The Numerical Simulation Study Of Groundwater Environment Impact On Gaohe Power Plant

Shanxi as China’s coal province is rich in coal resources, and also is the largest province of the electricity, the energy structure determines the power plant fuel is coal-based, electric power industry become the shanxi coal industry, the proportion of thermal power is higher than the national power industry in shanxi in the70%to80%. With power plant operation, the site area of the coal and the coal conveying system flushing wastewater, domestic sewage, industrial wastewater, fuel library flushing wastewater under abnormal conditions may occur leakage damage to the Phreatic aquifer.In addition, Ash storage field under the influence of rainfall leaching lead to some chemical components dissolve in the grey water, As the grey water infiltration in phreatic aquifer, vadose zone and groundwater in the phreatic aquifer of the ash pose a threat. Understand the migration process of pollutants and scope, to adopt reliable, economic and reasonable groundwater pollution prevention and control measures to provide theoretical support.Taking GaoHe power plant as the research background, investigate and analyze the Geological and hydrogeological conditions of GuCun site zone and south slope gully grey area, Through the determination of soil water characteristic curve and water penetration test, Take out of the two sites of vadose zone soil hydraulic parameters and vertical permeability coefficient; Through the pumping test of the two field phreatic aquifer hydrogeological parameters. On this basis established the vadose zone of the hydrogeological conceptual model, unsaturated zone moisture migration model and the solute transport model and hydrus-ld vertical one-dimensional flow numerical model, respectively predict the GuCun site coal and the coal conveying system flushing wastewater, domestic sewage, industrial wastewater, oil flushing wastewater accident situation and southern slope rainfall leaching solution infiltration ditch ash field migration characteristics of cases in the vadose zone; Then when pollutants in phreatic aquifer, the phreatic aquifer hydrogeological concept model is established, and groundwater flow and solute transport model and visual modflow horizontal2d flow numerical model, and numerical model for groundwater flow field of a model recognition and examination, respectively predict the pollutant migration law in phreatic aquifer.Vertical one-dimensional flow through the hydrus-ld numerical simulation calculation, get the vadose soil pollutant concentration change with time and depth of the profile curve, summed up the migration regularity of contaminants in the vadose zone, the depth of the section of each soil pollutants concentration with time increasing, the soil adsorption of pollutants reach saturation state, concentration will no longer increase.Through visual mudflow horizontal2d flow numerical simulation calculation, get the pollutants into phreatic aquifer,1year,10years,30years of the pollution halo range migration and concentration changes, summarizes GuCun site in phreatic aquifer of pollutants concentration leakage points, the highest pollution halo over time toward upstream and dispersion on both sides, downstream along the flow direction of migration, influence area is increasing. South slope gully ash field rainfall leaching solution after entering phreatic aquifer because of the limitation of gully topography of grizzly phreatic aquifer contaminants concentration is highest, within the scope of the upstream and bilateral diffuse very few, mainly along the valleys to the downstream migration and increases with time increasing the impact on the downstream-area.