LTC水位仪水压和盐度系统误差的检验与校正  

Test and calibration of water pressure and salinity measurement by using a LTC Levelogger Junior

作　　者：罗满华 李海龙 王学静[1] 李刚 LUO Manhua;LI Hailong;WANG Xuejing;LI Gang(School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong518055,China;School of Water Resources and Environment,China University of Geosciences(Beijing),Beijing100083,China)

机构地区：[1]南方科技大学环境科学与工程学院,广东深圳518055 [2]中国地质大学(北京)水资源与环境学院,北京100083

出　　处：《水文地质工程地质》2018年第4期15-20,共6页Hydrogeology & Engineering Geology

基　　金：国家重点基础发展973计划(2015CB452902)

摘　　要：LTC(Level,Temperature,Conductivity)水位仪是一种用来监测水位、水温和电导率的仪器,体积小和使用方便等特点使其广泛应用于地下水动态及海水入侵监测,但随着使用时间增长,其水压和盐度系统误差会增加,而这一误差却经常被忽略。通过一种简单有效的方法对52个LTC水位仪水压和盐度的测量进行系统误差检验与校正。统计分析表明,在一定条件下分别有71.2%和90.4%的LTC水位仪测量水压和盐度的误差超出了仪器本身精度。对于超出仪器本身精度的LTC水位仪进行系统误差校正,水压和盐度的真实值与测量值呈线性关系,不同LTC水位仪线性校正系数的值也不同。校正前水压和盐度的误差范围分别为-2.08~5.21 cm和-10.77~2.03 g/L,校正后误差范围分别为±1 cm和±1 g/L。测试结果表明,用LTC水位仪野外监测时,应事后进行水压和盐度系统误差的检验和校正,以保证和提高采集数据的质量。The LTC Levelogger Junior is one of the most small and convenience instruments in monitoring groundwater level,temperature and electrical conductivity.It is widely used in monitoring groundwater dynamics and seawater intrusion.The system error of water pressure and salinity will increase over time and is always ignored.In this paper,a simple and effective method is proposed to test and calibrate the system error of water pressure and salinity by using the 52 LTC Levelogger Juniors in laboratory.Statistical analyses indicate that almost 71.2%and 90.4%of the LTC Levelogger Juniors exceed the system accuracy when measuring water pressure and salinity,respectively.The system error is calibrated in this paper.It turns out to be a good linear relationship between the measured and actual values of pressure and salinity.Each LTC Levelogger Junior has different calibrated parameters.The system error of water pressure and salinity ranges from-2.08 cm to 5.21cm and from-10.77 g/L to 2.03 g/L,respectively,before calibration,but ranges from-1 cm to 1 cm and from-1 g/L to 1 g/L,respectively,after calibration.The results show that the LTC Levelogger after should be test and calibrated before applied in the field.

关 键 词：LTC水位仪 误差校正 盐度 水压 

分 类 号：P641.12[天文地球—地质矿产勘探]