基于Landsat-8数据的博斯腾湖透明度反演

Estimation of Water Clarity Based on Landsat-8 data in Lake Bosten

透明度是湖泊水体重要的物理参数之一,是水体光学组分的综合反映,对研究湖泊生态环境具有重要科学意义。目前,利用遥感技术手段对博斯腾湖进行大范围、连续的水透明度监测研究相对较少。基于湖泊透明度实测值、对应点的光谱数据和Landsat-8遥感影像,分析透明度敏感波段及其组合,建立博斯腾湖水体透明度遥感反演模型。实测光谱分析结果显示波段比值运算和和差组合运算的敏感性较高,相关系数可达0.8以上;Landsat-8 OLI遥感数据分析结果得到波段比值(近红外波段和蓝色波段的比值)的敏感性较高,相关系数可达0.7;基于OLI近红外波段B5和蓝色波段B1比值的线性模型反演效果最好,精度较高,且稳定性较好。博斯腾湖透明度在200 cm左右,透明度由西向东先升高再降低,呈带状分布。

Water clarity is one of the valuable physical parameters in the lake environment,which is an integrative reflection of optical components in water,has great scientific and practical significance to lake ecological environment research.Study on the retrieval of water clarity in Lake Bosten by remote sensing was insufficient at present.The correlations of band and band combination were analyzed,and estimation model of water clarity were established based on the in situ data in 2016(17 sites),the corresponding spectral data,and Landsat-8 data.The analyzing results of spectral data indicated that the correlation coefficient of sum,difference,and ratio operations between bands reached 0.8.The results of OLI data analysis showed that the band ratios were better,and the correlation coefficient was more than 0.7.The linear model with band 5 and band 1 of Landsat-8 OLI data was the best model.The water clarity of Lake Bosten was around 200 cm;and it increased first and then decreased from west to east and had a zonal distribution.