Study Of Groundwater Hydrochemical Characteristics And Vulnerability In Tongliao Area

Horqin district is the most important city in northeast of west Liaoriver.Horqin district in Tongliao is an agriculture based, industry led,industry, agriculture, forestry and animal husbandry are common developedregion.The precipitation in the area is small, evaporation is strong, surfacewater resources are abundant.But in recent years, because of the arid climateand the construction of the reservoir in the upper reaches of the river, theflow of river is reduced year by year, the volume of surface water and availablecapacity are also reduced.Groundwater is the main water source in this areafor production and life.However, with the development of local economic,groundwater quality in the study area has also undergone somechanges.Groundwater, salinity, chlorine, fluorine, arsenic, lead, mercuryand others have varying degrees of overweight, have varying degrees ofgroundwater salinization phenomenon.So, it’s meaningful to study thegroundwater in the area of chemical characteristics, evaluation ofgroundwater quality, groundwater pollution prevention, strengthen researchgroundwater vulnerability, protection of groundwater resources.This paper is based on CGS’s project 《Groundwater Pollution’sinvestigation and assessment of West Liaohe River Plain》, and it’s targetis to protect groundwater resources in the areas, the shallow groundwateris the research object. This paper use of data collection, pollution sourceinvestigation, sample collection and theoretical analysis methods to evaluateof the hydrochemical characteristics of groundwater and the antifoulingperformance development system.According to the76groups of groundwater samples test data, acquire thestatistical characteristics between the main ionic contrast in groundwater.The mathematical and statistic feature shows its value is higher in differentareas of concentration, and easy to be affected by aquifer media, topography,hydrology meteorological conditions and human activities and otherfactors.Groundwater inorganic components exceed the standard statistics, exceed the standard rate of iron and manganese were highest, more than75%,nitrite, Pb, Al, exceed the standard rate is between10-20%, the remainingcomponents exceed the standard rate is low.According to the collected data，excessive iron, manganese, fluoride is mainly affected by natural conditionsand a higher native environmental background values,excessive three nitrogenmainly because of human activities and industrial and agriculturalproduction.According to corrective analysis, the TDS and Cl-, Na+, Mg2+,SO42-’s correlation above0.83, indicating that changes in TDS and trends ofthese types of ion concentration are almost the same.Analysis by ioncoefficient ratio, indicating that as the TDS’s concentration, not onlybetween the groundwater and aquifer media dissolve precipitated halite,gypsum and dolomite, alternating cation accompanied happen.Based on "Groundwater Quality Standards"(GB/T14848-93), shallowgroundwater environmental quality assessment using notes plus score.The results show that excessive Fe, Mn, total hardness, PO43-, NO2,etc.-component is the most important factor affecting groundwater quality inthe study area; The high quality shallow groundwater mainly distributed inthe northeast Horqin district ’ Yinigatu-Yang wells-ten breakout rooms, andVictory Village-Ma Wo warburg area;Poor quality shallow groundwater areasare distributed in four patches, west town in the northwest of Tongliao citycenter,Dongxiboyingzi in the Northern District of study area-Second Road CampVillage-West Jiamusi Village-East million tree Village, Anju Village-a small Anju Xillage-Xinglong Village-Pan chomchon, and southeast of thestudy area along the eastern Sahara dry spit.Poor quality shallow groundwaterareas are not including two above-mentioned areas of regions, this area isdistricted widely, covering the city of Tongliao city center, as well as almostall of the town center. Fe, Mn and other indicators are impacted by the nativeenvironmental, PO43-, NO2-is caused due to pollution caused by human activity.Reference Model index selection and grading standards, combined withgeological studies, such as hydrogeology, land use characteristics, selectthe seven factors that affect groundwater vulnerability as an evaluation index:groundwater depth, net recharge, soil lithology, aquifer lithology,land use type, lithology, permeability coefficient On the basis of DRASTICmodel, topographic effects removed, add new use type land,modify the new modelDRASLIC.Mapgis software will be used to analysis the evaluation index factorlayer spatial overlay. The weight value and the value of the evaluation factors,calculated by the model, the results of the study area groundwater antifoulingpartition and analyze the causes. For the decision-making of development andutilization of groundwater in the study area provided the basis。...