基于TM/ETM^+影响分析巢湖叶绿素a浓度变化趋势  

Analysing developing trend of chlorophyll-a concentration in Chaohu Lake based on TM/ETM^+ image

作　　者：谢杰[1,2] 王心源[2,3] 张洁[2,4] 李伟[1] 

机构地区：[1]安徽师范大学环境科学与工程学院,安徽芜湖241003 [2]安徽遥感考古工作站,安徽芜湖241000 [3]中国科学院对地观测与数字地球科学中心,北京100190 [4]安徽师范大学国土资源与旅游学院,安徽芜湖241003

出　　处：《中国环境科学》2010年第5期677-682,共6页China Environmental Science

基　　金：安徽省高等学校省级自然科学研究重大项目(ZD200908);国家自然科学基金资助项目(40571162)

摘　　要：对1995～2007年6景巢湖地区TM/ETM+数据利用多暗像元法进行大气校正并利用修正归一化水体指数(MNDWI)进行水体信息提取,在此基础上,使用(TM2+TM4-TM3)/ln[TM3]模型提取了巢湖水体叶绿素a相对浓度信息.结果表明:高浓度区域主要分布在巢湖西半湖;南淝河水质情况对巢湖蓝藻暴发的贡献较大;1995～2006年间高浓度区域扩大了1.82倍,并有向巢湖东部扩展的趋势,富营养化程度仍在加剧.6 periods remote sensing data from 1995～2007 of Chaohu area were processed.The method of many dark pixels was adopted to carry out atmospheric modification and the modified normalized difference water index （MNDWI） was adopted to get the information of water.On this basis,the information of chlorophyll-a relative concentration in Chaohu Lake was extracted by the model of （TM2＋TM4-TM3）/ln[TM3].The area of high concentration was mainly distributed in the western of Chaohu Lake;The water quality of Nanfei River contributed more to algae bloom in Chaohu Lake;The area of high concentration increased by 1.82-fold from 1995 to 2006 and had tendency of expanding to the east of Chaohu Lake,with the degree of eutrophication still aggravating.

关 键 词：叶绿素A 遥感 相对浓度信息 变化分析 巢湖 

分 类 号：X87[环境科学与工程—环境工程]