CAJ | 학술논문

为了研究长江水系的水质情况及发展趋势，根据其103个国控断面2006－2010年8项水质监测指标数据（共计515组样本）和地下水质量评价标准，建立了水质综合评价的投影寻踪（ PPC）模型。研究结果表明：长江水系国控断面上整体水质较好，其中I类和Ⅱ类水质分别占60％和22．7％；上游水质总体上好于下游水质；化工工业较发达地区的支流和河流水污染情况严重，2006－2009年，水质逐年改善，但2010年水质最差。研究了不同投影窗口半径R值对PPC建模结果的影响规律，理论和实证研究表明， R ＝0．1 Sz的较小值方案是不合理的，rmax≤R≤2p的较大值方案是错误的，R不宜取常数，只有rmax／5≤R≤rmax／3的中间适度值方案是合理的。
위료연구장강수계적수질정황급발전추세，근거기103개국공단면2006－2010년8항수질감측지표수거（공계515조양본）화지하수질량평개표준，건립료수질종합평개적투영심종（ PPC）모형。연구결과표명：장강수계국공단면상정체수질교호，기중I류화Ⅱ류수질분별점60％화22．7％；상유수질총체상호우하유수질；화공공업교발체지구적지류화하류수오염정황엄중，2006－2009년，수질축년개선，단2010년수질최차。연구료불동투영창구반경R치대PPC건모결과적영향규률，이론화실증연구표명， R ＝0．1 Sz적교소치방안시불합리적，rmax≤R≤2p적교대치방안시착오적，R불의취상수，지유rmax／5≤R≤rmax／3적중간괄도치방안시합리적。
In order to study the water quality and its changing trend of the Yangtze river ( YR) and ac-cording to the eight-index measured data on 103 government-control sections of YR from 2006 to 2010 ( total 515 samples ) and the standards of quality evaluation of groundwater ,the paper established the pro-jection pursuit clustering model of comprehensive evaluation of water quality .The results show that the water quality on the control sections is quite good , the water quality of type I and Ⅱ take up 60%and 22 .7%respectively .The water quality in upperstream is better than that in downstream .The water pol-lution is quite serious in the Chemical-industry developed areas .From 2006 to 2009 , the water quality was gradually improved year by year ,and was the worst in 2010 .The paper researched the rule of influ-ence of cutoff radius R value ( CRRV) on the results of PPC model .The theory analysis show that the scheme of taking the smaller CRRV ( R =0.1 Sz ) is absolutely unreasonable , the larger CRRV ( rmax≤R≤2p) is error, should not be the constant , and only the moderate-suitable value of CRRV (rmax/5≤R≤rmax/3) is reasonable correct .