摘要
针对华北平原地域广阔,地貌和水文地质条件复杂、地下水开发利用程度高,地下水位埋深、包气带和含水层岩性差异性大等特点,基于大量钻孔和地下水位监测资料,厘定了包气带岩性和地下水位埋深变化对脆弱性评价影响,进而建立适宜华北平原的DRITC评价指标体系,并应用于华北平原地下水脆弱性评价。评价中,根据华北平原水文地质条件,划分4评价分区,剖分2 km×2 km单元34 253个,采用地下水位埋深、净补给量、包气带岩性、含水层累积厚度和渗透系数5个因子作为评价指标,求得地下水脆弱性综合指数及脆弱性分布图。结果表明,华北平原山前冲洪积扇和古黄河冲洪积平原的现代黄河影响带地下水脆弱性高或较高。野外采样7 472组地下水有机污染测试分析结果佐证,脆弱性高或较高区有机污染检出项数多,其他地区较少,由此验证评价结果的客观性。
In the light of the characteristics of North China plain such as vast area,complex landform and hydrogeological conditions,high degree of groundwater exploitation,remarkable differences in buried depth of groundwater,aerated zone and aquifer lithology and on the basis of large quantities of drilling and groundwater level monitoring data,the authors redefined the influence of changes of aerated zone lithology and groundwater level depth on the groundwater vulnerability assessment,and established the DRITC evaluating indicator system suitable for North China plain and applied it to groundwater vulnerability evaluation.According to the hydrogeological conditions,the North China plain was divided into 4 appraisal districts and 34253 units of 2×2 km2.Groundwater level depth,net recharge,aerated zone lithology,aquifer accumulated thickness and hydraulic conductivity were taken as evaluation indexes,and then groundwater vulnerability composite index and distribution map were obtained.The results indicate that the groundwater vulnerabilities of piedmont alluvial-proluvial fan and Yellow River affected zone in old Yellow River alluvial-proluvial plain are high or very high.The test results of 7472 groups of groundwater organic pollution samples show that detected number of components is more in high or very high vulnerability areas and less in other areas,which validates the objectivity of the evaluation results.
出处
《中国地质》
CAS
CSCD
北大核心
2011年第6期1607-1613,共7页
Geology in China
基金
国家重点基础研究发展计划项目(2010CB428801-1
2010CB428804-1)
中国地质调查局国土资源大调查项目(1212010634600)资助
关键词
华北平原
地下水脆弱性
指标体系
改进
客观性
North China plain
groundwater vulnerability
indexes system
improvement
objectivity
