内蒙古德岭山地区灌溉农业发展对浅层地下水系统演化的影响

为了了解灌溉农业发展对浅层地下水系统演化的影响,该文以1979年内蒙古德岭山地区浅层地下水系统未遭受人类活动强烈干扰时的状态为初始状态,采用水均衡原理计算2008年地下水的各种补排量,并进行地下水质量评价。通过对比初始状态与现状条件下浅层地下水系统输入(补给项)和输出(排泄项)的变化、水动力场与水化学场的变化,分析该地区浅层地下水系统的演化方向和规模。研究结果表明:灌溉农业的发展已成为影响浅层地下水系统演化的主要因素。灌溉农业对研究区地下水系统动力场演化的影响主要表现为局部区域地下水水位的持续降低和地下水流场的剧烈变化;对地下水系统化学场演化的影响主要表现为地下水化学类型的改变和地下水污染的加重。

Effect of irrigated agriculture development on evolution of shallow groundwater system in Delingshan area, Inner Mongolia

In order to understand the effect of irrigated agriculture development on evolution of shallow groundwater system, shallow groundwater system condition of Delingshan area of Inner Mongolia in 1979 was taken as nature condition which was not strongly disturbanced by human activity. The variations of groundwater recharged and discharged in 2008 were calculated using water balance principle, and the groundwater quality was evaluated. The evolution direction and extent were analyzed by comparison of variation of shallow groundwater system input (supply item) and output (discharge item), as well as hydraulic field and chemical field under natural condition and current condition. The results show that irrigated agriculture has become the main factor of shallow groundwater evolution. The effect of irrigated agriculture on evolution hydraulic field of study area expressed in continued reduction of groundwater level and severe change of the groundwater flow field. The effect on evolution of groundwater system chemical field expressed in the change of groundwater chemical types and increase of groundwater pollution.