摘要
为探讨河道生态补水对受水区地下水水质的影响,收集引温济潮受水区2007年、2013年和2018年不同含水层的地下水水质数据,采用描述性统计分析水质参数的变化特征,利用Piper三线图分析生态补水后受水区不同含水层地下水水化学相,同时利用吉布斯(Gibbs)图与离子比值图分析地下水水化学特征的控制因素,并通过改进的综合水质指数法(MIWQI)对受水区进行水质评价。结果表明:不同含水层中阴阳离子分别以HCO_(3)^(−)和Ca^(2+)为主导;水岩相互作用和人类活动是地下水中离子变化的主要驱动因素;引温济潮生态补水后受水区地下水水质有所改善。其中:2007年较差水质点位占4.4%,2013年河道生态补水5年后,没有较差水质点位;对评价方法所选水质指标进行敏感性分析,其敏感性指标较小,未超过2.0%,表明所选指标能较好表征水质评价结果。
With the acceleration of urbanization,groundwater has been overexploited for a long time in order to support the development of Beijing,groundwater recharge and drainage are seriously unbalanced,and groundwater level has been greatly reduced.Dry years have resulted in a sharp decrease in the amount of surface water resources.The good infiltration conditions of the piedmont alluvial fan have made the river with a sudden decrease in flow rapidly infiltrate and replenish the groundwater,resulting in the interruption of the river flow.Artificial recharge engineering is the most convenient and effective means to solve the shortage of water resources.However,once the shallow groundwater quality tends to deteriorate due to the infiltration of surface pollution components,the affected shallow groundwater will continue to advance to the deep layer,and the potential pollution risk of groundwater will intensify.Based on the groundwater data of“from Wenyu River to Chaobai River”project in 2007,2013 and 2018,descriptive statistics were used to analyze the variation characteristics of water quality parameters,Piper trigram was used to analyze the groundwater hydrochemical phases of different aquifers in the water receiving area after ecological water replenishing,and Gibbs diagram and ion ratio diagram were used to analyze the controlling factors of groundwater hydrochemical characteristics.The water quality of the receiving area was evaluated by the improved comprehensive water quality Index method(MIWQI).The results show that the pH values of different aquifers are neutral to weakly alkaline,and the main cations and anions are Ca^(2+) and HCO_(3)^(−).The groundwater chemical type changes from HCO_(3)^(−)-Ca·Mg in 30 m aquifer to HCO_(3)^(−)-Na·Ca·Mg in 50 m aquifer.The samples of different aquifers mainly fall in the dominant rock zone.The overall quality of groundwater is good,with medium,good and excellent water quality accounting for more than 90%of the total number of samples.Sensitivity analysis showed that HCO_(3)^(−) index had the greatest influence on the score of MIWQI,and Ca^(2+) index had the least impact on the score of MIWQI,but their sensitivity values were not exceeded 2%.It was verified that MIWQI did not overly dependent on one or several parameters,and all parameters play a role in water quality evaluation.The index concentration of 50 m aquifer is basically lower than 30 m aquifer.The dissolution of rock salt and silicate,cation exchange and human activities are the driving factors of the change of main ions in the water body.Water quality index method based on entropy weight(MIWQI)method could describe the overall water quality reliably,accurately and stably.These findings can provide reference for groundwater management and sustainable development of water resources.
作者
杨红遍
刘然
李炳华
戈印新
YANG Hongbian;LIU Ran;LI Binghua;GE Yinxin(Shijiazhuang Water Supply Co.,Ltd,Shijiazhuang 050011,China;Beijing Chaoyang District Water and Soil Conservation and Science and Technology Management Center,Beijing 100024,China;Beijing Water Science and Technology Institute,Beijing 100048,China)
出处
《南水北调与水利科技（中英文）》
CAS
CSCD
北大核心
2023年第4期689-699,共11页
South-to-North Water Transfers and Water Science & Technology
基金
国家自然科学基金项目(41730749)。
关键词
引温济潮
受水区
水化学特征
水质评价
from Wenyu River to Chaobai River
water-receiving area
hydrochemical characteristics
water quality assessment
作者简介
杨红遍(1968-),男,河北石家庄人,高级工程师,主要从事给排水领域研究。E-mail:1363545943@qq.com;通信作者:李炳华(1975-),男,江西南昌人,教授级高级工程师,博士,主要从事地下水污染和再生水安全利用研究。E-mail:libinghua@163.com。
