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Morphology and multifractal features of a guyot in specific topographic vicinity in the Caroline Ridge,West Pacific

Journal of Oceanology and Limnology 2021年第5期39卷 1591-1604页

作者： Yu GAN Xiaochuan MA zhendong luan Jun YAN CAS Key Laboratory of Marine Geology and Environment Institute ofOceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Geology Pilot National Laboratory for MarineScience and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao266071China

Massive seamounts have been surveyed and documented in the last ***,the morphologies of seamounts are usually described in qualitative manners,yet few quantitative detections have been carried ***,based on the high-re solution multi-beam bathymetric data,we report a recentlysurveyed guy ot on the Caroline Ridge in the West Pacific,and the large-scale volcanic structures and smallscale erosive-depositional landforms in the guyot area have been *** multifractal features of the guyot are characterized for the first time by applying multifractal detrended fluctuation analysis on the surveyed bathymetric *** results indicate that the multifractal spectrum parameters of the seafloor have strong spatial dependency on the fluctuations of local *** small-and large-scale components contribute to the degree of asymmetry of the multifractal spectrum(B),while the fluctuations of B are mostly attributed to the changes in small-scale *** maximum singularity strength(α0)correlates well with the roughness of large-scale landforms and likely reflects the large-scale topographic *** to traditional roughness parameters or monofractal exponents,multifractal spectra are able to depict not only the multiscale characteristics of submarine landforms,but also the spatial variations of scaling *** more comparative works are required for various seamounts,we hope this study,as a case of quantifying geomorphological characters and multiscale behaviors of seamounts,can encourage further studies on seamounts concerning geomorphological processes,ocean bottom circulations,and seamount ecosystems.

关键词： guyot morphology multifractal detrended fluctuation analysis(MFDFA) Caroline Ridge West Pacific Ocean

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Automatic calibration for wobble errors in shallow water multibeam bathymetries

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Journal of Oceanology and Limnology 2022年第5期40卷 1937-1949页

作者： Tianyu YUN Xianhai BU Zhe XING zhendong luan Miao FAN Fanlin YANG College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao 266590China National Marine Data and Information Service Tianjin 300012China Key Laboratory of Marine Geology and Environment&Center of Deep Sea Research Institute of OceanologyChinese Academy of SciencesQingdao 266071China Key Laboratory of Ocean Geomatics Ministry of Natural ResourcesQingdao 266590China

The wobble errors caused by the imperfect integration of motion sensors and transducers in multibeam echo-sounder systems(MBES)manifest as high-frequency wobbles in swaths and hinder the accurate expression of high-resolution seabed micro-topography under a dynamic marine *** are many types of wobble errors with certain coupling among ***,those current calibration methods ignore the coupling and are mainly manual ***,we proposed an automatic calibration method with the ***,given the independence of the transmitter and the receiver,the traditional georeferenced model is modified to improve the accuracy of footprint ***,based on the improved georeferenced model,the calibration model associated with motion scale,time delay,yaw misalignment,lever arm errors,and soundings is ***,the genetic algorithm(GA)is used to search dynamically for the optimal estimation of the corresponding error parameters to realize the automatic calibration of wobble *** simulated data show that the accuracy of the calibrated data can be controlled within 0.2%of the water *** measured data show that after calibration,the maximum standard deviation of the depth is reduced by about 5.9%,and the mean standard deviation of the depth is reduced by about 11.2%.The proposed method has significance in the precise calibration of dynamic errors in shallow water multibeam bathymetrie s.

关键词： multibeam echo-sounder systems footprint reduction wobble errors genetic algorithm automatic calibration

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High-resolution topography measurement of PACMANUS and DESMOS hydrothermal fields using a ROV in Manus basin

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Science Bulletin 2016年第15期61卷 1154-1156页

作者： Xiaochuan Ma Jun Yan zhendong luan Xin Zhang Cui-E Zheng Dajun Sun Institute of Oceanology Chinese Academy of Sciences KeyLaboratory of Marine Geology and EnvironmentQingdao 266071 China Harbin Engineering University Ringgold Standard Institution College of Underwater Acoustic Engineering Harbin 150001China

In China,the lack of high-resolution topographical data from small target areas limits our understanding of deep sea ***,the high-resolution topography of the PACMANUS hydrothermal field and the DESMOS hydrothermal field were measured using a remotely operated underwater vehicle(ROV)with a multibeam system.A composition positioning system on the ROV provided high positioning accuracy(greater than 0.5 m).The data show that four knolls develop in the PACMANUS field on the crest of the Pual ***

关键词：高分辨率地形测量 ROV 热场海盆组合定位系统目标区域多波束系统

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Automatic segmentation of gas plumes from multibeam water column images using a U-shape network

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Journal of Oceanology and Limnology 2023年第5期41卷 1753-1764页

作者： Fanlin YANG Feng WANG zhendong luan Xianhai BU Sai MEI Jianxing ZHANG Hongxia LIU College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Ocean Geomatics Ministry of Natural ResourcesQingdao 266590China Key Laboratory of Marine Geology and Environment Center of Deep Sea ResearchInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Qingdao Institute of Marine Geology China Geological SurveyMinistry of Natural ResourcesQingdao 266237China College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China

Cold seeps are widely developed on the seabed of continental margins and can form gas plumes due to the upward migration of methane-rich *** detection and automatic segmentation of gas plumes are of great significance in locating and studying the cold seep system that is usually accompanied by hydrate layers in the subsurface.A multibeam echo-sounder system(MBES)can record the complete backscatter intensity of the water column,and it is one of the most effective means for detecting cold ***,the gas plumes recorded in multibeam water column images(WCI)are usually blurred due to the interference of the complicated water environment and the sidelobes of the MBES,making it difficult to obtain the effective ***,based on the existing UNet semantic segmentation network,this paper proposes an AP-UNet network combining the convolutional block attention module and the pyramid pooling module for the automatic segmentation and extraction of gas *** experiments are conducted among three traditional segmentation methods and two deep learning *** results show that the AP-UNet segmentation model can effectively suppress complicated water column noise *** segmentation precision,the Dice coefficient,and the recall rate of this model are 92.09%,92.00%,and 92.49%,respectively,which are 1.17%,2.10%,and 2.07%higher than the results of the UNet.

关键词： multibeam water column image(WCI) gas plumes UNet automatic segmentation

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Seabed domes with circular depressions in the North Yellow Sea

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Journal of Oceanology and Limnology 2018年第6期36卷 2154-2165页

作者： WANG Bing ZHANG Xin luan zhendong CHEN Chang’an YAN Jun CAS Key Laboratory of Marine Geology and Environment & Center of Deep Sea Research Institute of OceanologyChinese Academy of Sciences University of Chinese Academy of Sciences Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology

Numerous isolated shallow seabed domes with depressions were discovered in the North Yellow Sea in a high-resolution multibeam echosounder survey. Twelve domes were located within a 11 km by 17 km survey area. The domes in this area were between 0.1 m and 1.0 m high with diameters ranging from 250 to 1 700 m. They were surrounded by corresponding depressions and displayed characteristic shapes ranging from circular to elliptical. The acoustic anomalies displayed on the high resolution sub-bottom profile images demonstrated that shallow gas accumulated just beneath these domes, suggesting that the migration and accumulation of the shallow gas caused the formation of these features. Accumulation atop the seabed domes and erosion within the depressions, as indicated by the lithological features of the sediment cores, suggested that seabed bottom currents also played a role in the formation and evolution of these features. In addition, the simultaneous decrease in the chlorite and sulfate content in core d pore water samples confirmed the presence of submarine fresh/brackish groundwater, which is of interest for hydrological budgets and may be a significant component of the regional hydrologic balance. Our findings suggested that shallow gas accumulation and migration are likely coupled to localized groundwater discharge at this domed site.

关键词： seabed dome shallow gas North Yellow Sea submarine fresh/brackish groundwater

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Application of confocal laser Raman spectroscopy on marine sediment microplastics

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Journal of Oceanology and Limnology 2020年第5期38卷 1502-1516页

作者： LIU Jing ZHANG Xin DU Zengfeng luan zhendong LI Lianfu XI Shichuan WANG Bing CAO Lei YAN Jun Key Laboratory of Marine Geology and Environment&Center of Deep Sea Research Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Marine sediment is the primary sink of microplastics and is an indicator of pollution ***,although there are well-developed detection methods,detection is rarely focused on lowmicrometer-sized particles,mainly due to technique *** this study,a simplifi ed process omitting digestion procedures was developed to pretreat microplastics obtained from marine sediment and was coupled with micro-Raman spectroscopy to identify *** on the overall analysis of the characteristic peak assignments,a Raman spectral reference library was constructed for 18 types of *** addition,the eff ects of the measurement parameters were systematically *** research was then conducted to validate the developed process and investigate microplastic contamination in Huiquan Bay,Qingdao,*** simplifi ed process could retain the original appearance of microparticles and accomplish the detection of<500μm-sized microplastics in environmental *** in the size range of 10-150μm accounted for 76%of all microplastics,and 56%of the total particles was particles smaller than 50μ***(42%)and polyethylene(20%)were predominant components of the *** particular,polypropylene particles smaller than 10μm were identifi ed in marine *** work demonstrates that Raman spectroscopy is not only an eff ective tool for detecting environmental particles but also highly applicable for identifying particles extracted from marine sediment.

关键词： microplastics confocal Raman spectroscopy marine sediment

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Physical characteristics of high concentrated gas hydrate reservoir in the Shenhu production test area,South China Sea

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Journal of Oceanology and Limnology 2023年第2期41卷 694-709页

作者： Jiapeng JIN Xiujuan WANG Zhenyu ZHU Pibo SU Lixia LI Qingping LI Yiqun GUO Jin QIAN zhendong luan Jilin ZHOU Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine Geosciences and Prospecting TechniquesMOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China Deep-sea Multidisciplinary Research Center&Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science&Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China China National Offshore Oil Corporation Research Institute Co.Ltd. Beijing 100028China Guangzhou Marine Geological Survey China Geological SurveyMinistry of Natural ResourcesGuangzhou 511458China Haikou Center of Marine Geological Survey China Geological SurveyHaikou 571127China

High concentrated and heterogeneous distribution of gas hydrates have been identified in the gas hydrate production test region in the Shenhu area,South China *** gas hydrate-bearing sediments with high saturation locate at two ridges of submarine canyon with different thickness and saturations just above the bottom simulating *** crossplots of gamma ray,acoustic impedance(P-impedance)and porosity at four sites show that the sediments can be divided into the upper and lower layers at different depths,indicating different geotechnical reservoir ***,the depositional environments and physical properties at two ridges are analyzed and compared to show the different characteristics of hydrate *** porosity,high P-wave velocity,and coarse grain size indicate better reservoir quality and higher energy depositional environment for gas hydrate at Sites W18 and W19 than those at Sites W11 and *** interpretation is that the base of canyon deposits at Sites W18 and W19 characterized by upward-coarsening units may be turbidity sand layers,thus significantly improving the reservoir quality with increasing gas hydrate *** shelf and slope sliding deposits compose of the fine-grained sediments at Sites W11 and *** gas hydrate production test sites were conducted at the ridge of W11 and W17,mainly because of the thicker and larger area of gas hydrate-bearing reservoirs than those at Sites W18 and *** the results provide useful insights for assessing reservoir quality in the Shenhu area.

关键词： reservoir properties gas hydrate production test region depositional environment South China Sea

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基于水下机器人的海底视频图像拼接技术探讨

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广西科学 2023年第3期30卷 543-550页

作者：刘贤三栾振东黄端东华理工大学江西省数字国土重点实验室江西南昌330013 东华理工大学测绘与空间信息工程学院江西南昌330013 中国科学院海洋研究所海洋地质与环境重点实验室山东青岛266071 中国科学院海洋大科学研究中心山东青岛266071

运用水下机器人(ROV、AUV)配备的高清数码相机拍摄深海底的视频图像(视频、照片)有其自身的特点,如获取难度较高、覆盖面积小、光照不均匀、特征点少、数据量大等。为了获取整体大范围的海底影像,使海洋科研人员更直观、全面地认识海底... 详细信息

运用水下机器人(ROV、AUV)配备的高清数码相机拍摄深海底的视频图像(视频、照片)有其自身的特点,如获取难度较高、覆盖面积小、光照不均匀、特征点少、数据量大等。为了获取整体大范围的海底影像,使海洋科研人员更直观、全面地认识海底微地形地貌,对其底质状况进行分析,以更详细地了解海洋底栖生物的生态环境,需要对这些拍摄的海底视频图像进行拼接处理。本文提出一种基于水下机器人的视频图像拼接流程和处理方法,首先对水下机器人拍摄的海底视频数据进行关键帧提取,得到带时间戳的序列图像;然后导入姿态数据中的偏航角对序列图像进行方位角恢复;最后基于定位数据批量地对经过方位角处理后的序列图像进行拼接和融合匀色,最终获得拍摄范围内的海底全景拼接图像。基于本文提出的图像拼接方法,对某科考航次中获取的视频图像进行拼接处理实验,取得了较好的拼接效果,验证了本文提出的方法的可行性。

关键词：水下机器人海底探测视频图像图像拼接匀色

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Erratum to:Automatic calibration for wobble errors in shallow water multibeam bathymetries

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Journal of Oceanology and Limnology 2022年第6期40卷 2473-2473页

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近百年来黄河改道及输沙量变化对山东半岛泥质楔沉积物粒度特征的影响

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海洋学报 2020年第1期42卷 78-89页

作者：杨立建马小川贾建军阎军栾振东中国科学院海洋研究所海洋地质与环境重点实验室山东青岛266071 华东师范大学河口海岸学国家重点实验室上海200241 中国科学院大学北京100049 中国科学院海洋大科学中心山东青岛266071

对山东半岛泥质楔柱状样进行沉积物粒度分析,并在210Pb测年基础上结合黄河年输沙量、悬浮泥沙粒径、河口位置及沿岸流强弱替代指标等数据研究近百年来黄河改道及输沙量变化对远端沉积区沉积特征的影响。研究结果显示,研究区沉积物粒度... 详细信息

对山东半岛泥质楔柱状样进行沉积物粒度分析,并在210Pb测年基础上结合黄河年输沙量、悬浮泥沙粒径、河口位置及沿岸流强弱替代指标等数据研究近百年来黄河改道及输沙量变化对远端沉积区沉积特征的影响。研究结果显示,研究区沉积物粒度的变化是黄河入海泥沙特征和沿岸流等水动力作用共同影响的结果。1884–1939年及1947–1999年,研究区沉积物粒度特征的变化主要受到沿岸流强弱的影响;1939–1947年及1999–2012年,受1938–1947年花园口决堤以及20世纪90年代末以来黄河年输沙量持续偏低致使源区泥沙不足的影响,沉积物粒度相对粗化,与沿岸流强度的相关性减弱。与黄河入海泥沙近端沉积区不同,研究区粒度特征对黄河尾闾改道事件不敏感,且对花园口决堤及年输沙量低于临界值的响应有一定程度的延迟,这与该区沉积物经历了再悬浮过程及中间复杂的物质混合有关。黄河改道及输沙量变化仍然是远端沉积区沉积特征演化不可忽视的因素。

关键词：粒度端元组分山东半岛泥质楔黄河输沙量改道

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