Investigation Of Migration And Change Of Salinity In Groundwater In Beijing Area

The object of study for salt in the groundwater in the Beijing area, on the basis of the data collection, field investigation, sample collection and test analysis, with regional geological and hydrogeological characteristics of study area, analysising and research area groundwater salinity distribution characteristics, formationing the statistics of influence factors of salt and analysising the correlation,then by using the Visual MODFLOW software underground water quantity, water quality model is established, calibrationing of groundwater flow and solute transport model, simulating groundwater pollutant migration, understanding salt in the groundwater migration change rule.Through the analysis of influence factors and simulation prediction come to a conclusion: precipitation, temperature, pH, underground water level and reciprocal transformation between components are factors that result in the change of salt migration; Using the 3D migration model of salt, simulation projections for the study area found that over time,pollution area surrounding groundwater TDS increases year by year, high TDS of groundwater distribution area expands year by year; with the increase of pumping water, salt in the groundwater pollution area first increases then decreases;base on the model research analysis of the causes of deterioration of groundwater, the main reasons are that human emissions of pollutants and excessive exploitation of groundwater.According to the results of salt migration change mechanism and model prediction, for the region groundwater salt pollution prevention and control to provide certain theoretical basis.