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Responses of Yellow Sea Cold Water Mass to Typhoon Bolaven

Journal of Ocean University of China 2019年第1期18卷 31-42页

作者： LI Jianchao LI Guangxue XU Jishang QIAO Lulu MA Yanyan ding dong LIU Shidong Fisheries College Ocean University of China Key Laboratory of Submarine Sciences & Prospecting Techniques MOE Ocean University of China College of Marine Geosciences Ocean University of China

A two-month seabed-mounted observation(YSG1 area) was carried out in the western Yellow Sea Cold Water Mass(YSCWM) using an RDI-300 K acoustic Doppler current profiler(ADCP) placed at a water depth of 38 m in late summer, 2012. On August 2012, Typhoon Bolaven passed east of YSG1 with a maximum wind speed of 20 m s-1. The water depth, bottom temperature, and profile current velocities(including u, v and w components) were measured, and the results showed that the typhoon could induce horizontal current with speed greater than 70 cm s-1 in the water column, which is especially rare at below 20 meters above bottom(mab). The deepening velocity shear layer had an intense shear velocity of around 10 cm s-1 m-1, which indicated the deepening of the upper mixed layer. In the upper water column(above 20 mab), westward de-tide current with velocity greater than 30 cm s-1 was generated with the typhoon's onshore surge, and the direction of current movement shifted to become southward. In the lower water column, a possible pattern of eastward compensation current and delayed typhoon-driven current was demonstrated. During the typhoon, bottom temperature variation was changed into diurnal pattern because of the combined influence of typhoon and tidal current. The passage of Bolaven greatly intensified local sediment resuspension in the bottom layer. In addition, low-density particles constituted the suspended particulate matter(SPM) around 10 mab, which may be transported from the central South Yellow Sea by the typhoon. Overall, the intensive external force of the Typhoon Bolaven did not completely destroy the local thermocline, and most re-suspended sediments during the typhoon were restricted within the YSCWM.

关键词： Yellow Sea Cold Water Mass typhoon typhoon-driven current thermocline suspended particulate matter

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Estimation of Extreme Marine Hydrodynamic Variables in Western Laizhou Bay

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Journal of Ocean University of China 2015年第3期14卷 425-432页

作者： DAI Yanchen QIAO Lulu XU Jishang ZHOU Chunyan ding dong BI Wei Key Lab of Submarine Sciences & Prospecting Techniques MOE Ocean University of China China Petroleum & Chemical Corporation Shengli Oilfield Branch College of Marine Geosciences Ocean University of China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Qingdao Meteorological Bureau

Laizhou Bay and its adjacent waters are of great importance to China＇s marine oil and gas development. It is therefore crucial to estimate retttrn-period values of marine environmental variables in this region to ensure the safety and success of maritime engineering and maritime exploration. In this study, we used numerical simulations to estimate extreme wave height, sea current velocity and sea-level height in westem Laizhou Bay. The results show that the sea-level rise starts at the mouth of the bay, increases toward west/southwest, and reaches its maximum in the deepest basin of the bay. The 100-year return-period values of sea level rise can reach 3.4-4.0m in the western bay. The elevation of the western part of the Qingdong Oil Field would remain above the sea sur- face during extreme low sea level, while the rest of the oil field would be 1,6-2.4m below the sea surface. The return-period value of wave height is strongly affected by water depth; in fact, its spatial distribution is similar to the isobath＇s. The 100-year return-period values of effective wave height can be 6m or higher in the central bay and be more than 1 m in the shallow water near shore. The 100-year return-period values of current velocity is about 1.2-1.8 ms-1 in the Qingdong Oil Field. These results provide scientific basis for ensuring construction safety and reducing construction cost,

关键词： Laizhou Bay extreme value current velocity wave surface elevation return period

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The Seasonal Variations of Aerosols over East Asia as Jointly Inferred from MODIS and OMI

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Atmospheric and Oceanic Science Letters 2011年第6期4卷 330-337页

作者： LIU Qi ding Wei-dong FU Yun-Fei School of Earth and Space Sciences University of Science and Technology of China HeJei 230026 China Anhui Meteorological Observatory Hefei 230031 China

Data on aerosol optical thickness(AOT) and single scattering albedo(SSA) derived from Moderate Resolution Imaging Spectrometer(MODIS) and Ozone Monitoring Instrument(OMI) measurements,respectively,are used jointly to examine the seasonal variations of aerosols over East *** seasonal signals of the total AOT are well defined and nearly similar over the land and over the *** findings indicate a natural cycle of aerosols that originate primarily from natural emissions. In contrast,the small-sized aerosols represented by the fine-mode AOT,which are primarily generated over the land by human activities,do not have evident seasonalscale fluctuations.A persistent maximum of aerosol loadings centered over the Sichuan basin is associated with considerable amounts of fine-mode aerosols throughout the *** regions exhibit a general spring maximum. During the summer,however,the aerosol loadings are the most marked over north central *** occurrence may result from anthropogenic fine particles,such as sulfate and *** typical regions were selected to perform a covariation analysis of the monthly gridded AOT and *** southwestern and southeastern China,if the aerosol loadings are small to moderate they are composed primarily of the highly absorptive aerosols. However,more substantial aerosol loadings probably represent less-absorptive *** opposite covariation pattern occurring over the coastal-adjacent oceans suggests that the polluted oceanic atmosphere is closely correlated with the windward terrestrial *** central China is strongly affected by dust aerosols that show moderate *** finding may explain the lower variability in the SSA that accompanies increasing aerosol loadings in this region.

关键词： aerosol optical thickness single scattering albedo seasonal variation Moderate Resolution Imaging Spectrometer Ozone Monitoring Instrument

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Source Evolution and Its Relationship to Climate Change Since the Middle–Late Pleistocene in Laizhou Bay, China

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Journal of Ocean University of China 2020年第1期19卷 113-123页

作者： GONG Chuanzhang LI Guangxue LIU Yong ding dong XU Jishang MA Yanyan QIAO Lulu and WANG Haoyin College of Marine Geosciences Ocean University of ChinaQingdao 266100China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of EducationOcean University of ChinaQingdao 266100China

Through the geochemical analysis of two hundred-meters cores KD4 and ZK3 from Laizhou Bay,in this study,we determined the distribution law and controlling factors of the geochemical *** analyzed 24 elements with respect to their R factors and major principal components,which were combined with the source discrimination functions DFCr/Th and DFCa/Al to obtain the sediment source index and its variation with depth for this area.A comparison of the changes in climate indicators suggests a clear correlation between the source and climate *** results show that the Yellow River and surrounding short-term rivers are the main sediment sources in this *** PC3 of the KD4 core and PC2 of the ZK3 core(e.g.,CaO,MnO,SiO2)exhibit significant variations and reflect the relative contributions of Yellow River *** deposition process can be divided into six stages:in Phase I(MIS 5c–MIS 5a),the Yellow River formed,and the composition of the Yellow River had a greater influence on the sedimentary composition of the study *** Phase II(MIS 5a–MIS 3),the sediment sources of the Yellow River and the short-term streams in this area were wavering,with the sediments derived from short-term rivers playing a more important *** Phase III(MIS 3),with a sharp drop in temperature,the study area was in the process of retreat,and the sediment source changed from the Yellow River to short-term rivers,after which the Yellow River source material remained the main sediment source for the region.A similar process occurred three more times in Phase IV(MIS 3–MIS 2),Phase V(MIS 2–MIS 1),and Phase VI(MIS 1).With changes in climate,especially during alternating sea-land phases,the sediment source varied in marine-terrestrial-marine phases,and the changes are observed as Yellow River source-surrounding provenance-Yellow River ***,this process of change is not synchronized with the sea-land strata alternation.

关键词： Laizhou Bay source geochemistry Yellow River climate change

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Filling of the Three Gorges Reservoir to the 135-m Level: Instant Effects on the Yangtze Discharge and Suspended Sediment Concentration Entering the Estuary

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Journal of Ocean University of China 2009年第3期8卷 291-295页

作者： CHU Zhongxin ZHAI Shikui ZHANG Jing ding dong Key Lab of Submarine Geosciences and Prospecting Techniques Ministry of Education Ocean University of China Qingdao 266100 P. R. China

Via the valuable opportunity of the Three Gorges Reservoir (TGR) 135-m filling in June 2003, the Yangtze discharge and suspended sediment concentration (SSC) entering the estuary during the period from 15 May to 15 July 2003 were analyzed to examine the instant effects of the filling on them. The Yangtze discharge and SSC entering the estuary in the periods before, during and after the filling clearly indicated three phases: 1) the pre-storage phase characterized by natural conditions, in which the SSC increased with increasing water discharge; 2) the storage phase, during which the SSC decreased dramatically with decreasing water discharge; and 3) the post-storage phase, during which both the SSC and water discharge remained at relatively low levels first until the end of June, then the SSC increased gradually with increasing water discharge. It seems that the times for the instant effects of the decreasing discharge downstream from the upper Yangtze on the Yangtze discharge and SSC entering the estuary due to the TGR 135-m filling to take place were about 5 d and 1 d respectively, while both were about 18 d for those of the increasing discharge. This probably reflects the buffering and resultantly hysteresis of the 1800-km stretch from the upper Yangtze to the estuary. The results are helpful for scientific and hydrological investigation of the Yangtze mainstream downstream from the TGR Dam and of the estuarine and adjacent coastal waters.

关键词： Three Gorges Reservoir (TGR) 135-m filling Yangtze River estuary water discharge suspended sediment concentration

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Numerical Study on Seasonal Transportation of the Suspended Sediments in the Modern Yellow River Mouth Effected by the Artificial Water and Sediment Regulation

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Journal of Ocean University of China 2019年第1期18卷 20-30页

作者： WANG Nan QIAO Lulu LI Guangxue ZHONG Yi SONG Dehai ding dong GAO Fei JI Fengying College of Oceanic and Atmospheric Ocean University of China College of Marine Geosciences Ocean University of China Key Laboratory of Submarine Sciences & Prospecting Techniques MOE Ocean University of China Key Laboratory of Physical Oceanography MOE Ocean University of China Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and Resources Qingdao Institute of Marine Geology National Marine Data and Information Service

Since 2002, an artificial water and sediment regulation(AWSR) has been carried out, which largely reduced water and sediment discharged from the Yellow River into the Bohai Sea. Although the sediment transport in the Yellow River Mouth(YRM) has been observed and modeled intensively since AWSR, but preferentially for the non-storm conditions. In this study, a three-dimensional current-wave-sediment coupled model, DHI-MIKE numerical model, was used to examine the seasonal suspended-sediment transport in the YRM after the AWSR. Results show that the seasonal distribution of suspended-sediments in the YRM is dominated by wind and wave rather than river input. The major transport pathway of suspended-sediments is from the western Laizhou Bay to the Bohai Strait during the winter monsoon, especially in storm events. In addition, about 66% of the river sediments deposit within 30 km of the YRM, which is smaller than previous estimations. It suggests that the YRM has been eroded in recent decades.

关键词： Yellow River Mouth artificial water and sediment regulation MIKE suspended-sediment transport seasonal variation

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A geomorphological response of beaches to Typhoon Meari in the eastern Shandong Peninsula in China

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Acta Oceanologica Sinica 2015年第9期34卷 126-135页

作者： ding dong YANG Jichao LI Guangxue DADA Olusegun A GONG Lixin WANG Nan WANG Xiangdong ZHANG Bin College of Marine Geosciences Ocean University of China National Deep Sea Center State Oceanic Administration Department of Marine Science and Technology Federal University of Technology

Eight representative beach profiles on the eastern coast of the Shandong Peninsula are observed and measured in 2011 and 2012 to determine the coastal processes under the lower tropical wind speed condition and the beach response to and recovery from the tropical storm Meari in a rare typhoon region. The results show that it is the enhancement and directional change of cross-shore and longshore sediment transports caused by Meari that leads to the beach morphological changes, and most of the sediment transports occur during the pre-Meari landing phase. The erosional scarp formation and the berm or beach face erosion are the main geomorphological responses of the beaches to the storm. The storm characteristics are more important than the beach shapes in the storm response process of the beaches on Shandong Peninsula. The typhoon is a fortuitous strong dynamic event, and the effect on the dissipative beach is more obvious than it is on the reflective beach in the study region. Furthermore, the beach trend is the main factor that controlls the storm effect intensity, and it is also closely related to the recovery of the beach profiles.

关键词： beach typhoon geomorphological response Shandong Peninsula in China

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Effect of tungsten carbide particles on microstructure and mechanical properties of Cu alloy composite bit matrix

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Journal of Iron and Steel Research International 2024年第2期31卷 519-530页

作者： ding-qian dong Feng-yuan He Xin-hui Chen Hui Li Kai-hua Shi Hui-wen Xiong Xin Xiang Li Zhang College of Mechanical Engineering Sichuan University of Science and EngineeringZigong643000SichuanChina State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083HunanChina Zigong Cemented Carbide Co. Ltd.Zigong643011SichuanChina Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan University of Science and EngineeringZigong643000SichuanChina

Copper alloy composite bit matrix was prepared by pressureless vacuum infiltration,using at least one of the three kinds of tungsten carbide particles,for example,irregular cast tungsten carbide,monocrystalline tungsten carbide and sintered reduced tungsten carbide *** effects of powder particle morphology,particle size and mass fraction of tungsten carbide on the microstructure and mechanical properties of copper alloy composite were investigated by means of scanning electron microscopy,X-ray diffraction and abrasive wear test in *** results show that tungsten carbide morphology and particle size have obvious effects on the mechanical properties of copper alloy *** tungsten carbide partially dissolved in the copper alloy binding phase,and layers of Cu_(0.3)W_(0.5)Ni_(0.1)Mn_(0.1)C phase with a thickness of around 8–15μm were formed on the edge of the cast tungsten *** 45%irregular crushed fine cast tungsten carbide and 15%monocrystalline cast tungsten carbide were used as the skeleton,satisfactory comprehensive performance of the reinforced copper alloy composite bit matrix was obtained,with the bending strength,impact toughness and hardness reaching 1048 MPa,4.95 J/cm^(2) and 43.6 HRC,*** main wear mechanism was that the tungsten carbide particles firstly protruded from the friction surface after the copper alloy matrix was worn,and then peeled off from the matrix when further wear occurred.

关键词： Polycrystalline diamond compact Pressureless vacuum infiltration Copper alloy composite bit matrix Microstructure characterization Abrasive wear behavior

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NH_(4)PF_(6) assisted buried interface defect passivation for planar perovskite solar cells with efficiency exceeding 21%

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Rare Metals 2023年第10期42卷 3399-3409页

作者： Xing-dong ding Xiao-Wen Zhou Jin-Wei Meng Hao-Xin Wang Tai Wu Yong Hua Cheng Chen Ming Cheng Institute for Energy Research School of Energy and Power EngineeringJiangsu UniversityZhenjiang212013China Yunnan Key Laboratory for Micro/Nano Materials&Technology School of Materials and EnergyYunnan UniversityKunming650091China

The buried interface defects severely affect the further enhancements of efficiency and stability of SnO_(2)-based planar perovskite solar cells(PSCs).To well tackle this problem,we propose a passivation strategy employing NH_(4)PF_6 to modify the buried interface of perovskite layer((FAPbI_(3))_(0.85)(MAPbBr_(3))_(0.15) composition) in planar *** introducing NH_(4)PF_(6),the oxygen defects on the surface of SnO_(2) film are greatly restricted due to the coordinate interaction between fluorine atoms(F) in PF_(6)^(-)and undercoordinated Sn^(4+).Meanwhile,the hydrogen bonding interaction(N-H…I) between NH_(4)PF_(6) and PbI_(2) can passivate the non-radiative charge recombination sites,significantly optimizing the quality of perovskite film,as well as the charge transfer process at the SnO_(2)/perovskite *** a result,the NH_(4)PF_(6)-modified PSC obtains a champion power conversion efficiency(PCE) of 21.11%superior to the reference device(18.46%),and the device with an active area of 1 cm^(2) achieves a PCE as high as17.38%.Furthermore,the unencapsulated NH_(4)PF_(6)-modified PSCs show good humidity stability and retain about80% of the initial PCE after 1080 h aging at the relative humidity(RH) of 35% ± 5%.

关键词： Defect passivation Interface engineering Surface charge transfer Stability Perovskite solar cells(PSCs)

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Zwitterionic monolayer grafted ceramic membrane with an antifouling performance for the efficient oil-water separation

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Chinese Journal of Chemical Engineering 2022年第2期35卷 227-235页

作者： Tianyu Zhang Qian Wang Wei Luan Xue Li Xianfu Chen dong ding Zhichao Shen Minghui Qiu Zhaoliang Cui Yiqun Fan State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembranesCollege of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Zhangjiagang Institute of Nanjing Tech University Suzhou 215699China

Enormous demands on the separation of oil/water(O/W)emulsions in various industries,such as petrochemical,food and pharmaceutical industries,are looking for high performance and energy-efficient separation *** membranes have been used to deal with O/W emulsions,for its outstanding characteristics of easy-operation,high-flux,and long-term ***,membrane fouling is still a challenge in the industrial application of ceramic ***,antifouling ceramic membranes were fabricated by grafting zwitterions on the membrane surface via an environment-friendly two-step grafting method,which improves the antifouling property and *** grafting of such zwitterion on the ceramic surface was assessed by the combination of FTIR and XPS *** importantly,the hydration can be formed by electrostatic interactions layer on the modified membrane,which was confirmed by TGA *** antifouling performance of prepared zwitterionic ceramic membranes in the separation of O/W emulsions was systematically *** results suggested that zwitterion can significantly improve the flux of ceramic ultrafiltration membrane,and can also improve antifouling property dramatically by reducing the irreversible fouling in the separation of O/W ***,zwitterionic ceramic membranes hold promising potentials as an antifouling,highly efficient and green method in the practical purification of the O/W emulsions.

关键词： Ceramic membrane Zwitterionic Anti-fouling Hydration layer Oil/water emulsion

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