摘要
在石油类污染水体中,通过遥感技术获取的遥感反射率(Remote sensing reflectance,R_(rs))主要是油(石油类物质)、沙(悬浮泥沙)和藻(叶绿素)三种水体组分共同贡献的结果。基于现有的油藻混合水体R_(rs)光谱的研究基础,本文通过添加悬浮泥沙组分,进一步研究油沙藻混合水体R_(rs)光谱变化特征,旨在提高基于R_(rs)所建立的石油类污染浓度C_(oil)遥感反演模型的精度。将2018年8月25—27日在辽宁省大连港海域针对石油类污染水体所测量的现场数据作为输入参数,采用浓度配比方式,基于辐射传输模型Hydrolight对R_(rs)光谱数据进行模拟,并对纯沙、油沙、油沙藻等不同组合水体的R_(rs)光谱变化特征展开分析。结果表明:(1)在纯沙单组分水体中,不同浓度的R_(rs)在440 nm处出现了交汇,交汇处前后R_(rs)的光谱变化在量级和形状上有明显的差异;(2)在油沙双组分混合水体中,R_(rs)的峰值随着悬浮泥沙浓度C_(spm)的增加逐渐增大,并往长波方向移动,逐渐反映为悬浮泥沙的光谱特性,且在C_(spm)较高的情况下,R_(rs)随波长λ的变化在550~600 nm之间呈现出一个峰值,随着C_(oil)的增加R_(rs)的峰值随之下降,但光谱形状变化不大;(3)在油沙藻三组分混合水体中,R_(rs)的量值存在随着C_(spm)的增加而逐渐增大,但随着C_(chl)的增加而逐渐下降的现象;当C_(oil)>1.0 mg/L时油类物质对R_(rs)光谱的影响开始显现出来,这种影响主要表现在R_(rs)的量值,光谱形状变化不大,这表明油类物质对R_(rs)的影响主要是通过附着在沙(悬浮泥沙)和藻(叶绿素)之上的方式而进行的。
In petroleum-polluted water bodies,the remote sensing reflectance(R_(rs))obtained with remote sensing technology is mainly contributed jointly by three water body components,oil(petroleum substances),sands(suspended sediment)and algae(chlorophyll).In this study,we studied the existing data of R_(rs)spectral variation characteristics of water with oil and algae mixture.By adding suspended sediment components,we further studied the R_(rs)spectral variation characteristics of water with petroleum substances,suspended sediments and algae mixture.These studies were carried out,aiming to improve the accuracy of the C_(oil)remote sensing inversion model of various petroleum pollution concentrations based on R_(rs),and lay a foundation for the studies of the radiation transmission characteristics of oil-contaminated water bodies.The field data of petroleum-contaminated water bodies collected in the sea area around Dalian Port,Liaoning Province,from Aug.25 to 27,2018 were taken as the input parameters,and different concentrations of oil,sands and algae were used.We used the radiation transfer model Hydrolight to simulate R_(rs)of the single component and mixed water of different components with oil,sands and algae with concentration proportioning method.The R_(rs)spectral data of different water bodies,such as pure sands,oil and sands,and oil,sands and algae,were analyzed.In water body with pure sands as the single component,the R_(rs)of different concentrations appeared to meet at 440 nm and the spectral changes of R_(rs)before and after the intersection was obviously different in magnitude and shape.In water body with oil and sands mixture,the peak value of R_(rs)gradually increased with the increase of suspended sediment concentration C_(spm),and moved in long-wave direction,gradually reflecting as the spectral characteristics of suspended sediments.In the case of high C_(spm),the R_(rs)showed a peak value between 550-600 nm as a function of wavelengthλ.With the increase of C_(oil),the peak value of R_(rs)decreased,but the spectral shape did not change that much.In the water with three components of oil,sand and algae,the amount of R_(rs)increased gradually with the increase of C_(spm),but decreased gradually with the increase of C_(chl).When C_(oil)>1.0 mg/L,the influence of oil on the R_(rs)spectrum appeared,which was mainly manifested by the magnitude of R_(rs).The shape of the spectrum changed little,It was indicated that the influence of oil on R_(rs)is mainly carried out by attaching to the sands(suspended sediments)and algae(their chlorophyll).
作者
黄妙芬
骆蔚健
邢旭峰
刘杨
张楠楠
HUANG Miaofen;LUO Weijian;XING Xufeng;LIU Yang;ZHANG Nannan(Faculty of Mathematics and Computer Science,Guangdong Ocean University,Zhanjiang,Guangdong 524088,China;College of Oceanography and Meteorology,Guangdong Ocean University,Zhanjiang,Guangdong 524088,China;PetroChina exploration and development research institute,Beijing 100083,China)
出处
《海洋湖沼通报》
CSCD
北大核心
2022年第6期14-22,共9页
Transactions of Oceanology and Limnology
基金
国家自然科学基金项目(41771384)
国家重点研发计划重点专项资助项目(2016YFC1401203)
