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基于策勒绿洲78个取样点的地下水的观测资料,结合地理信息系统,运用地统计学方法和Sigmaplot10.0中的Piper模块,研究塔里木盆地南缘策勒绿洲区地下水TDS(Total Dissolved Solids)的时空变异,揭示地下水水化学特征及其演变的主要水化学过程。结果表明:①地下水TDS存在强烈的空间相关性,其空间相关距离为4.4km,在步长为6 km范围之内,地下水TDS的空间变异是各向同性的,当步长大于6 km时,4个方向上的半变异函数发生了不同的变化;②绿洲南部区域为地下水TDS的低值区,最小值为551 mg.L-1,由南向北地下水TDS呈增加的趋势,在北部地下水埋深低值区的TDS最大值为7 192 mg.L-1;从地下水水流方向上看,即从绿洲西南的低值区向北,再转向东北区方向,地下水TDS逐渐增加,最大值为3 677 mg.L-1;③浅层地下水化学类型变化复杂,主要从Na-Ca—SO4-Cl-HCO3、Na-Ca—SO4-Cl型向Na—SO4-Cl-HCO3和Na—SO4-Cl型演化。
Based on the observation data of groundwater at 78 sampling sites in Ceze Oasis and using the Geostatistics method and the Piper module in Sigmaplot 10.0, the effects of TDS (Total Dissolved Solids) in the Cele oasis area on the southern margin of the Tarim Basin Spatiotemporal variation reveals the hydrochemical characteristics of groundwater and its main hydrochemical processes. The results show that: (1) There is a strong spatial correlation of groundwater TDS with a spatial correlation distance of 4.4km. Within a range of 6 km, the spatial variation of TDS in groundwater is isotropic. When the step length is greater than 6 km, The semi-variogram in the four directions changed a lot. ② The southern Oasis area is the low value area of groundwater TDS with the minimum value of 551 mg.L-1. The trend of groundwater TDS from south to north tends to increase. The maximum value of TDS in the low buried-depth region was 7 192 mg.L-1. From the direction of groundwater flow, from the low value region in the southwest oasis to the north and then to the northeast direction, the TDS of groundwater increased gradually 3 677 mg · L-1. (3) The chemical types of shallow groundwater changed more and more. The main types were Na-SO4-Cl-HCO3 and Na-SO4- Cl type evolution.