北京市大兴区浅层地下水水质时空变化分析

Water Quality Spatial and Temporal Variation of Shallow Groundwater in Daxing District of Beijing

对大兴区浅层地下水的主要污染物进行时空动态及原因分析。结果表明,大兴区浅层地下水的主要污染指标含量比较高,尤其是总硬度含量超标严重,硝酸盐氮含量局部地区偏大,氨氮含量变化不明显。总体来说,地下水水质南部和东部水质好于北部和西部地区。污染源(包括工业废水、居民生活污水、农业面源污染)的分布以及表层地质环境和地下水贮存条件对地下水水质有很大影响,大兴区急需建立完善的地下水资源利用和保护机制。

The space analysis function of ArcGIS is used to display the main pollutants spatial distribution of shallow groundwater in Daxing District, get the distribution and variation diagrams. And the water quality monitoring data of shallow groundwater for nearly 20 years are used to get the trend charts, the change of the main pollutants are analyzed. Then the reason why the spatial-temporal changes of water quality of shallow groundwater happen is analyzed. Results show that the main pollution indexes of shallow groundwater in Daxing District are higher, and total hardness largely exceeds the norm. The southern and eastern water quality is better than that in other parts. Distribution of pollution sources, surface geological environment and the conditions of groundwater storage mainly influences water quality. Daxing District needs to establish and perfect the mechanism of the utilization and protection of groundwater resources.