民勤县绿洲地下水矿化度变化特征

Change Characteristics of Groundwater Mineralization in Minqin Oasis

基于民勤绿洲72眼观测机井1998~2013年的地下水矿化度数据,采取方差分析和趋势性检验的方法研究了民勤绿洲地下水矿化度的变化特征。研究结果表明:在时间序列上,地下水矿化度整体表现为先增加后降低的趋势,但湖区地下水矿化度在秋季持续增加;在空间上,地下水矿化度为湖区>泉山区>昌宁区>坝区>环河区。治理前或治理后,湖区和环河区与其余各区相比,地下水矿化度差异显著(P<0.05);治理前后,湖区在秋季和全年地下水矿化度差异显著(P<0.05),治理后各区地下水矿化度的变异系数均明显增大。湖区地下水矿化度年际变幅在秋季呈增加趋势,其余各区地下水矿化度年际变幅均呈下降趋势。此结果说明了目前采取的工程治理措施可有效缓解该区域地下水矿化度增加幅度。

In this paper,the data of groundwater mineralization in 72wells from 1998to 2013were used to analyze the tem-poral and spatial changes in Minqin county by the analysis of variance,and trend test.The results were as bellow:in terms of time series,the overall groundwater mineralization showed a trend of increasing first and then decreasing,but the ground-water mineralization in the lake area continued to increase in autumn;spatially,the groundwater mineralization was lake area>Quanshan area>Changning area>Ba area>Huanhe area.Before or after government,the lake area and the Huanhe ar-ea have significant differences in groundwater mineralization compared with the other areas(P<0.05);before and after gov-ernment,the lake area had significant differences in autumn and year-round groundwater mineralization(P<0.05).The variation coefficient of groundwater mineralization was markedly increased after government.The increasing range of groundwater mineralization was continuing to rise in Huanhe area at autumn,while it was declining in the rest of studyareas at spring,autumn and all year round.The paper proved that that the current engineering treatment measures can effectively-alleviate the increasing range of groundwater mineralization.