西安市潜水埋深与降水量的关系分析

Analysis on Correlation between Groundwater Table and Precipitation in Xi'an City

降水入渗是地下水重要的补给来源，研究地下水与降水的关系，可为区域性城市降雨“蓄、渗、用、排”的有机协调提供重要的依据。根据已有的西安市潜水埋深和降水量数据分析了潜水埋深与降水量的关系。从年际间关系来看，1983～2003年洪积平原地区潜水埋深和降水量的相关性最大，相关系数为0．6799，而黄土台塬地区仅为0．228。从潜水变化量与降水变化量间的关系来看，2002～2003年潜水埋深的年变化量与年降水变化量之间的相关性为0．482；对比99组潜水埋深月变化与月降水量变化的数据发现，仅有40组能说明潜水埋深的月变化与降水的月变化有一定的关系。

The rainfall infiltration is one of the important replenishment sources for the increasing groundwater table. Analysis of the correlation between groundwater table and precipitation can provides theoretical reference for the infiltration of regional urban rainfall utilization. According to the given dates of groundwater table and precipitation from related gauging stations, this paper arrMyzed the correlation between groundwater table and precipitation in Xi＇an city. The result shows that the coefficient of the annual groundwater table and annual mean precipitation is 0. 6799 in flood plain areas, which is the largest, while the smallest one is 0. 228, which occurs in the loess tableland during the period of 1983-2003. The coefficient between the annual variation of groundwater table and annual variation of precipitation is 0. 482 from 2002 to 2003. From the comparative analyses of correlation between the monthly variations of groundwater table and precipitation on the basis of 99 data sets of them in 2003, only 40 data sets show the considerable correlation.