基于Landsat8数据的巢湖悬浮物浓度分析

Application of Suspended Solids Concentration in the Chaohu Lake Based on the Landsat8 Image

利用4景Landsat8数据,以巢湖为研究对象,获得2013-05-12巢湖悬浮物的质量浓度特征。利用Landsat8新增的卷云波段有效剔除卷云对遥感带来的干扰。通过MNDWI指数提取水体信息,对深蓝波段与蓝光波段进行归一化指数计算,然后进行密度分割得到悬浮物浓度分级图,分析其空间变化。

Taking Chaohu Lake as study area, we got the concentration of suspended solids in Chaohu Lake in May 2013 to December based on the four scene satellite data of Landsat 8. We used the addition of the cirrus band to effectively eliminate strong reflection on the remote sensing brought by cirrus clouds, which reflect the sun's radiation. We extracted water body information based on the MNDWI index, and made suspended solids concentration classification figure by calculating the normalized index of deep blue band and blue band and density slicing. Through analysis of statistical data, we researched the spatial variation of suspended solids in Chaohu Lake existed objective. The results show that ① the addition of the deep blue band can be useful for monitoring suspended materials in open waters; ② suspended solids concentration in Chaohu shows seasonal characteristics; ③ the suspended solids concentration of river mouth into the lake is high; ④ influenced by urban climate and economic activity, the suspended solids concentration of northern Chaohu is overall high.