基于地统计的新疆阜康绿洲地下水埋深空间异质性

Analysis of spatial heterogeneity of groundwater depth in the Fukang oasis of Xinjiang based on the geostatistics

基于新疆阜康市1993—2015年地下水位埋深的实地观测数据,采用地统计学方法,利用SPSS、GS+和Arc GIS软件,对阜康市绿洲区地下水埋深进行半变异函数分析和Kriging空间插值分析。结果表明:(1)阜康市绿洲区地下水埋深具有很强的空间相关性,地下水位的变化主要是由结构因素引起的,受随机因素影响较小;(2)阜康市绿洲地下水埋深呈现为从西北向东南逐渐加深的趋势,并且1993—2015年地下水埋深呈现为普遍下降的趋势,其中地下水埋深小于8 m的区域缩减的最为明显,主要集中于人类活动的绿洲地带,因此,人类活动对地下水埋深的影响强烈。

Based on the observed data of groundwater depth of Fukang,Xinjiang,from 1993 to2015,the semivariogram analysis and Kringing Spatial Interpolation Analysis based on the geostatistics were carried out to examine groundwater depth,using SPSS,GS＋ and Arc GIS. The results showed that the groundwater depth of oasis in Fukang had a strong spatial correlation. The changes of groundwater level were mainly caused by structural factors,but were less influenced by random factors. The depth of groundwater gradually deepened from northwest to southeast. The groundwater depth presented a temporal decline in 1993-2015,with an obvious reduction occurring in areas with groundwater level less than 8 m,which mainly concentrated in the oasis being influenced by human activities. Therefore,the human activities have strong impacts on the depth of groundwater in this area.