基于环境一号卫星的内陆水体水质多光谱遥感监测

基于环境一号卫星多光谱数据,针对我国内陆水体开展遥感监测研究。该研究建立分地区分季节经验模型反演叶绿素a浓度,基于生物光学模型的近红外单波段方法反演悬浮物浓度,以悬浮物浓度间接反演透明度,最终基于叶绿素a和悬浮物获得基于遥感监测的内陆水体营养状态指数。以2009年6月巢湖同步观测试验验证本文的水质参数反演算法,表明叶绿素a浓度反演精度不如悬浮物浓度,两者反演精度符合水环境监测业务需求。

Remote Sensing Monitoring on Water Quality of Interior Water Body Based on the HJ-1 Satellite Multi-spectral Data

The assessment of water eutrophication was performed based on the remote sensing retrieval of chlorophyll-a concentration and suspended sediment concentration (SSC)using HJ-1 satellite multi-spectrum data in order to support the quantitative application program of HJ-1 data and improve the environmental monitoring level of the domestic interior water body.Based on the analysis of HJ-1 technologic parameters,the seasonal chlorophyll-a concentration estimating model was chosen using HJ-1 CCD data,and SSC was inverted by semi-analytic model using near-infrared band data of HJ-1 CCD.Furthermore,the water transparency was indirectly inverted using the SSC results.Lastly,the water trophic state index was obtained using the retrieval results of chlorophyll-a concentration and transparency to assess the water eutrophication.Chaohu Lake was chosen as the test site.The water surface spectral measurement was performed at the 15 experiment sites in Chaohu Lake at the time of HJ-1 overpass on June 13 and 15,2009.At the same time,the atmospheric measurements were made to obtain the aerosol optical depth and the water samples were collected in situ to obtain the measured chlorophyll-a concentration and SSC.The HJ-1 CCD data of Chaohu Lake on June 15,2009 was chosen to retrieval chlorophyll-a concentration,SSC,transparency and water trophic state index after geometric precision correction and atmospheric correction.It was shown that the retrieval results of chlorophyll-a concentration and SSC were in good agreement with the measurements values.It was concluded that HJ-1 CCD data can be well applied in monitoring water eutrophication of interior water body.