怀柔区应急备用地下水源地热备涵养阶段水质演变特征分析
Analysis of water quality evolution characteristics in conservation stage of Huairou emergency standby underground water source
李阳 1李宝学 1尹怀庆 2张晓倩 3杨煜3
作者信息
- 1. 北京市工程地质研究所 北京 100048
- 2. 北京燕龙水务集团有限公司 北京 102200
- 3. 北京市京密引水管理处 北京 101400
- 折叠
摘要
怀柔应急备用地下水源工程是为了在连续干旱年份保障北京市有序供水而采取的一项应急备用措施,水质状况是水源地供水规划制定的基础,对供水可靠性的影响极大.选取靠近南水回补区的北支、南支2个点位2015-2022年每年年底深井、浅井共32件水质监测数据,确定总硬度、溶解性总固体、硝酸盐氮等8个不同类型的监测指标,共256组数据,基于主成分分析法转换为2个主成分,综合评价了怀柔应急备用水源地热备涵养阶段水质的年际变化特征及变化趋势.结果表明:怀柔应急备用地下水源地水质整体优良,能够满足供水需求.主成分1代表可溶盐组分,在南水回补的条件下,因水位上升,地下水对非饱和带的浸润,使得非饱和带富集的可溶盐进入地下水,使得地下水可溶盐组分上升,随着回补持续,优质南水的持续回补又对地下水进行稀释,使地下水可溶盐组分下降.主成分2所表示的有机物组分特征,同样受南水回补影响较大,地下水对南水回补的响应直接;整体上随着南水的持续回补,优质南水对区域地下水水质状况有进一步的改善作用.此研究可为应急水源管理提供依据.
Abstract
Huairou emergency standby underground water source project is an emergency measure ad-opted to ensure orderly water supply of Beijing in continuous drought years.Water quality is the basis of water supply planning of water source area,which has a great impact on water supply reliability.In this study,a total of 32 pieces of water quality monitoring data of deep wells and shallow wells from year 2015 to 2022 were selected from the north and south branch near the south water recharge area.Eight different types off monitoring indicators,including total hardness,total dissolved solids and nitrate nitrogen were determined.A total of 256 sets of data were collected and converted into two principal components based on the method of principal component analysis and the interannual variation characteristics.The variation trend of water quality in the geothermal preparation and conservation stage of Huairou emergency standby water source were evaluated comprehensively according to this method.The results showed that the over-all water quality of Huairou emergency standby underground water source was good and could meet the demand of water supply.PC1 represented the soluble salt component.The soluble salt enriched in the un-saturated zone under the condition of south water recharge,which would enter the groundwater and make the soluble salt composition of the groundwater rise due to the rise of water level and the infiltration of groundwater into the unsaturated zone.With the continuous replenishment of high-quality south water,the soluble salt composition of the groundwater would be diluted,and the soluble salt composition of the groundwater would decrease.The characteristics of organic compounds represented by PC 2 were also greatly affected by the south water recharge.The response of groundwater to the south water recharge was direct.On the whole,high-quality south water can further improve the regional groundwater quality with the continuous replenishment of south water.
关键词
怀柔/应急备用地下水源地/主成分分析/地下水质量Key words
Huairou/emergency standby underground water source/principal component analysis/groundwater quality引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据