摘要
黄色物质是水色遥感三要素之一,其生化保守性可很好地反映污染物的输运过程,近海二类水体黄色物质固有光学特性一直是国内外研究热点。湛江港湾是天然的深水港口,受港口运输业、近海钢铁、石化工业、城市生活及污水排放的影响,近年富营养化严重,港湾水质常呈四类甚至劣四类,研究该海域水体黄色物质光学特性对于研究二类水体固有光学特性及遥感探测均有重要意义。2017年5月开展了湛江湾海域黄色物质等要素调查研究,结果表明春季湛江港湾内a_g(355)在0.69~2.3 m^(-1)内,呈现由北向南、由西向东递减的趋势,光谱斜率S_(275~295)分布在16.15×10^(-3_^20.16×10^(-3)nm^(-1)范围,水平空间上大致呈现斑点状的分布,且表现为典型的陆源输入为主的来源特征。基于landsat-8 OLI波段,利用波段比值法构建了湛江港湾黄色物质反演模型,其相关系数可达到0.84,表明基于Landsat-8 OLI等卫星开展近海港湾黄色物质的遥感探测具有较高可行性。
Yellow substance, namely coloured dissolved organic matter（CDOM）, is one of the three elements of water color remote sensing. Its biochemical conservation can well reflect the transport process of pollutants. The inherent optical properties of CDOM in CASE Ⅱ waters have always been the hot topics both at home and abroad. Zhanjiang Harbor is a natural deep-water port. Affected by busy port transportation, offshore steel and iron production, petrochemical industries, urban life and sewage discharges, Zhanjiang Harbor is characterized by serious eutrophication in recent years. The water quality is rating at four or inferior four category frequently. It is of great significance to study the CDOM optical properties of waters in this area for better understanding the intrinsic optical properties and the detection of remote sensing. A survey on CDOM and other elements of the Zhanjiang Bay was conducted in May 2017, which indicated that the variation range for ag（355） in Zhanjiang Bay waters in spring is at 0.69-2.3 m^-1, showing a decreasing trend from north to south and from west to east. The variation range of S275-295 value is at 16.15×10^-3-20.16×10^-3 nm^-1, the distribution of the horizontal space of CDOM is roughly speckled, characteristic of coming from typical land source. Based on landsat-8 OLI band characteristics, the CDOM retrieval model of Zhanjiang Harbor is constructed through the band-ratio method, and the correlation coefficient can reach 0.84. The research indicates that the remote sensing method has high reliability based on Landsat-8 satellite CDOM for offshore harbors.
作者
廖珊
余果
付东洋
张小龙
王文芳
董昭顷
LIAO Shan1, YU guo1,2, FU Dong-yang1, ZHANG Xiao-long1,2, WANG Wen-fang1,DONG Zhao-qing1(1. College of Electronic and Information Engineering, GuangdongOcean University, Zhanjiang 524088, Guangdong Province, China;2. College of Oceanography and Meteorology, Guangdong Ocean University, Zhanjiang 524088, Guangdong Province, Chin)
出处
《海洋技术学报》
2018年第2期56-62,共7页
Journal of Ocean Technology
基金
国家海洋公益性科研专项资助项目(201305019)
广东省自然科学基金资助项目(2014A030313603)
广东省科技计划资助项目(2013B030200002
2016A020222016)
广东海洋大学创新强校项目(GDOU2014050226)
广东海洋大学大学生创新创业训练计划资助项目(CXXL2017026)
"海之帆"起航计划大学生科技创新培育项目(qhjh2017zr15)
关键词
湛江湾
黄色物质
吸收系数
光谱斜率
海洋遥感
Zhanjiang Bay
yellow substance
absorption coefficient
spectral slope
ocean remote sensing
