基于电导率的米山水库水质演变分析

Water Quality Evolution Analysis of the Mishan Reservoir Based on Electrical Conductivity

以具有胶东调水工程末端调蓄功能的米山水库1987—2019年长系列水文及水质监测资料为基础,分析水体电导率的变化趋势及其影响因素。结果表明:受调水影响,2016—2019年米山水库水体平均电导率较1987—2015年的增大了1.56倍,达到858μS/cm,氯化物、硫酸盐和钠的浓度也明显增大,并且与水体电导率变化趋势一致;水体电导率受降雨量、客水水质、调水周期和调水量的综合影响,呈现汛期减小、非汛期增大的周期性变化趋势;水体电导率年均值与降雨量呈负相关,而与外调水量、客水水质呈正相关。

Based on long series of hydrological and water quality monitoring data of the Mishan Reservoir from 1987 to 2019 having terminal storage function of Jiaodong water transfer project,variation trend of electrical conductivity of water bodies and its influencing factors were analyzed.The results show that affected by water transfer,the average electrical conductivity of water bodies in the Mishan Reservoir increases by 1.56 times from 2016 to 2019 comparing with that from 1987 to 2015,which increases to 858μS/cm.The concentration of chloride,sulfate,and sodium also increases significantly with the same trend of electrical conductivity of water bodies.The electrical conductivity of water bodies in the Mishan Reservoir is affected by precipitation amount,guest water quality,water transfer cycle,and water transfer volume,showing a periodic trend of declining during flood season and increasing during non-flood season.The annual average electrical conductivity of water is negatively correlated with amount of precipitation,while it is positively correlated with transferred water transfer volume and guest water quality.