COD_(Mn)入海通量长时序演变:瓯江遥感影像光谱信息反演  

Long-term changes of COD_(Mn)flux into the sea:Retrieval of spectral information from remote sensing images of Oujiang River

作　　者：刘悦宁 龚芳[2,3] 何贤强 金旭晨 LIU Yuening;GONG Fang;HE Xianqiang;JIN Xuchen(Ocean College,Zhejiang University,Zhoushan 316021,China;State Key Laboratory of Satellite Ocean Environment Dynamics,Hangzhou 310012,China;Second Institute of Oceanography,MNR,Hangzhou 310012,China)

机构地区：[1]浙江大学海洋学院,浙江舟山316021 [2]卫星海洋环境动力学国家重点实验室,浙江杭州310012 [3]自然资源部第二海洋研究所,浙江杭州310012

出　　处：《海洋学研究》2023年第1期45-54,共10页Journal of Marine Sciences

基　　金：浙江省“尖兵”“领雁”研发攻关计划项目(2023C03011);浙江省自然科学基金资助项目(DT23D060008)。

摘　　要：瓯江作为浙江省第二大入海河流,每年约有200亿m^(3)水体输入东海。为探究瓯江高锰酸盐指数(COD_(Mn))的入海通量及其长时序变化特征,该文基于实测数据与Landsat-8遥感影像光谱信息之间的相关性,构建了瓯江COD_(Mn)遥感反演模型(平均相对误差为28%),获得了1986—2020年瓯江中下游河段COD_(Mn)反演结果。此外,进一步结合降水数据估算了瓯江入海径流量和COD_(Mn)入海通量,实现了瓯江COD_(Mn)入海通量长时序变化遥感监测。结果表明,瓯江入海段COD_(Mn)干、湿季差异并不明显,但总体而言,COD_(Mn)在湿季略高于干季;1986—2020年,瓯江COD_(Mn)入海通量整体波动较大,略呈下降趋势。As the second largest river in Zhejiang Province,Oujiang River has about 20 billion cubic meters of water flowing into the East China Sea every year.In order to explore the COD_(Mn)flux of Oujiang River into the sea and its characteristics of long-term changes based on the correlation between the measured data and the spectral information of Landsat-8 remote sensing image,the Oujiang River COD_(Mn)remote sensing inversion model was constructed(the average relative error is 28%)and the inversion results of COD_(Mn)in the middle and lower reaches of Oujiang River in 1986-2020 were obtained.In addition,based on rainfall data,the runoff and COD_(Mn)flux into the sea was further estimated and then remote sensing monitoring of long-term changes of Oujiang COD_(Mn)flux into the sea was realized.The results show that the difference of COD_(Mn)between dry and wet seasons in the Oujiang River Estuary is not obvious,but in general,the COD_(Mn)in wet season was slightly higher than that in dry season.From 1986 to 2020,the COD_(Mn)flux of Oujiang River into the sea fluctuated greatly,with a slight downward trend.

关 键 词：瓯江 COD_(Mn) 入海通量 卫星遥感 变化趋势 

分 类 号：P734[天文地球—海洋化学] TP79[天文地球—海洋科学]