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湖泊科学  2007 

分季节的太湖悬浮物遥感估测模型研究

DOI: 10.18307/2007.0303

Keywords: 悬浮物,分季节模型,遥感,实测光谱,太湖

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Abstract:

根据1996-2002年无锡太湖监测站的水质资料分析,太湖悬浮物具有季节性特征,因而分季节的悬浮物估测模型比单一的模型可能更加适合用来估测太湖全年的悬浮物浓度。在分析太湖水体光谱特征的基础上,根据太湖悬浮物的季节性分布特征,使用春夏秋冬四季的LandsatTM/ETM图像和准同步的水质采样数据,建立了太湖分季节的悬浮物估算模型。结果表明:估测因子(B2+B3)/(B2/B3)在舂、秋、冬三季都能很好地估测出悬浮物的浓度(R2>0.52)。夏季由于叶绿素的干扰性较大,悬浮物的估测效果不理想。冬季的估测效果最好(R2=0.81),模型为lnSS=14.656×(B2+B3)/(B2/B3)+1.661,其中,lnSS表示悬浮物取自然对数后的值,B2、B3为TM/ETM图像经过6S大气校正、3×3低通滤波后第2、3波段的反射率值。

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