干旱区微咸水灌溉对地下水环境影响的研究

本研究利用MODFLOW模型和MT3DMS模型对内蒙河套地区的一个灌区微咸水灌溉条件下的地下水位、水量、水质和含盐量进行了系统的模拟分析。结果表明，在抽取地下水灌溉后地下水位略有下降，10年后水位降深量仅为0.057～0.11m，可达到动态平衡。两种灌溉水平下，含水层盐分有增加趋势，但增加幅度较小，在4％～9％之间。采用微咸水灌溉，淋洗灌溉定额比正常灌溉定额的方案对环境有利，虽然淋洗灌溉定额也使含水层盐分增加，但就增加的幅度看，在未来相当一段时间内不会造成严重的环境问题。

Study on effect of brackish water irrigation on groundwater environment in arid area

The Visual-MODFLOW and MT3DMS models are applied to study the effect of brackish water irrigation on groundwater table, water content, water quality and saline concentration in an irrigation district located in Inner Mongolia Autonomous. The results show that the groundwater table will drop down about 0.057-0.11m in 10 years. The salinity in aquifer will increase by 4% -9%. The adoption of leaching treatment is effective in mitigating the effect of blackish water irrigation. Though the salt in aquifer will be slightly accumulated, the environment will not be deteriorated even in a long term.