摘要
作为长江最大的通江湖泊,鄱阳湖水生态安全影响着整个长江流域。叶绿素a浓度是水生态富营养化的重要指标,利用遥感技术开展叶绿素a浓度常规监测具有重要意义。以鄱阳湖为试验区,以表征富营养化程度的叶绿素a浓度为反演指标,基于2015—2020年6 a的观测数据以及Landsat系列影像,在规范建模时相以及“星-地”协同匹配的情况下,通过分析对比不同波段与叶绿素a浓度的相关指数,构建了适用于夏季鄱阳湖水体叶绿素a浓度反演模型。经6组独立数据验证后R 2均值为0.86,RMSE均值为1.01μg/L,MAPE均值为17.6%,认为所采用的方法可以较好地适用于鄱阳湖区夏季(丰水期)叶绿素a浓度的的反演,同时也为具备长期观测条件下内陆二类水体叶绿素a浓度监测提供了新的参考方法。
Poyang Lake,situated in north-central Jiangxi Province,is the largest freshwater lake in China and connects to the Yangtze River.Given its size and location,the lake’s water ecological security profoundly impacts the entire Yangtze River basin.Chlorophyll-a concentration serves as a crucial indicator of water ecological eutrophication,underscoring the importance of routine remote sensing monitoring.This study focuses on Poyang Lake,using chlorophyll-a as a proxy for eutrophication.By analyzing six years of observation data(2015-2020)and LandSat images,a retrieval model for summer chlorophyll-a concentration in Poyang Lake was developed.This model employs standard modeling techniques and ensures“satellite-ground”coordination to accurately match data.Through correlation analysis between various wavelength bands and chlorophyll-a concentration,the study constructs a robust retrieval model.Verification with six independent datasets yielded a mean R 2 value of 0.86,RMSE of 1.01μg/L,and MAPE of 17.6%.These results validate the efficacy of the method for chlorophyll-a retrieval in Poyang Lake and suggest its potential application as a reference for long-term monitoring of chlorophyll-a in similar inland Class II water bodies.
作者
郑璞
许新发
许小华
陈鑫雨
张任高
ZHENG Pu;XU Xin-fa;XU Xiao-hua;CHEN Xin-yu;ZHANG Ren-gao(Jiangxi Academy of Water Science and Engineering,Nanchang 330029,China;Jiangxi Provincial Technology Innovation Center for Ecological Water Engineering in Poyang Lake Basin,Nanchang 330029,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China;School of Surveyingand Mapping Engineering,East China University of Technology,Nanchang 330013,China)
出处
《长江科学院院报》
CSCD
北大核心
2024年第7期48-56,共9页
Journal of Changjiang River Scientific Research Institute
基金
江西省科技厅重大科技研发专项(20213AAG01012)
江西省科技厅重点研发计划项目(20212BBG71008)。
关键词
遥感反演
鄱阳湖
叶绿素A
相关性分析
remote sensing
Poyang lake
chlorophyll-a
correlation analysis
