秦皇岛昌黎县海水入侵时空变化特征

Temporal and Spatial Variation Characteristics of Seawater Intrusion in Changli County of Qinhuangdao City

为研究秦皇岛市昌黎县沿海地区海水入侵时空变化特征,运用数理统计、Piper三线图以及Gibbs图等对2019年6月采集的18组水样进行分析,结果表明:目前昌黎沿海地区海水入侵呈减缓趋势;水化学类型主要以HCO_(3)-Na·Ca型、HCO_(3)·SO_(4)-Na·Ca型、HCO_(3)·Cl-Ca型、HCO_(3)·Cl-Na·Ca型和Cl-Na·Ca型为主;地下水主要受到蒸发-浓缩作用和咸淡水混合作用的共同影响;气候、水文地质条件、地形地貌、海水养殖等都可能造成海水入侵,但地下水的超量开采是造成海水入侵的主要影响因素。

In order to study the temporal and spatial variation characteristics of seawater intrusion in coastal areas of Changli County,Qinhuangdao City,we analyzed 18 groups of water samples collected in the study area on Jun.,2019 by using mathematical statistics,Piper trigram and Gibbs diagram.As the results show,the seawater intrusion in the coastal area of Changli County is slowing down at present,and its main hydrochemical types are HCO HCO_(3)-Na·Ca,HCO_(3)·SO_(4)-Na·Ca、HCO_(3)·Cl-Ca、HCO_(3)·Cl-Na·Ca、Cl-Na·Catype.The groundwater is mainly affected by evaporation-concentration and salt-freshwater mixing.The influencing factors of seawater intrusion are climate,hydrogeological conditions,topography,and mariculture etc.,but the overexploitation of groundwater is the main factor.