Analysis Of The Characteristics Of The Under-transport And Spatial Evolution Of The Pollution Texture Of Dawu Water Source

Groundwater resources have important strategic significance for the development of the northern region of my country.Dawu water source is the main water source for Zibo City in Shandong Province and plays an important role in promoting the sustainable development of Zibo City’s economy.Due to the distribution of many chemical companies in the area,multiple polluted areas have been formed.With the further development of the economy,the problem of groundwater pollution is becoming increasingly prominent,and related research on groundwater pollution needs to be carried out as soon as possible.In this paper,based on the study of typical pollutants,numerical simulation of groundwater was conducted by GMS,and the characteristics of typical pollutants transported in groundwater were qualitatively and quantitatively studied,and corresponding results were obtained.The main research contents and results of this article are as follows(1)Determine the typical pollution quality and typical pollution area.Based on the water quality data,using the mathematical method of pollution classification index evaluation,the typical inorganic pollutants are chloride,ammonia nitrogen and sulfate,and the typical organic pollutants are petroleum,benzene and trichloroethylene Chloride and ammonia nitrogen are used as inorganic pollutants,petroleum and benzene are used as organic pollutants.Using geostatistics to trace the source,the typical polluted area is determined as Hougao.(2)Based on the borehole data,the groundwater numerical model of Dawu water source area was established using GMS.The solid model reveals that the lithology from top to bottom is Quaternary clay,local Cretaceous diorite,local Carboniferous shale and Ordovician limestone.Converted from the solid model to the groundwater flow numerical model.After the model verification and generalization of the initial concentration of polluted pollution,the MT3DMS module established a numerical model of typical pollutant transport(3)Under normal seepage conditions,the four typical pollutants migrate from ellipse to Xixia in the oval shape,and the farthest migration place is Xixiazhuang;the pollutants are affected by hydrodynamics from discontinuous points to continuous planes Transport.In the horizontal migration,the impact range of organic pollutants polluted by the limit value of Class Ⅲ water standard is wider than that of inorganic pollutants.In terms of vertical migration,organic substances such as petroleum and benzene are difficult to dissolve in water,so they easily migrate with the groundwater as molecular clusters,and are easily adsorbed by the soil to form high-pollution areas that exceed Class Ⅲ water standards.Organic pollution is more serious(4)Set up anti-pollution measures with only pumping wells,only anti-seepage walls,and the combination of the two to carry out calculation of the transport of pollutants in groundwater.The results show that the three measures have reduced the impact range and diffusion distance of pollutants in groundwater migration.The longest migration distance and the pollution range that exceeds the category Ⅲ water standard are the control effects of the joint action of pumping wells and anti-seepage walls.The best;to the extent that the normal seepage situation exceeds the scope of category Ⅲwater pollution,the three groundwater pollution control measures are better at blocking inorganic substances than organic substances.The blocking effect of "pumping well+anti-seepage wall" is not the superposition of the blocking effect of separate pumping well and separate anti-seepage wall.The groundwater pollution control measures are non-linear to the pollutant blocking effect.