利用Landsat 8 OLI进行汉江下游水体浊度反演

Inland Riverine Turbidity Estimation for Hanjiang River with Landsat 8 OLI Imager

  • 摘要: 综合比较Landsat 8 OLI遥感影像与地面同步水质监测结果,发现Landsat 8的近红外波段与其他波段的组合和水体浊度具有较高的相关性,以此为基础运用OLI的第1、3、5波段组合建立了汉江中下游浊度的遥感反演数学模型。根据该模型生成了2013年4~11月共3幅汉江中下游浊度分布图,并进行了空间分析。精度验证表明,模型相对误差在15%左右,R2=0.71,表明运用Landsat 8 OLI可有效地监测该区域水体浊度分布情况。

     

    Abstract: This research investigated the Landsat 8 Operational Land Imager (OLI) performance in monitoring dynamic riverine turbidity in a case study of he Hanjiang River in China, the largest tributary of the Yangtze River. Field surveys conducted between April and November 2013 showed a wide range of turbidity (15.8~54.4 NTU). A practical exponential retrieval algorithm used in conjunction with the OLI bands1, 3 and 5 on the Landsat 8 was developed to assess compatibility between satellite remote sensing reflectance and in-situ measured data. Results obtained for the whole area accurately matched the in-situ data at most stations (R2=0.71, MAPE=15.44%) during the validation phase. It was found that Landsat 8 OLI imagery can be used to estimate turbidity in inland riverine systems when a suitable retrieval algorithm is applied.

     

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