张掖盆地中部地下水位的时空变化及机理探讨

Temporal spatial variations of the groundwater level and its mechanism analysis for middle part of the Zhangye basin

地下水对于维持内陆河流域生态系统的稳定和健康至关重要。文中以张掖盆地中部的甘州和临泽沿河灌区为研究区域,分析了其近30年来地下水位的变化特征,揭示了变化原因。结果表明:研究区的三个分区的地下水位在2000年以前都呈现显著下降的趋势,2000年以后两个分区地下水位呈上升趋势,一个分区的地下水位下降趋势显著减缓。通过构建地下水的"消耗因子"和"补给因子",结合降雨、地表径流的变化,揭示了各分区地下水位不同变化趋势产生的原因。

Groundwater level is the key element to maintain the stability of the healthy ecosystem for the inland river basin. In this study,the spatial and temporal variations of groundwater levels in the Ganzhou district and the Linze irrigation area along the Heihe main river in recent 30 years were analyzed,and the driving factors for the variations were explored. The standardized groundwater levels decreased dramatically before 2000 for the three sub- regions. after 2000,two of the three sub- regions decreased,and the other sub- region showed a slightly decreasing trend. Two variables of the groundwater consumption factor（ GCF） and the groundwater recharge factor（ GRF） were put forward. The coupling of GRF and GCF,compiled with the variation of precipitation and runoff,were used to explain the variation of SGL of each sub- region.