沙漠腹地达理雅博依绿洲浅层地下水水化学特征分析

为了评价塔克拉玛干沙漠腹地达理雅博依绿洲地下水水化学特征与演化规律及对当地生态环境的影响。在研究区的生态井位观测点采集了19组地下水样品进行检测。综合运用数理统计、相关性分析、Piper三线图、Gibbs模型、Schoeller图和离子比等方法,分析地下水水化学特征和克里雅河尾闾绿洲的水化学演化规律。研究表明:研究区地下水阳离子以Na⁺、Mg⁺离子为主,阴离子以Cl^-、SO₄^2-,为主,Mg⁺、Cl^-、SO₄^2-表现为强变异性,K⁺、Ca⁺、Na⁺、HCO-3表现为中等变异;TDS介于1000mg/L-18620mg/L范围内,平均值为4366.408mg/L,矿化度较高;水化学类型以Cl^--Na⁺为主;地下水样品主要分布于Gibbs图的右上部分,表明研究区地下水主要受蒸发浓缩作用控制,岩石风化和大气降水影响较小;主要离子比表明碳酸盐、蒸发岩和硅酸盐是离子的主要来源,且处于沙漠腹地的独特地理因素,地下水中的离子交换作用较弱。

Hydrochemical characteristics of shallow groundwater in Dali yaboyi oasis in the hinterland of the desert

In order to evaluate the hydrochemical characteristics and evolution of groundwater in the Daliyaboyi oasis in the hinterland of the Taklimakan desert and its impact on the local ecological environment,19 groups of groundwater samples were collected at the ecological well site observation points in the study area for testing.Mathematical statistics,correlation analysis,Piper three-line diagram,Gibbs model,Schoeller diagram,ion ratio and other methods were comprehensively used to analyze the hydrochemical characteristics of groundwater and the hydrochemical evolution law of the oasis that locates at the end of the Keliya River.The research shows that the groundwater cations in the study area are mainly Na⁺and Mg⁺,the anions are mainly Cl^-and SO₄^2-.Mg⁺,Cl^-and SO₄^2-show strong variability,and K⁺,Ca⁺,Na⁺,and HCO-3 show moderate variation.TDS is in the range of 1000 mg/L-18620 mg/L,with an average value of 4366.408 mg/L,showing high salinity;water chemistry is mainly Cl^--Na⁺.groundwater samples are mainly distributed in the upper right part of the Gibbs diagram,which shows that the groundwater in the study area is mainly controlled by evaporation and concentration,and the impact of rock weathering and atmospheric precipitation is small.The main ion ratio shows that carbonate,evaporite and silicate are the main sources of ions,and because of the unique geographical factors in the desert hinterland,the ion exchange in groundwater is weak.