基于地统计学的伊犁河谷西部霍城县平原区地下水特征空间变异性分析

Study on spatial variability of groundwater properties in Huocheng county plain located in western Yili River

运用经典统计学及地统计学的方法,对伊犁河谷西部霍城县平原区地下水化学及空间变异特征进行研究。结果表明:HCO_3^-和Ca^(2+)是主要的水化学特征离子,含量稳定;从山前到下游平原区水化学分带性较明显,水化学类型由HCO_3-Ca-Mg渐变为HCO_3-SO_4-Ca型,最终过渡为HCO_3-SO_4-Ca-Mg型;地下水埋深和TDS主要受以自然条件为主的结构性因素影响,表现为强空间变异性,变异曲线分别符合指数模型和球状模型;埋深的空间分布更为均匀连续,自北向南呈带状变化;TDS与埋深在空间分布上存在一定相关性,高矿化度区均分布在地下水的浅埋区。

Based on classical statistics and geo-statistics,We analyzed hydro-chemical characteristics and spatial variability of groundwater in Huocheng county plain located in western Yili River Basin. The result indicated that： bicarbonate and calcium are the major hydrochemical characteristic ions of groundwater; the contents of them are steady. From the piedmont area to downstream plain,the hydro-chemical types show the zonal variation,and change from HCO_3-Ca-Mg to HCO_3-SO_4-Ca,finally turn into HCO_3-SO_4-Ca-Mg. Mainly affected by structural factors,like natural conditions,depth and TDS exhibited high spatial variability,their variation curves belong to spherical model and exponential model,respectively. The spatial distribution of groundwater depth is more uniform and continuous,showing zonal decrease from north to south. There is a certain correlation between TDS and depth in spatial distribution,all the high salinity zones distribute in the shallow buried zones of groundwater.