Research On Evolution Of Groundwater Chemical Characteristics Of Ledu Basin In The Eastern Qinhai Province

Ledu county is a key development county in the eastern of Qinghai province.Beautiful scenery is the gold and silver mine,A good ecological environment is the most favorable livelihood,It is necessary to study the water resources in the construction of ecological environment,So the paper make research on ion distribution,groundwater quality evaluation,hydrogeochemical performance on the typical path,hydrogeochemical reverse simulation based on geological and hydrogeological conditions of Ledu basin.The paper based on 1:50000 hydro-engineering ring geological survey evaluation project in the key areas of the eastern urban agglomeration of qinghai province,which is belong to hydrogeological survey center of China Geological Survey.The results are as follows:Firstly,Carry out a hydrochemical type by drawing a Piper three-line graph,and the water chemical type partition was carried out in the study area by combining the topography conditions.Through using Sufer to draw a equipotential chart about ion and TDS in the area and making analytical investigation about the distribution and change rule in the area to come to a conclution that the ions distribution of Ledu basin presents a certain zonal regularity.The ion distribution trend of Cl^-,SO₄^2-,Mg²⁺,Na⁺,K⁺is consistent,which maximum value are in parts of Shenjiazhuang and Laoecheng,minimum value are widely distributed in the bedrock mountain area.HCO₃ is widely distributed in the study area and its maximum value is distributed in the Huangshui river basin.The general trend of each ion concentration is lower on the northern edge of the basin and higher in the middle of the basin.Secondly,selecte eight typical flow paths,which is based on the existing water chemical analysis data,Then using Ion ratio method to make analysis of the hydrogeochemical process of the eighttypical paths.Then,we can get the solution precipitation about halite,gypsum,feldspar and so on,What's more,We also can get the relationship in runoff and drainage about the ions and it's ratio.Research show that the ions and TDS are both in a low standards in the recharge area,The runoff area as the mineral dissolution ion concentration gradually increased its TDS also gradually increased,This also correspond with the regulership of ion change.Finally we determine the possible mineral phases and constraint condition of the model.Then,we can conduct a water–rock interactionsimilate to thereflect path from a quantitative perspective.At the end,we can get the dissolution and precipitation of feldspar,gypsum,dolomite and ion-exchange adsorption.In the bedrock mountains area mainly feldspar dissolution of minerals,In loess hilly-gully region and valley diving area mainly salt and gypsum dissolution and ion exchange,parts of calcite and dolomite precipitation and precipitation of halite...