A study on the structure of the quaternary aquifer in the eastern plains of Henan Province
As an important agricultural area in China,the Quaternary aquifer structure in the eastern plains of Henan is complex and variable,and the aquifer structure has not yet been clarified,so it is particularly important to find out the spatial distribution of groundwater and the characteristics of the aquifer property structure in the study area.This paper is based on Groundwater Modeling System 5.0 software and utilises159 eyes in boreholes with an average density of 2.4 eyes/1 000 km2.The borehole data were divided into epochs,the principle of stratigraphic consolidation and stratigraphic numbering were deter-mined,and the Quaternary aquifer structural model was established to study the geological structure of the Quaternary and aq-uifer attribute characteristics in the plain area of eastern Henan Province.The results show:(1)The Quaternary aquifer in the plain area of eastern Henan has more fine sand,fine sand,silt,and powdery fine sand,but the distribution is uneven.(2)The permeability coefficient of shallow groundwater in the study area is less than 1m/d in the granular plain,1～30 m/d in the low and gentle plain,and more than 30m/d in the north of Zhengzhou,the south-west of Jiaxian and the west of Yexian;The thickness of the middle and deep water-bearing sand layer is 20～50 m,60～80 m in Kaifeng County,eastern Luohe,Xin-cai County and Taikang County.(3)The number of water-conducting systems in the study area ranges from 50 m2/d to the upper and lower limits of 200 m2/d,and the number of water-conducting systems in individual prefecture-level counties(such as Kaifeng and Xincai Counties)and municipalities(such as Shangqiu and Luohe)exceeds 300 m2/d,and in some cases,it even exceeds 500 m2/d.The results of the study are of great significance to the mastery of the law of groundwater storage in the eastern plains of Henan Province,the sustainable development and rational use of groundwater resources,so as to achieve the comprehensive development and implementation of scientific and optimal management of water resources.
Henan Provinceeastern plainquaternarystructural modelling of aquifers
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