大气与环境光学学报2024，Vol.19Issue(4)：468-478,11.DOI:10.3969/j.issn.1673-6141.2024.04.007
基于实测光谱的白洋淀叶绿素a浓度反演
Inversion of chlorophyll a concentration in Baiyangdian Lake based on measured spectra
摘要
Abstract
The concentration of chlorophyll a in inland water determines the plankton content,which is a main index to measure the eutrophication degree of water,and is also one of the important factors affecting the apparent reflectance spectrum of water.The three-band bio-optical model can effectively reduce the influence of suspended matter and chemical substances in Class Ⅱ water during the inversion process and accurately estimate the concentration of chlorophyll a.Taking Baiyangdian Lake in Xiongan New Area,China,as the research area,the spectral characteristics of water were analyzed by using the measured water spectrum and chlorophyll a concentration,the position of three-band factors was determined by using the exhaustive method,the three-band inversion model was established and the accuracy was verified,and finally the results wreanalyzed and evaluated.The results show that at λ1=673 nm,λ2=729 nm,λ3=782 nm,the maximum correlation coefficient between the inversion factors of the three-band model[Rrs-1(673)-Rrs-1(729)]Rrs(782)and chlorophyll aconcentration is 0.82.The determination coefficient,root mean square error,mean absolute error and mean relative error of the model are 0.67,3.61 μg/L,2.86 μg/L and 26.06％,respectively,indicating that for the water with high suspended matter and chemical substances,the three-band model has a good inversion accuracy compared with the wave segment ratio and single-band model.This study provides a certain theoretical basis and technical support for the inversion of chlorophyll a concentration in Baiyangdian Lake,which is helpful for the continuous monitoring of water quality in Baiyangdian Lake,and also provides an algorithmic support for the inversion of chlorophyll a concentration in Class Ⅱ water using three-band model in the future.关键词
实测光谱/三波段模型/叶绿素a浓度反演/水质检测Key words
measured spectrum/three-band model/chlorophyll a concentration inversion/water quality detection分类
农业科技引用本文复制引用
张圣昊,赵起超,韩宝辉,曹淑钧,赵雪纯,雷骁..基于实测光谱的白洋淀叶绿素a浓度反演[J].大气与环境光学学报,2024,19(4):468-478,11.基金项目
中国高分辨率对地观测工程(30-Y30F06-9003-20/22),河北省引进拔尖人才科研项目(2020-HB-QZYC002) （30-Y30F06-9003-20/22）
