基于环境一号卫星CCD数据的洞庭湖夏季富营养状态评价

利用环境一号卫星数据,系统地分析洞庭湖富营养状态的年际时空变化特征.通过星地同步地面实验,建立起洞庭湖水体的叶绿素a浓度遥感反演模型、富营养状态评价模型.利用2009到2013年8月的多期环境一号卫星CCD数据,对洞庭湖富营养状态进行动态监测和分析.结果表明:1洞庭湖区主要以中营养为主.2009到2013年富营养化水体占全湖的面积分别为48.57%、63.84%、51.10%、35.27%、52.10%.2010年富营养化水体占全湖面积比最大,其次是2013年.2洞庭湖富营养水体主要集中在大小西湖、东洞庭湖西部及内湖地区.2009年到2013年大通湖和南湖这两个典型内湖重度富营养水体占全湖的面积比都在逐年下降,水质有好转的趋势.

Eutrophication assessment of Dongting Lake in summer based on HJ-1 CCD data

The interannual spatial and temporal variation of eutrophication in Dongting Lake was systematically analyzed based on HJ-1 CCD data in this paper.Chlorophyll-a concentration remote sensing inversion model and eutrophication assessment model were built through satellite-ground synchronization ground test.Eutrophication in Dongting Lake was dynamically monitored and evaluated using HJ-1 CCD data from 2009 to August 2013.The results showed:1 water quality of Dongting lake was mainly in mesotrophication level.The eutrophic water area was 48.57%,63.84%, 51.10%,35.27% and 52.10% of the whole lake area every year from 2009 to 2013,respectively.The largest ratio was in 2010,followed by 2013.2 Eutrophic water was concentrated mainly in Daxi Lake,Xiaoxi Lake,Earth Dongting Lake and Inner Lake.The area ratio of eutrophic water in Datong Lake and Nan Lake,two typical inner lakes,decreased by year,which indicated that the water quality in these areas has been improved.