论文部分内容阅读
根据民勤绿洲1999～2008年51眼地下水位观测井资料和2010年采集的30个地下水水样资料,利用传统统计学和地统计学分析方法对该地区新时期地下水位时空变化动态和地下水化学特性进行了研究。结果表明:民勤绿洲地下水位近10年来总体呈逐年下降的趋势,年均降幅达0.52m;在引黄民调工程、石羊河流域分水方案等政策措施的影响下,2005、2007和2008年地下水位降幅均呈现减小趋势,并在2007年首次出现0.01m的回升;坝区和泉山区地下水位年均降幅较湖区分别高0.23m和0.52m,下降速度明显快于湖区;整个绿洲区地下水平均矿化度为3.34g/L,沿地下水流动方向,地下水化学类型变化较大,由坝区和泉山区南部的SO42--HCO-3-Na+或SO42--HCO-3-Ca2+型淡水-微咸水逐渐变为湖区的SO2-4-C1--Na+-Mg2+咸水-苦咸水。
According to the observation data of 51 groundwater table and the 30 groundwater samples collected in Minqin Oasis from 1999 to 2008, the authors analyzed the temporal and spatial dynamics of groundwater table and groundwater chemistry in the new period by traditional statistical and geostatistical methods Characteristics have been studied. The results show that the total water table of Minqin Oasis has been declining year by year in recent 10 years, with an average annual decline of 0.52m. Under the influence of policy measures such as the Yellow River Diversion Project and the Shiyang River Basin Water Diversion Scheme, In 2008, the decline of groundwater level showed a decreasing trend and the first recovery of 0.01m occurred in 2007; the average annual drop of groundwater level in Hequ Mountain area was 0.23m and 0.52m higher than that of Lake District respectively, The average salinity of groundwater in the area is 3.34g / L, and the chemical types of groundwater vary greatly along the direction of groundwater flow. The groundwater is composed of fresh SO42 - HCO - 3 - Na + or SO42 - HCO - 3 - Ca2 + - Brackish water gradually becomes SO2-4-C1-Na + -Mg2 + salt water-brackish water in the lake area.