气候变化条件下咸阳市城区降水入渗补给时空分布特征研究

Experimental study on temporal and spatial distribution characteristics of precipitation replenishment in Xianyang under Climate Change

降水入渗补给受诸如气象、下垫面等多种因素影响和控制,由于这些制约因素的复杂性以及刻画它们的不确定性,因此降水入渗补给呈现出复杂的变化。基于1985-2015年的降水和地下水位监测资料,分析咸阳城区降水的变化趋势,用动态资料分析法计算研究区的入渗补给系数值,做出研究区上世纪90年代和本世纪近15年的降水入渗补给系数分布图,并求得相应的降水入渗量。结果表明,30多年来尽管咸阳城区降水量呈增加的趋势,但是降水入渗补给系数呈减小的趋势,其综合作用的结果是降水入渗量呈减少的趋势。三个年代的降水入渗量分别为3 034.2万m^3,2 821.2万m^3,2 723.6万m^3。

Precipitation infiltration is affected and controlled by many factors such as meteorology and underlying surface, because of the complexity of these constraints and depict their uncertainty, so precipitation infiltration recharge present a complicated changes based on the 1985 to 2015 of precipitation and underground water level monitoring data, the analysis of variation trend of precipitation in Xianyang city, using the dynamic information analysis method to calculate infiltration coefficient value in the study area, make the study area in the 1990 s and distribution of precipitation infiltration coefficient of nearly 15 years of this century, and obtained the corresponding amount of precipitation infiltration The results show that in the past 30 years, although the precipitation in Xianyang urban area shows a trend of increase, the precipitation infiltration recharge coefficient shows a trend of decrease. The comprehensive effect shows that the precipitation infiltration volume shows a trend of decrease, and the precipitation infiltration volume in the three years is respectively 30 342 000 m^3, 28 212 000 m^3 and 27 236 000 m^3.