应用物理混合方法分析东海岛滨海地下水K^+的迁移特征  

Analysis on K^+'s Migration Behavior of Groundwater in Coastal Area of Donghai Island by Physical Mixture Theory

作　　者：黄向青[1] 甘华阳[1] 刘鑫[1] 路剑飞[1] 潘毅[1] 

机构地区：[1]国土资源部广州海洋地质调查局海底矿产重点实验室,广州市510760

出　　处：《勘察科学技术》2015年第2期14-19,共6页Site Investigation Science and Technology

基　　金：中国地质调查局"我国重点海岸带滨海环境地质调查与评价"(编号1212010914020)

摘　　要：依据雷州半岛以东的东海岛滨海地下水测井潮周期取样测试数据,以Cl-为保守离子,应用了物理混合理论方法,探讨了在海水入侵过程中通过孔隙介质时K+的迁移性。结果显示,K+含量呈现波动势态,绝对含量明显低于Cl-、Na+,但相对变化幅度则与两者相近;其保守性低于Na+和Mg2+,实测数据点均位于理论稀释线TDL的下方,通过孔隙介质之后K+具有明显的向固相迁移行为;实测K+以及理论计算的ΔK+与Cl-同样保持线性关系,ΔK+在两个潮周期平均依次为-22.30mg/L和-14.37mg/L,潮周期逐时变化曲线与Ca2+具有反相特征,K+同样参与了阳离子置换,ΔγK+在-1.75^-0.09meq/L之间,其时间变化趋势有线性和对数缓慢单增关系。According to the sampling test data of tidal cycle of groundwater observation-wells in Donghai island coastal area ,east of Leizhou peninsula , taking the Cl -as the conservative ion , using the physical mixture theory method ,the K ＋′s migratory aptitude is discussed during the seawater intrusion and through the porous media .The results show that the content of K ＋shows a fluctuant trend .The absolute content of K＋is lower than Cl -and Na ＋obviously , but its relative change range is close with Cl -and Na ＋.The K＋′s conservation is lower than Na ＋and Mg2＋,and the measured data points are all under the TDL . Passing through the porous media ,the K＋has the solid migration behavior obviously .The measured K ＋and the theoretical calculated ΔK＋all keep linear relationship with Cl -,and the content of ΔK＋is -22. 30mg/L and -14.37mg/L in average in turn in two tidal cycles .The ΔK＋′s tidal cycle change curve presents contrary character with Ca 2＋.The K＋involves in cation exchange too .TheΔγK＋is in the range of-1.75^-0.09meq/L,the linear and logarithm present monotone increasing relationship about its change trend with time .

关 键 词：地下水 钾离子 稀释混合理论 行为 

分 类 号：P641.2[天文地球—地质矿产勘探]