石羊河治理工程对下游地区地下水及其矿化度的影响

Impacts of disposal projects on the groundwater level and degree of mineralization in the lower reaches of Shiyang River

以民勤2001-2014年52眼观测井连续观测的地下水埋深、地下水矿化度数据为基础,分析地下水埋深及其矿化度的时空变化规律,与已采取的治理工程措施做了相关性分析.结果表明:空间上地下水埋深以泉山区最大,南湖区最小;地下水矿化度排序表现为湖区>泉山区>坝区>南湖区;时间序列上,地下水埋深先增加(2001-2009年)后维持平稳并有减小的趋势(2010-2014年),地下水月变化特征整体呈V字型;地下水矿化度先变大(2001-2012年)后减小(2012-2014年),湖区和南湖区的地下水矿化度秋季大于春季,泉山区和坝区的春季大于秋季;地下水埋深及其矿化度与采取的治理工程具有显著相关性.

The data of groundwater level and degree of mineralization in 52 wells from 2001 to 2014 were used to analyze their temporal and spatial changes in Minqin, and correlation analysis was made of the groundwater level, degree of mineralization and disposal projects. The results showed that in space, the maximum and minimum groundwater level was in Qushan and Nanhu regions and the degree of mineral- ization was like： Hu （lake） region〉Quanshan region〉Ba region〉Nanhu region. In time series, the ground- water level increased （2001-2009） firstly and then maintained at a smooth state, at the same time hav- ing a tendency to reduce （2001-2009）. The monthly variations of groundwater level was in ＂V＂, the de- gree of mineralization was increasing （2001-2012） and then reducing （2012-2014）, it was bigger in au- tumn than spring in the Hu and Nanhu regions, while it was bigger in spring than autumn in Quanshan and Ba regions. The correlation analysis showed that the groundwater level, degree of mineralization of groundwater and disposal projects had a remarkable correlation between them.