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文章摘要

基于Landsat 8的沱沱河流域总氮和氨氮反演模型研究

Research on the Inversion Model of TN and NH3 N in Tuotuo River Basin Based on Landsat 8

DOI：

英文关键词: TN NH3 N Remote sensing image Inversion model Tuotuo River basin

基金项目:国家重点研发计划基金资助项目（2022YFC3204104)；青海省中央引导地方科技发展基金资助项目（2022ZY042）

作者	单位
谢朝阳	青海大学生态环境工程学院
牛海林	青海大学生态环境工程学院
宋玉庭	青海大学生态环境工程学院；中国科学院南京地理与湖泊研究所
徐力刚	中国科学院南京地理与湖泊研究所

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中文摘要:

将沱沱河流域2021年6—7月TN、NH3 N的实测值和Landsat 8影像的41种波段组合的反射率建立反演关系，筛选出拟合度较高的波段组合与实测值以线性、二次多项式、对数函数、指数函数和幂函数的方式建立反演模型。结果表明，Landsat 8影像的B4、B5、B6和B7波段反射率与TN、NH3 N值呈显著相关性；B4+B5+B7波段组合与TN值具有较高的拟合度，B6/B7与NH3 N值具有较高的拟合度。将2021年8月的遥感影像利用模型反演TN、NH3 N的预测值，并与实测值进行模型精度验证，TN值反演模型的MAE为1389%， RMSE为0152mg/L，NH3 N值反演模型的MAE为587%，RMSE为0077mg/L。

英文摘要:

The inversion relationship was established between the measured values of TN and NH3 N and the reflectivity of the images from Landsat 8 in 41 kinds of band combinations in Tuotuo River basin from June to July 2021. The inversion model was constructed in the form of linear， quadratic polynomial， logarithmic function， exponential function and power function by using selected band combinations with high degree of fit and measured values. The results showed that the reflectivity of the images from Landsat 8 in B4， B5， B6 and B7 bands was significantly correlated with TN and NH3 N values. The band combination of B4+B5+B7 had a high degree of fit with TN value， and B6/B7 had a high degree of fit with NH3 N value. The predicted values of TN and NH3 N from the remote sensing images in August 2021 by inversion model were compared with the measured values to verify the model accuracy. The MAE and RMSE of TN inversion model were 13.89% and 0.152 mg/L， respectively. The MAE and RMSE of NH3 N inversion model were 5.87% and 0.077 mg/L， respectively.

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