京杭运河(苏州段)水质时空分布特征分析

本文基于数据分析工具Excel 2007和SPSS17.0,采用多元统计方法中的聚类分析与判别分析对2008年京杭运河(苏州段)水质时空分布特征进行分析,以识别水质指标的时间与空间差异性。时间分析结果将京杭运河(苏州段)划分为与丰、平、枯水期略有差异的3个时期,其中7项显著性时间差异的水质指标为pH、NH4-N、CODMn、DO、BOD5、V-phen、cn-total。空间分析结果将研究区域分为3个污染区域;空间分析判别函数的构建表明仅pH、NH4-N、CODMn、DO、BOD55项水质指标即可反映研究区域水质的差异性。本研究结果对改善省界河流水质、缓解省际纠纷、维护社会和谐稳定具有重要意义。

Evaluation of Spatial and Temporal Distribution of Water Quality in Grand Canal

Based on Excel2007 and SPSS17.0,multivariate statistical techniques such as cluster analysis（CA） and discriminant analysis（DA） were applied to evaluate the spatial and temporal variations of water quality at Suzhou section in Grand Canal,aiming at identifying the spatial and temporal differences between sampling stations.According to the temporal analysis result,the indexes of water quality were classified into three periods with different water flow rates,of which seven ones,i.e.,pH,NH4-N,CODMn,DO,BOD5,V-phen and cn-total,appear temporal difference significantly.According to the partial analysis result,the area concerned was classified into three pollution parts.The structure of discriminant function showed that only five indexes of water quality,i.e.,pH,NH4-N,CODMn,DO and BOD5 reflected the differences in this area.The results of the study are meaningful to improve the water quality of provincial boundary,remit the inter province water disputes and maintain the social harmonious stability.