基于反距离加权插值法评价海域水质类别空间分布  

Assessment of Seawater Quality Spatial Distribution Based on Inverse Distance Weighted Interpolation

作　　者：李翔宇[1] 李曌[2] 包艳英[1] 李利[3] 李玉璞[1] LI Xiangyu;LI Zhao;BAO Yanying;LI Li;LI Yupu(Dalian Environmental Monitoring Centre,Dalian 116023,China;State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring,China National Environmental Monitoring Centre,Beijing 100012,China;Department of Information system,Dalian Naval Academy,Dalian 116018,China)

机构地区：[1]大连市环境监测中心,辽宁大连116023 [2]中国环境监测总站,国家环境保护环境监测质量控制重点实验室,北京100012 [3]海军大连舰艇学院,信息系统系,辽宁大连116018

出　　处：《中国环境监测》2019年第6期70-77,共8页Environmental Monitoring in China

摘　　要：空间插值技术可以对污染物分布状况进行面状连续表征,是对点位法评价的有效补充。笔者根据现行海水水质评价方法,类比给出近岸海域水质类别空间分布评价的流程:单指标空间插值-单指标水质分类-多指标水质类别判定。研究了反距离加权插值参数的选取方法,并以点位密度不同的全国近岸海域(开放型)和渤海海域(近封闭型)为例进行了插值实验。结果表明:对目前的点位分布情况而言,全国近岸海域参数设为p=3,N=4,C=200m较为适宜;渤海海域参数为p=2,N=5,C=200m较为适宜。反距离加权插值法在开放海域的拟合效果要优于近封闭海域。Spatial interpolation technology can perform continuous surface characterization of pollutant distribution,which is an effective supplement to point assessment.According to the single-factor index,the paper provides a process of spatial distribution assessment of seawater quality classification:Single-factor interpolation,single-factor classification,class determination with multiple elements.It is focused on how to set the parameters of inverse distance weighted(IDW)interpolation and takes the open and near-closed sea area as example.Based on the current point distribution,it is suitable for China coastal sea that the parameters are set to p=3,N=4,C=200m.And it is suitable for the Bohai Sea that the parameters are set to p=2,N=5,C=200m.IDW interpolation result is better in the open sea area than the near-closed sea area.

关 键 词：反距离加权插值 海水水质 类别评价 参数设置 空间分布 

分 类 号：X824[环境科学与工程—环境工程]