CAJ | 학술논문

为了解洞庭湖区枯水期的水体总磷的污染情况，利用MODIS反射率与同步的总磷（ TP）浓度实测数据进行相关性分析，得出最优波段组合b1-b5。建立了三次多项式反演模型，并运用模型反演得到2005、2009及2013年枯水期3期洞庭湖区总磷的分布图，湖区水体主要以Ⅳ类水质和Ⅴ类水质为主，进一步采用以TP为基准的修正营养指数（ TSIM ）公式得出洞庭湖区的营养状态分布情况。结果表明：2005-2013年洞庭湖水体营养指数呈现略下降又上升的趋势。洞庭湖区湖水趋于富营养化状态，且东洞庭湖最严重，南洞庭湖次之，西洞庭湖最轻，洞庭湖湖体水质劣于入湖口水质。
위료해동정호구고수기적수체총린적오염정황，이용MODIS반사솔여동보적총린（ TP）농도실측수거진행상관성분석，득출최우파단조합b1-b5。건립료삼차다항식반연모형，병운용모형반연득도2005、2009급2013년고수기3기동정호구총린적분포도，호구수체주요이Ⅳ류수질화Ⅴ류수질위주，진일보채용이TP위기준적수정영양지수（ TSIM ）공식득출동정호구적영양상태분포정황。결과표명：2005-2013년동정호수체영양지수정현략하강우상승적추세。동정호구호수추우부영양화상태，차동동정호최엄중，남동정호차지，서동정호최경，동정호호체수질렬우입호구수질。
In order to understand the status of TP pollution of water body in Dongting Lake in dry season , the paper used the ( MODIS) data and measured TP data to conducted correlation analysis .The research indicated that the best band combination is b1 -b5 .The paper set up a cubic polynomial model for re-trieval of TP concentration .Furthermore , It obtained TP concentration map at Dongting lake area in 2005 , 2009 and 2013 by use of model retrieval .Results showed that TP concentration in most area of Dongting Lake belong to class Ⅳand classⅤ.Finally, the trophic state index model ( TSIM ) was used to make eutrophication map of Dongting lake .Results suggest that the nutritional status of Dongting lake tends to eutrophication .The trophic index of water body in Dongting Lake dropped slightly and then rose from 2005 to 2013 .The most serious area of eutrophication is the east of Dongting Lake , then the south of Dongting Lake , the west of Dongting Lake is relatively the best one .The water quality in inner lake are inferior to that near the outlets of four tributaries .