生态学报2017，Vol.37Issue(5)：1583-1594,12.DOI:10.5846/stxb201509291983
盐城滨海冲积平原孔隙承压地下水埋深对水质的影响
Influence of pore confined groundwater depth on the groundwater quality of the alluvial coastal plain of Yancheng
摘要
Abstract
Pore confined groundwater is an important fresh water resource for human beings.Pore groundwater is stored in systems of loose sedimentary aquifers.The spatial structure of the aquifer (or aquifer group) determines not only the spatial distribution pattern of groundwater,but also has some influence on the groundwater quality.Based on hydro-geological data and groundwater quality monitoring data collected between 2005 and 2014in the Yancheng coastal plain in China,methods including GIS and ANOVA were used to study the relationship between groundwater quality and the third confined aquifer buried depth.The groundwater quality dynamic evolution characteristics are also analyzed.Based on the conclusions,some recommendations are proposed to the local water resources management department.Firstly,based on the hydrogeological data in the study area,the buried depth Digital Elevation Model(DEM) was constructed and divided into 10 grades.The correlation between water quality factors and the aquifer buried depth was analyzed using variance analysis.The least significant difference method was used to determine the influence of different grading intervals on water quality factors.The average value of the monitored data for each year and for each buried depth interval was counted and time varying process curves of water quality factor levels were plotted to show the spatial and temporal variation of water quality factors with aquifer depth.The results showed that:in the study area,the Ⅲ confined aquifer buffed depth is mostly located between-118.9 m and-85.45 m.Owing to the variety of groundwater hydrogeological condition and different buried depths,some correlation between typical groundwater quality and aquifer buried depth is presented:Mineralization degree,total alkalinity and total bacterial count show the highest correlation with groundwater buried depth (69.67％,75.76％ and 58.09％ respectively).Correlation between total hardness factor and depth is moderate (49.18％).The potassium permanganate index is less influenced by the buried depth (35.2％).It was found that,the correlation between each factor and the groundwater buried depth in each buried depth grading interval showed significantly different dynamic evolution characteristics.In the area where the aquifer was deeply buried (-160.8 m to-99.12 m),the total hardness,degree of mineralization and total number of bacteria were significantly affected by the buried depth.The potassium permanganate index content only showed a significant difference with depth in specific depth intervals (between-99.12 m and-92.91 m and between-85.45 m and-75.09 m).In addition,water quality factors showed different spatial distribution characteristics:the area with higher potassium permanganate index and total bacteria is mainly located between Sheyang county and Huangsha Port.The highest mineralization factor content values were found in the middle and western regions,total alkalinity and total hardness factor varied little,the total alkalinity was slightly lower in the shallow buried area,andthe total hardness showed some upward trend.关键词
承压含水层/水质因子/含水层埋深/相关关系/动态演变Key words
confined aquifer/groundwater quality/aquifer buried depth/correlation/dynamic evolution characteristics引用本文复制引用
马钧霆,陈锁忠,何志超,朱晓婷..盐城滨海冲积平原孔隙承压地下水埋深对水质的影响[J].生态学报,2017,37(5):1583-1594,12.基金项目
国家自然科学基金资助项目(41571386) （41571386）
江苏省高校自然科学研究重大项目(10KJA170028) （10KJA170028）
