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对华北冲积平原曲周县的 139个观测点取样分析 ,测定了其浅层地下水埋深、地下水含盐量以及硝酸盐含量。应用地质统计学的方法对所取的数据进行了分析 ,结果表明 ,地下水埋深服从正态分布 ,地下水含盐量服从对数正态分布 ,硝酸盐含量既不服从正态分布也不服从对数正态分布。并且按一定的精度和置信水平确定了这三项的合理取样数目。通过半方差函数分析 ,发现这三者在一定范围内存在空间相关性。采用 Kriging方法对未测点进行了估值 ,绘制了等值线图 ,这对于合理利用浅层地下水资源、防治土壤的次生盐渍化及地下水的硝酸盐污染有着直接的现实意义。
A total of 139 observation spots in Quzhou County, an alluvial plain in North China, were sampled and analyzed. The shallow groundwater depth, groundwater salinity and nitrate content were measured. The geostatistical method was used to analyze the data. The results showed that the groundwater depth obeyed the normal distribution, the salinity of groundwater obeyed the logarithm normal distribution, and the nitrate content neither obey normal distribution nor obey Number normal distribution. And according to a certain degree of accuracy and confidence level to determine the reasonable number of these three sampling. Through semi-variance function analysis, we found that there is a spatial correlation between the three in a certain range. Kriging method was used to estimate the unmeasured points and draw the contour map, which is of direct practical significance for rational utilization of shallow groundwater resources, prevention and control of soil secondary salinization and groundwater nitrate pollution.