咸阳市气候变化与地下水变化趋势分析——以泾河两岸黄土高原区为例

Aanalysis on the relationship between groundwater table varying trend with climate change in Xianyang——A case study in loess plateau area at two sides of Jinghe River

针对咸阳市泾河两岸黄土高原区地下水位快速变化的现象,依据咸阳市1986-2008年地下水监测资料和气象资料,运用灰色系统理论和统计方法对该区的地下水动态变化特征、未来变化趋势及与气候变化的关系进行了分析。结果发现:①该区地下水水位变化滞后于降水变化的周期为3个月,地下水位以不同速率持续下降,到2010年、2011年地下水位将比2008年分别下降0.4 m和0.59 m。②该区在1961-2007年间气候呈明显干旱化趋势,影响着地下水位的变化,且deMartonne气候干燥度每上升10个单位地下水埋深减少0.13 m,每下降10个单位地下水埋深增加0.3 m,结果显示该区地下水系统长期得不到补给恢复,应受到重视。

Aimed at the phenomenon that the groundwater table changes very fast in loess plateau area of two sides of Jinghe River in Xianyang administer,based on Xianyang＇s 1986-2008 groundwater monitoring data and meteorological data,this paper analyzed the dynamic characteristics and future trend of groundwater and its relationship with climate change by methods of grey system theory and statistical.The results showed that the change of groundwater table laged 3 months behind precipitation variations and the water table declined continually in different rates.Compared with 2008,the groundwater level will decline respectively by 0.4m and 0.59m till 2010 and 2011.The climate change from 1961 to 2007 was a trend of drought which affecting the change of groundwater level.While de Martonne aridity increased by 10 units,the groundwater table reduced by 0.13m and while it declined by 10 unit,the groundwater level increased by 0.3m.The results indicated that the groundwater system had been lack of supplement and restoration for long time,which should be considered seriously.