摘要
基于策勒绿洲78个取样点的地下水的观测资料,结合地理信息系统,运用地统计学方法和Sigmaplot10.0中的Piper模块,研究塔里木盆地南缘策勒绿洲区地下水TDS(Total Dissolved Solids)的时空变异,揭示地下水水化学特征及其演变的主要水化学过程。结果表明:①地下水TDS存在强烈的空间相关性,其空间相关距离为4.4km,在步长为6 km范围之内,地下水TDS的空间变异是各向同性的,当步长大于6 km时,4个方向上的半变异函数发生了不同的变化;②绿洲南部区域为地下水TDS的低值区,最小值为551 mg.L-1,由南向北地下水TDS呈增加的趋势,在北部地下水埋深低值区的TDS最大值为7 192 mg.L-1;从地下水水流方向上看,即从绿洲西南的低值区向北,再转向东北区方向,地下水TDS逐渐增加,最大值为3 677 mg.L-1;③浅层地下水化学类型变化复杂,主要从Na-Ca—SO4-Cl-HCO3、Na-Ca—SO4-Cl型向Na—SO4-Cl-HCO3和Na—SO4-Cl型演化。
Based on the groundwater observation data of the 78 sampling points in Cele oasis of the southern Tarim Basin, the spatial variability of groundwater TDS （Total Dissolved Solids）, water chemical characteristics and the main evolution chemical process were analyzed with GIS, geostatistic method and Piper module of Sigmaplotl0.0 software. The results indicated that： （1） Groundwater TDS was obviously space-related, and its space-related distance was 4.4 km. Anisotropic analysis showed the spatial variability of groundwater TDS was isotropic in the range of 6 km, while the spatial variability was anisotropic when the distance was beyond 6 km. （2） The result of Kriging interpolation indicated the groundwater TDS increased from south to north （from 551 mg·L^-1 to 7 192 mg·L^-1 ） ; Along groundwater flow direction, the groundwater TDS increased from southwestern to the northeast oasis. （3） The water chemistry types of shallow groundwater were spatially complex, which changed from Na-Ca-SO4-Cl-HCO3 and Na-Ca-SO4-Cl to Na-SO4-Cl-HCO3 and Na-S04-Cl.
出处
《中国沙漠》
CSCD
北大核心
2010年第3期722-729,共8页
Journal of Desert Research
基金
自治区科技攻关和重点科技项目"塔里木盆地南缘和田绿洲外围生态建设关键技术开发与示范"(200633130)
国家重点基础研究发展计划项目(2009CB421302)
林业科技支撑计划子专题(2006BAD26B0202-1)联合资助
