新疆渭干河流域地下水含盐量的时空变异特征

对面积约3408km^2的渭干河流域地下水含盐量进行取样检测，应用地质统计学方法对取得数据进行了半方差函数分析。结果表明，该地区1998、1999年地下水含盐量变异函数曲线的理论模型符合球状模型：1997年、2000年地下水含盐量变异函数曲线的理论模型符合有基台线性模型。通过对1997年、1998年、1999年及2000年水样的分析，得出该地区地下水含盐量在时间与空间上皆存在明显变异性的结论。在空间尺度上，地下水含盐量从研究区的西北向东南方向有增加的趋势。从整体上看，研究区地下水含盐量东部高于西部：南部高于北部：东南部高于西北部。在时间尺度上，研究区东南部地下水随着时间的推移正向盐渍化加重方向发展。本文利用软件Geopack与Surfer7．0软件绘制了地下水含盐量的时空分布图，为该地区地下水盐分的管理与今后的防止盐渍化提供了决策依据。

Study on the Spatio-temporal Variation of Groundwater Salt Content in Xinjiang Weigan Catchment

Sampling and testing are conducted on the salt content of the groundwater in the 3 408 km 2 of Weigan watershed and semi-variograms function analysis is made afterwards based on the available data by using the geo-statistical method. Results showed that the variance curves of the groundwater salt content in the years 1998 and 1999 display a spherical model, while the curves in 1997 and 2000 exhibit a linear model. Analysis of water samples obtained from 1997 to 2000 indicates that the salt content varies both temporally and spatially in this area. The salinity increases, in the spatial scale, from northwest to southeast of the research area, with east and south higher than west and north separately, and southeast higher than northwest. And the groundwater salinity in the southeast is aggravating with the elapse of time. Geopack and Surfer 7.0 softwares are used to work out a spatio-temporal variation map of salt content, thus providing basis for the decision-making on water-soil management and salinization prevention in this area.