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研究背景海洋漂浮碎片是全球海洋环境治理中的重要污染问题。其在海面长期迁移和聚集,不仅威胁海洋生物与生态系统健康,也可能影响航运安全和近岸经济活动。由于漂浮碎片分布范围广、时空变化快,传统人工巡查、船舶观测和现场拍摄难以满足大范围、快速化监测需求。遥感技术为其监测提供了新路径,但不同材质碎片的光谱特征差异明显,且容易与背景海水和大型漂浮藻类混淆,限制了遥感识别的准确性与稳定性。基于此,南京信息工程大学孙德勇老师团队从多类型漂浮碎片的高光谱响应特征入手,结合卫星影像,构建了面向海洋漂浮碎片快速识别的遥感检测方法,为海洋污染监测、漂浮垃圾识别及海洋环境管理提供了新的技术支撑。相关成果发表在《Ecological Indicators》期刊。 图1. (a) 实验设备设计图;(b) 实验设备实物图;(c)-(y) 覆盖率。研究方法(1)研究设计:选取泡沫板、PVC浮标、PP塑料瓶和木板四类典型海洋漂浮碎片,利用ASD FieldSpec地物光谱仪开展室内控制实验,获取不同材质碎片及背景水体的高光谱反射特征;配置含海盐、叶绿素a和悬浮泥沙的模拟海水背景,并调控漂浮碎片在水面的覆盖比例,分析不同覆盖度下漂浮碎片的光谱响应变化;(2)数据分析及应用验证:在实测光谱基础上,研究利用混合光谱模型模拟不同覆盖度下的水面反射特征,并进一步构建漂浮碎片识别方法。随后,研究将该方法应用于温州近海、中沙群岛附近海域和杭州湾三个典型场景,验证其在不同水体环境下的适用性; 图2.不同覆盖度下,附着各类漂浮碎屑的水面混合Rrs(λ) 光谱:(a)泡沫板,(b) PVC浮标,(c) PP 瓶,(d)木板。 图3.漂浮碎屑、背景水体及大型漂浮藻类的DSI1直方图(a)和箱线图(b)。在图(a)中,左、右纵轴分别对应漂浮碎屑和大型漂浮藻类。 图4.漂浮碎屑和大型漂浮藻类的DSI2直方图(a)和箱线图(b)。图5....
发布时间: 2026 - 06 - 08
浏览次数:2
UNSW researchers have used a new water-tracing technology in the Sydney Basin for the first time to determine how groundwater moves in the different layers of rock below the surface.新南威尔士大学(UNSW)研究人员在悉尼盆地首次应用新的水源示踪技术监测地表下不同岩层下的地下水运动 http://newsroom.unsw.edu.au/news/science-tech/new-water-tracing-technology-help-protect-sydney-basin-groundwater
发布时间: 2016 - 01 - 15
浏览次数:158
LGR的二氧化碳同位素分析仪帮助中国科学院的科学家监测“新鲜有机物的质量对土壤有机物的启动和微生物底物利用率模式的影响” Quality of fresh organic matter affects priming of soil organic matter and substrate utilization patterns of microbesHui Wang1, 2 , Thomas W. Boutton3 , Wenhua Xu1 , Guoqing Hu1, 2 , Ping Jiang1 , Edith Bai1 AbstractChanges in biogeochemical cycles and the climate system due to human activities are expected to change the quantity and quality of plant litter inputs to soils. How changing quality of fresh organic matter (FOM) might influence the priming effect (PE) o...
发布时间: 2015 - 10 - 16
浏览次数:225
Rapid, Online Quantification of H2S in JP-8 Fuel Reformate Using Near-Infrared Cavity-Enhanced Laser Absorption Spectroscopy应用LGR激光痕量气体分析仪快速在线量化JP-8(特级航空材料)中的H2SFeng Dong†, Christian Junaedi‡, Subir Roychoudhury‡, and Manish Gupta*†† Los Gatos Research, 67 East Evelyn Avenue, Suite 3, Mountain View, California 94041, United States‡ Precision Combustion, Inc., 410 Sackett Point Road, North Haven, Connecticut 06473, United StatesAnal. Chem., 2011, 83 (11), pp 4132–4136DOI: 10.1021/ac200300tPublication Date (Web): May 3, 2011Copyright © 2011 American Chemical SocietyAbstractOn...
发布时间: 2015 - 10 - 10
浏览次数:252
Ecosystem carbon (CO2 and CH4) fluxes of a Populus dettoides plantationin subtropical China during and post clear-cutting Shenghua Gao a, Jiquan Chen b, Yuxi Tang c, Jing Xie d, Rui Zhang e, Jie Tang c, Xudong Zhang a,*a State Key Laboratory of Tree Genetics and Breeding, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, Chinab Center for Global Change and Earth Observations (CGCEO) and Department of Geography, Michigan State University, East Lansing, MI 48823, USAc Hunan Academy of Forestry, Chang...
发布时间: 2015 - 09 - 15
浏览次数:217
HYPERSPECTRAL REMOTE SENSING FOR DETECTION OF RHIZOCTONIA CROWN AND ROOT ROT IN SUGARBEETGregory J. Reynolds1, Carol E. Windels2, Ian V. MacRae3, and Soizik Laguette4Graduate Student, Professor, Associate Professor, and Assistant Professor, respectively1University of Minnesota, Department of Plant Pathology, St. Paul2University of Minnesota, Department of Plant Pathology and Northwest Research & Outreach Center, Crookston3University of Minnesota, Department of Entomology and Northwest Research & Outreach Center, Crookston4University of North Dakota, Department of Earth System Science a...
发布时间: 2015 - 08 - 11
浏览次数:169
DETECTION OF SUGARCANE AFRICAN STALK BORER ELDANASACCHARINA WALKER (LEPIDOPTERA: PYRALIDAE) USINGHYPERSPECTRAL REMOTE SENSING (SPECTRORADIOMETRY)应用ASD地物光谱仪检测蛀虫ELDANA SACCHARINA(鳞翅目:螟蛾科)对非洲甘蔗茎部的危害程度MOKHELE TA1, AHMED F1 and CONLONG DE2,31School of Environmental Sciences, University of KwaZulu-Natal, Durban, 4041, South Africa2South African Sugarcane Research Institute, Private Bag X02, Mount Edgecombe 4300, South Africa3School of Biological and Conservation Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville, 3209, South AfricaAbstractThe South African sugar industry i...
发布时间: 2015 - 08 - 06
浏览次数:191
LGR氧化亚氮同位素分析仪测量水中硝酸盐成功案例:Analytical Chemistry 文章:Combining Denitrifying Bacteria and Laser Spectroscopy for Isotopic Analyses (δ15N, δ18O) of Dissolved Nitrate通过反硝化细菌和激光同位素分析仪测定溶解硝酸盐中的δ15N和δ18ODavid X. Soto *†, Geoff Koehler †, and Keith A. Hobson †† Environment Canada, 11 Innovation Boulevard, Saskatoon, Saskatchewan, Canada, S7N 3H5AbstractWe present a novel approach for nitrogen (δ15N) and oxygen (δ18O) isotopic analysis of nitrate in water based on the isotopic analysis of N2O produced from the conversion of NO3– by cultured denitrifying bacteria and off-axis integrated cavity output ...
发布时间: 2015 - 07 - 21
浏览次数:207
Nature 发表文章:In-situ unsaturated zone stable water isotope (2H and 18O) measurements in semi-arid environments using tunable o-axis integrated cavity output spectroscopy科学家应用LGR液态水同位素分析仪在半干旱环境下原位测量不饱和带水中2H和18O同位素比值M. Gaj1,2,  M. Beyer1,  P. Koeniger1,  H. Wanke3,  J. Hamutoko3,  and T. Himmelsbach11 Federal Institue for Geosciences and Natural Resources (BGR), Stilleweg 2, Hannover, Germany2 Chair of Hydrology, Faculty of Environment and Natural Resources, University of Freiburg, Fahnenbergplatz, 79098 Freiburg, Germany3Universit...
发布时间: 2015 - 07 - 07
浏览次数:181
Inter- and intraindividual correlations of background abundances of 2H, 18O and 17O in human urine and implications for DLW measurements科学家应用LGR同位素分析仪测定人体尿液中的2H,18O和17O丰度间的相互作用对DLW测量方法的影响E S F Berman, E L Melanson, T Swibas, S P Snaith and J R SpeakmanBackground/Objectives:The method of choice for measuring total energy expenditure in free-living individuals is the doubly labeled water (DLW) method. This experiment examined the behavior of natural background isotope abundance fluctuations within and between individuals over time to assess possible methods of accounting for varia...
发布时间: 2015 - 07 - 01
浏览次数:168
科学家应用Campbell CPEC200闭路涡动相关系统测量森林碳封存Canada: Forest Carbon SequestrationCampbell Scientific CPEC200 monitors eddy-covariance fluxes in British Columbia forest 文章下载地址:79canada-vancouver-island--CPEC200.pdf4da92e4cbee3e5c7273825cef11d6136.pdf (2.84 MB)
发布时间: 2015 - 05 - 19
浏览次数:171
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