焉耆盆地浅层地下水埋深与TDS时空变异及水化学的演化特征

采用地统计学经典理论分析了焉耆盆地不同时期地下水TDS和埋深在时间和空间的变异特征,对盆地平原区浅层地下水TDS不同时期(1999、2003和2005年)的实测数据进行了半方差函数分析,地下水埋深服从正态分布,地下水TDS服从对数正态分布。地下水TDS和埋深在时间和空间上都存在明显的间变异性,地下水TDS在开都河中下游地区及其二岸灌区有增加的趋势;地下水随时间推移向盐渍化加重方向发展;地下水各项离子浓度都在积聚。利用地学统计VARIWIN2.2和MAPGIS6.5软件绘制了地下水TDS和埋深时空分布格局图,为该地区地下水资源的管理以及防止土壤盐渍化提供理论依据。

The Spatio-temporal Variation of Shallow Groundwater TDS, Depth and It's Evolvement Characteristic of Water Chemistry in Yanqi Basin

Based on classic theory of geo-statistics,this paper analysis the variation characteristic of groundwater TDS and depth in time and space,and reveal the rule of groundwater content salt spario-temporal variation.According to the observed data of shallow groundwater TDS and depth in different periods(1999,2003 and 2005) in Yanqi Basin,Xinjiang and semi-variance function analysis is made afterwards on the data obtained by the application of geo-statistics.The results indicated that the depth of groundwater showed a normal distribution,the groundwater TDS showed a lognormal distribution and the TDS and depth of groundwater varies both temporally and spatially in the area.In the spatial scale,the TDS of groundwater tends to increases in the medium-lower reaches of Kaidu river basin and its bank irrigation area,while in the time scale,the groundwater salinity is aggravation from top to bottom and as a whole,And the groundwater salinity is aggravating with the elapse of time;the evolvement characteristic of groundwater water chemical are analysis,it showed that each hydronium concentration of groundwater is accumulate.VARIWIN2.2 and MAPGIS6.5 software are used to work out a spatio-temporal distributing map of groundwater mineralization degree and depth,thus providing theory basis for make on groundwater-salt management and salinization prevention in this area.