Laboratory Study On Ground Water Change During Artificial Recharge

Groundwater is a valuable natural resource, particularly in the city ofDaqing surface water-poor city, Groundwater resources appears to beparticularly important. However, with the increase of exploitation ofgroundwater resources,groungdwater still is in the state of orveexploitation.To rationally exploit underground water resources ,to achievesustainable use of water resources, Daqing city government decided toartificial recharge groundwater, Construction of underground reservoir. Thequiddity of artificial groundwater recharge is injecting surface water intounderground aquifers by using certain engineering measures, to increasequantity of groundwater recharge, regulate and control groundwater.Although artificial groundwater recharge groundwater can be used toincrease the volume of Daqing City and provide a reliable water supply tothis city, However, artificial recharge of groundwater quality will have adefinite impact to groundwater. As such,this paper research the influenceduring groundwater artificial recharge by using laboratory experiment(thestudy divide this into comparison experiment and balance experiment).this paper mainly research the influence of different permeability media,different supply source of water and aquifer mineral composition togroundwater quality during groundwater artificial recharge. As the same timethe paper use inverse hydrogeochemical model to research"water—rock"action . The study results are as follows:(1)The influence of different permeability media to groundwaterqualityFrom the groundwater conductivity, pH, chloride concentration, sulfateion concentration, calcium ion concentration and the concentration ofmagnesium ions six aspects ,this paper research the influence of differentpermeability media to groundwater quality.By research the dates ofcomparison experiment,we know that the influence of fine sand,grit ang original sand to groundwater do not exist obvious difference. It is noteworthythat the experimental selected sand samples just are different physicalproperties, If sand sample are kinds of different mineral composition mayhave different influence to groundwater.(2)The influence of different supply source to groundwater qualityBy comparing the influence of different supply sources (South Lakewater and tap water) to groundwater during artificial recharge, we can seethat the different quality water supply source after artificial rechargegroundwater,the difference was very much reflected. In other words, thesource of water supply to groundwater quality will be greatly affected.Ifsome composition concentration in injection water is high, the samencomposition concentration in groundwater also will bi high in the samenrecharge conditions, the contrary is low. It is also stated that when weplanned artificial recharge groundwater, the source of supply must choosecarefully. as a result of artificial groundwater recharge and pollution willcause irreparable losses.(3)The influence of aquifer mineral composition to groundwaterqualityBy researching the dates of balance experiment,we can see that thegroundwater chemical composition compared to the previous chemicalcomposition has undergone an obvious change after injection water settled inaquifer 3 months.Some mineral composition of aquifer dissolved into thewater,and some chemical components in the water increased; Some mineraldeposit and some chemical components lower. Therefore, during artificialgroundwater recharge,we need to consider not only the source of watersupply , but also the mineral composition of aquifer.Only by dong this,wecan realize this question mone accurate.(4)Mechanism AnalysisBy using inverse hydrogeochemical model,the main mechanisms thataffect groundwater quality include mixed mechanism,lixiviation and cationexchange adsorption. Different role in the process of artificial recharge ofgroundwater has played the role of the size vary.In the stage of surface waterinject into aquifer, mixed mechanism play a major role. When the water andgroundwater recharge mixed stability,lixiviation gradually play a major role.As for the cation exchange adsorption it has been throughout the wholeexperimental process. By simulating the five model was informed that theaquifer of anorthite in lixiviation played in the most obvious.(5)The guide to Daqing supply source water quality ○1 Artificial recharge process leading to the underground water qualitychanges, mainly as a result of injection of water quality, ground water quality,aquifer mineral phase, Redox conditions affected. Water quality verification(or choice), you can inject water under water and underground water after aninitial choice of contrast, Further proof should also consider water-rockinteraction and other factors.○2 From the bubbling waters genius of the chemical composition ofwater is superior to the West groundwater chemical composition of thepreliminary analysis genius of the bubbling waters used for irrigation waterto the West feasibility of a larger...