黄河三角洲地区典型地块地下水特征的空间变异性研究

以黄河三角洲地区典型地块为研究区,运用经典统计学和地统计学相结合的方法研究了包括埋深和含盐量的地下水性质空间变异特征,绘制了各地下水特征的随机性和结构性的半方差图和空间分布图。结果表明:受不同尺度的结构性因素和随机性因素的共同作用,地下水埋深和含盐量均具有中等的变异强度和空间自相关性,地下水埋深的自相关距大于含盐量。对Kriging插值结果分析表明:地下水埋深的空间变异性受微地形因素及农田工程措施影响较大,长期的农业生产措施会影响地下水含盐量的空间分布,地下水含盐量空间变异性与埋深有一定的关联。地下水特征的空间结构性和定量化研究对黄河三角洲地区地下水资源评价、土壤的次生盐碱化防治及区域水盐运动调控有着直接的现实意义。

Spatial Variability of Groundwater Properties in some typical Areas of the Yellow River Delta

Spatial variability of groundwater properties including groundwater depth and salt content was measured and analyzed by using classical statistics and geo-statistics and typical areas of the Yellow River Delta were selected.Spatial distribution maps and semi-variograms that can explicitly explain the random and structural variability of groundwater properties were also developed.The results indicated that groundwater depth and salt content exhibited moderate spatial variability and autocorrelation due to the compound impact of structural and random factors in different scales,and the range of groundwater depth was larger than that of groundwater salt content.The spatial distribution map of groundwater properties interpolated by the Kriging interpolation showed that spatial variability of groundwater depth was greatly affected by micro-topography and some farm engineering measures,but long-term agricultural measures had an effect on the spatial distribution of groundwater salt content,and to some extent the spatial variability of groundwater salt content was related to groundwater depth.The study on the spatial variability and the quantification of groundwater properties is important in assessing groundwater resource,preventing soil from secondary salinization and regulating regional water flow and salt transport in the Yellow River Delta.