黑河中游张掖绿洲地下水时空变异性分析

在干旱、半干旱区,地下水在维护生态可持续发展方面起着重要作用。地统计作为一种决策和管理工具已被许多学者应用于地下水的时空变异性研究。以黑河中游的张掖绿洲为例,运用地统计与GIS相结合的方法研究了地下水埋深的空间变异特征,绘制了各期地下水空间分布图。结果表明,主要受不同尺度的结构性因素的影响,地下水埋深具有强烈的空间相关性,变异函数为各向异性结构。对Kriging插值结果表明,张掖绿洲地下水埋深整体上从西南到东北逐渐变浅,且呈普遍下降趋势。

Spatio-Temporal Variability of Groundwater Level in the Middle Heihe River Basin

Groundwater plays a significant role in conserving the sustainable development of ecological environment in arid and semi-arid regions. As a management and decision tool, the method of geostatistics has been widely applied to study the spatio-temporal variability of groundwater level. Taking the Zhangye Oasis in the middle Heihe River Basin as an example, the authors have analyzed the spatial heterogeneity of groundwater depth in this area and have figured out the distribution of groundwater resources by the geostatistics method combined with GIS. The results indicated that the groundwater depth distribution exhibit strong spatial variability mainly controlled by structural factors on different scales, and the variograms are anisotropy. The map of groundwater level contours interpolated by the Kriging interpolation showed that there is a decreasing trend in groundwater depth from southwest to northeast in Zhangye Oasis.