Hydrogeochemical Process Of Groundwater In The Alluvial Fan Of Mt. Kunlun In Golmud

Golmud is located in the saline lake basin of Qaidam Basin,the surface water and groundwater related to the Golmud River are important guarantee for supporting the social and economic development.Methods including water analysis,ionic ratios,Gibbs figure,reaction path and calculation of hydrogeochemistry were employed to analyze the evolution characteristics of water quality in the upper reaches of the Golmud River,the hydrogeochemistry and main hydrogeochemical process of groundwater in the alluvial fan of Mt.Kunlun in Golmud,and the dissolution kinetic of carbonate and silicate.On this basis,the influence of the saline lake basin on the water quality of river water and groundwater was analyzed.Followings are the findings of this dissertation:?1?With the transforming from the north of the Yuzhu Peak to the south of the Yuzhu Peak,the river valley area of Mt.Shasongwula,and the southern region of Mt.Burhan Budai,the TDS,hydrochemistry type,and the concentration of Na⁺and Cl^-in the river has changed greatly.From the evolution characteristics,the saline lake basin have great influence on the water quality,that is to say,the Yu Zhu Peak suffered the least effect,while the southern region of Mt.Shasongwula suffered the greatest effect.?2?Supplied by the river,the water quality of the groundwater in the alluvial fan was influenced by the runoff and the source of the river.Originated from the Yuzhu Peak,the Golmud River has a large runoff,thus the alluvial fan in Golmud River has a better water quality.The Tuolahai River originated from the north of the Mt.Shasongwula and the Hongliu River originated from the north of the Mt.Burhan Budai are located in the west and east of the Golmud River respectively,which has a smaller runoff and poorer water quality of groundwater in alluvial fan.?3?The main hydrogeochemical process in the study area are the dissolution of carbonate and silicate and the ion exchange.And the dissolution of carbonate is supersaturated.In addition,the dissolution of the halite is obvious in the mineral dissolution.In general,the groundwater quality of the middle of alluvial fan are mainly controlled by the water quality of the river,the hydrogeochemical process of the aquifer minorly.?4?Calculating the dissolution rate of calcite using empirical formula method and inversion method of measured data,the results are 1.09E-07 and 1.05E-07 mmol·cm^-2·s^-1respectively.And the logarithmic averages of rate constants k1?k2?k3?k4 and k are-1.345,-4.726,-6.962,-1.941 and-6.69 respectively.In comparison,the results of the inversion method are more reasonable.?5?Calculating the dissolution rate and the kinetic constant of feldspar mineral,clay mineral and silicon dioxide mineral using inversion method of measured data,the dissolution rate is 3.92E-07?3.14E-07?7.85E-08 mmol·cm^-2·s^-1 respectively,and the kinetic constant is4.52E-04?2.8E-04?2.5E-04 d^-1 respectively,the dissolution rate is obviously higher than that of the carbonate.