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选取额济纳三角洲14口自动观测井日尺度的地下水位埋深观测值(2010.4-2011.4)作为数据基础,运用SPSS 18.0软件中的描述性分析,趋势分析和K-means聚类分析模块,对额济纳三角洲地下水位年内动态变化特征进行了分类分析。结果表明:研究区地下水位年内动态变化空间上存在着较大的差异性,其地下水位动态可分为四种波动类型。其中,类型Ⅰ主要分布在远离河道的荒漠地带,地下水位动态变化较为稳定;类型Ⅱ的观测井靠近东西河,地下水与河水不断的发生交换,多次的抬升下降是该类型地下水位动态变化的典型特征。类型Ⅲ主要分布于东河下游绿洲区,地下水位动态变化主要受人为调控的地表径流影响,地下水位剧升后缓慢下降是该波动类型的典型特征;类型Ⅳ分布在远离河道的绿洲区周边地带,其地下水位动态变化呈显著的下降趋势,地下水位缓慢下降是此波动类型的典型特征,这与地下水不断以蒸散发形式排泄,且得不到补给有关。
Based on daily observation of groundwater level at 14 automatic observation wells in the Ejin Delta (2010.4-2011.4), the descriptive analysis, trend analysis and K-means clustering analysis module of SPSS 18.0 software were used to analyze the Ejina Delta Groundwater table during the year of the dynamic characteristics of the classification analysis. The results show that there is a big difference in the spatial variation of groundwater table in the study area during the year, and the groundwater level dynamic can be divided into four types. Type I is mainly distributed in the desert area far away from the river course, and the dynamic change of groundwater level is relatively stable. Type II observation wells are close to East and West rivers, and groundwater continuously exchanges with river water. The multiple uplift and descent is the dynamic change of groundwater level Typical characteristics. Type Ⅲ is mainly distributed in the oasis area of the lower reaches of the East River. The dynamic changes of groundwater level are mainly influenced by surface runoff controlled by man-made changes. The slow decline of the groundwater level is a typical feature of this type of fluctuation. Type Ⅳ is distributed around the oasis area far away from the river course , The dynamic change of groundwater level shows a significant downward trend, and the slow decline of groundwater level is a typical feature of this type of fluctuation. This is related to the constant discharge of groundwater in the form of evapotranspiration and lack of recharge.