ignored.In the face of the severe situation of environmental pollution and ecological degradation,it is urgent to take scientific protection and governance measures.Aiming at realizing the vulnerability assessment of mining area and its related areas,and revealing the cascade propagation rule of vulnerability between related ecosystems,the following research have been carried out.In order to obtain the regular pattern of concentration distribution in the area associated with mineral dust migration,a mine dust concentration distribution estimating model for single point source were presented,which overcomes the defects of the existing diffusion model which meteorological factors was not amply considered or cannot provides the steady-state concentration value.Based on the migration path data of mine dust,the Gaussian diffusion model,the improved inverse distance weighted data extension method and the Kriging interpolation method were coupling used to analyze the distribution law of the numerical value of the mineral dust on several spatiotemporal dimensions.Taking the Shenfu coalfield as an example,simulate the migration and diffusion during the continuous mine dust discharge process.The dust concentration in three altitudes of each season were calculated and its distribution were analyzed which indicate the dust enrichment area that provides theoretical support for ecological environment assessment of mineral dust migration associated areas.The migration network of mine dust is constructed which identified the potential hazard sources,using the forward and the backward migration path of mine dust from emission sources to the target ecosystem.The definition of Petri-net-based evaluation model of ecosystem damage with cascade propagation(PN-EDCP)is given,and the general method of abstracting the migration path network into Petri net model is expounded.This model,which has a clear reality meaning,possesses the ability to describe and analyze logical relationship of the ecosystem objects and the cascading propagation path of damage in ecosystem,by introducing the concept of attribute and function of place object.The damage degree trend and the related cascade path are discussed in depth based on the simulation analysis results in the case study of Yushen mining area.This model shows the process of mine dust migration endangering the ecosystem intuitively,and provides a reference for forecasting the change trend of the damage degree in mine ecosystem and formulating the corresponding protection and control measures.The definition of the stochastic Petri nets based ecosystem vulnerability cascade propagation(SPN-EVCP)model is proposed and the general construction method of the model is given.Build a network of mine dust migration that consists of multiple migration sources as a starting point for migration pathways and clarify the logical relationship between ecological subsystems.The logical relations are abstracted into SPN-EVCP model,and the auxiliary structures for meeting the traditional SPN characteristics and reserving repair entrances are added to solve the steady-state concentrations of mine dust and simulate the evolution process of ecosystem vulnerability according to the given restoration strategy.The case study shows that this model can intuitively reveal the cascade propagation of ecosystem vulnerability under multi-source pollution and provide a scientific decision-making basis for pollution control and production scheduling.Based on the basic theories of Gaussian plume model,object Petri net,fuzzy Petri net,and stochastic Petri net,this paper integrates HYSPLIT and inverse distance weights interpolation models and methods to construct the vulnerability cascade propagation evaluation model of ecosystems in mining areas and associated areas of dust migration.This model provides a theoretical basis for the assessment of the ecological environment vulnerability of the associated areas of dust migration.