Analysis of time stability and variation characteristics of groundwater conductivity in Qingtongxia Irrigation area
Soil salinization is one of the main factors restricting the social and economic development in Qingtongxia irriga-tion area.Based on the analysis of the time stability and change characteristics of groundwater conductivity in Qingtongxia irri-gation area,it is of great significance to predict the change of groundwater conductivity quickly and effectively.Based on the monitoring data of 36 Wells at 19 time points in Qingtongxia irrigation District,the relative difference method and Spearman rank correlation coefficient method were used to analyze the temporal stability characteristics of groundwater conductivity,which provided a reference for reducing the risk of soil salinization.The results show that the groundwater in Qingtongxia irriga-tion area is mostly brackish water and medium brackish water,and the electrical conductivity of the groundwater varies moder-ately,with the coefficient of variation ranging from 62％to 67％.In the whole monitoring period,the groundwater conductivi-ty did not show an obvious increasing trend,indicating that the groundwater quality in this area is relatively stable.The greater the conductivity value,the greater the change.The groundwater conductivity shows obvious spatiotemporal stability,and its representative location is 27# monitoring well.The residual sum of squares between the average groundwater conductivity in this area and the groundwater conductivity predicted by the 27# monitoring well is only 0.008,which basically represents the change law of groundwater conductivity in this area.This point can be used to quickly and effectively predict the change of groundwater conductivity in this area,thus providing a scientific basis for reducing the risk of soil salinization.
Qingtongxia irrigation areaelectrical conductivity of groundwatertemporal stability
NETL
NSTL
万方数据
