塔里木河下游地下水位与水化学成分关联度排序分析

根据2001年塔里木河下游第四次生态输水前后地下水位、水质变化的监测和取样分析资料。运用灰色关联分析法。对塔里木河下游地表生态输水前、后的地下水位与地下水化学成分进行了关联分析。分析研究表明,生态输水对地下水质的影响比较明显。在关联排序中。阴离子的SO4^2-、Cl^-以及阳离子的Ca^2 、Mg^2 与地下水位变化的关联性较强;pH值与地下水位的关联度最低。仅为0．534;矿化度与地下水位关联度最高,达到0．863。

Compositor Analysis on Correlation between Groundwater Level and Water Chemical Contents in Lower Reaches of Tarim River

According to monitoring and sample analysis of groundwater level and salinity change at lower reaches of Tarim River, this paper made a correlative analysis on chemical elements of groundwater and groundwater level before and after surface ecological water transportation. The correlation sequence of groundwater chemical elements and groundwater level change was SO 4 2- > Cl -> Na +> HCO 3- > K +> Ca 2+ > Mg 2+ before water transportation, and that of groundwater chemical elements and groundwater level changed into Cl -> SO 4 2- > Na +> Mg 2+ > Ca 2+ > K + > HCO 3. After water transportation, SO 4 2- was at the first in the sequence of correlation before water transportation and fell to the second after water transportation. the position of in the sequence changed from the second before water transportation to the first after water transportation. The order of Mg 2+ and Ca 2+ 's order in the sequence of correlation also had many changes after water transportation, Mg 2+ changed from the seventh to the fourth and Ca 2+ changes from the sixth to the fifth after water transportation. The result showed that ecological water transportation had obvious influence to the quality of groundwater. The concentration change of SO 4 2- ,Cl -, Ca 2+ and Mg 2+ had high correlation with change of groundwater level. However, the correlation between pH value and groundwater level was lowest, which indicated that the water transportation had little influence to the change of pH value of groundwater. Correlation between groundwater salinity and groundwater level was highest with correlation value of 0.863 after water transportation, which indicated that the water transportation had much influence to the change of groundwater salinity.