北京北运河流域平原区地下水水质空间分布特征

Spatial distribution characteristics of groundwater quality in Beijing north canal watershed

选取17项指标,采用国标推荐的地下水水质综合质量评价方法,评价了北京北运河流域平原区地下水水质;在map GIS中利用其空间分析功能,采用克里格插值方法,绘制了地下水水质空间分布图,并分析了其空间分布特征、成因及主要影响指标。结果表明:北京北运河流域平原区地下水水质呈现自西北向东南水质逐渐变差的特征。水质空间分布特征的形成是自然条件与人为因素耦合作用的结果。水质较差和极差区的主要影响指标有总硬度、溶解性总固体、硝酸盐氮、氨氮、亚硝酸盐氮、铁和锰。

Groundwater quality in Beijing North Canal Watershed was evaluated by selecting seventeen indicators and taking comprehensive quality evaluation method of groundwater quality that is recommended by Chinese standard.Spatial distribution maps of groundwater quality were drawn by using spatial analysis function of map GIS and employing Kriging interpolation method, and spatial distribution characteristics, cause of characteristics and main influence indicators were analyzed.The results show that groundwater quality in Beijing North Canal Watershed takes on characteristic of gradual deterioration from northwest to southeast , which is caused by natural conditions and human factors.The main indicators of poor water quality and poor range are total hardness, total dissolved solids, nitrate nitrogen, ammonia nitrogen, nitrite nitrogen, iron and manganese.