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Winter Meso-Scale Shear Front in the Yellow Sea and Its Sedimentary Effects

Journal of Ocean University of China 2016年第1期15卷 50-56页

作者： GAO Fei qiao lulu LI Guangxue College of Marine Geosciences Ocean University of China Qingdao 266100 P. R. China Qingdao Institute of Marine Geology China Geological Survey Qingdao 266071 P. R. China Key Laboratory of Submarine Geoscience and Prospecti of Ministry of Education Qingdao 266100 P. R. China Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Ministry of Land and ResourcesQingdao 266071 P. R. China

In this paper,the authors explored the presence of shear fronts between the Yellow Sea Coastal Current(YSCC) and the monsoon-strengthened Yellow Sea Warm Current(YSWC) in winter and their sedimentary effects within the shear zone based on a fully validated numerical *** work added the wind force to a tidal model during simulating the winter baroclinic circulation in the Yellow *** results indicate that the YSWC is significantly strengthened by wind-driven compensation due to a northeast monsoon during winter *** this warm current encounters the North Shandong-South Yellow Sea coastal current,there is a strong reverse shear action between the two current systems,forming a reverse-S-shaped shear front that begins near 34?N in the south and extends to approximately 38?N,with an overall length of over 600 *** main driving force for the formation of this shear front derives from the circulation system with the reverse *** the shear zone,temperature and salinity gradients increase,flow velocities are relatively small and the flow direction on one side of the shear zone is opposite to that on the other *** vertical circulation structure is complicated,consisting of a series of meso-and small-scale anti-clockwise ***,this shear effect significantly hinders the horizontal exchange of coastal sediments carried by warm currents,resulting in fine sediments deposition due to the weak hydrodynamic regime.

关键词： the Yellow Sea shear front numerical simulation sedimentary effect

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Typhoon vs. cold wave: a comparative assessment of geomorphic response and boulder displacement using RFID technology

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Acta Oceanologica Sinica 2023年第7期42卷 25-40页

作者： Lingbo Li Feng Cai Hongshuai Qi lulu qiao Shaohua Zhao Gen Liu Jianhui Liu College of Marine Geosciences Ocean University of ChinaQingdao 266100China Laboratory of Ocean and Coast Geology Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China Fujian Provincial Key Laboratory of Marine Ecological Conservation and Restoration Xiamen 361005China

Extreme storm events in coastal zones play significant roles in shaping the morphology of boulder ***,boulder displacement and the geomorphological evolution of boulder beaches driven by different extreme storm events,especially typhoon events,remain poorly ***,boulder displacement and the geomorphic response on a boulder beach in Fujian,southeastern China,were explored before,during and after a cold wave event(Dec.1–7,2020)and before and after Typhoon In-Fa(Jul.19–27,2021),a large tropical *** was achieved by tracking 42 tagged boulders distributed in the intertidal and supratidal zones using Radio Frequency Identification(RFID)and topographic surveys using real-time kinematic techniques,*** results showed obvious disparities in boulder displacement in different geomorphic zones due to cold wave and typhoon events that were mainly characterized by migration magnitude,range,direction,and mode of *** typhoon event led to rapid and substantial changes in the overall morphology of the boulder beach,while the cold wave event impacted the intertidal morphology of the boulder beach to only a small *** surrounding structure of boulders,beach slope and beach elevation had a combined dominant effect on boulder displacement under the same extreme *** factors(effective wave energy fluxes,incident wave direction,storm surge and water level)had dominant effects on boulder displacement during different extreme *** terms of a single event,the magnitude of the boulder displacement driven by the typhoon was much greater than that driven by the cold ***,considering the frequency and duration of cold waves in winter,the impact of multiple consecutive cold waves on the geomorphology of the boulder beach cannot be ignored in this study *** and repeated interactions between these two processes constitute the complete geomorphic evolution of the boulder *** study contributes to i

关键词： boulder displacement RFID tracing technology extreme events boulder beach morphology

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Responses of Yellow Sea Cold Water Mass to Typhoon Bolaven

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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 Marine Dynamics and Changing Trend off the Modern Yellow River Mouth

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Journal of Ocean University of China 2015年第3期14卷 433-445页

作者： WANG Nan LI Guangxue XU Jishang qiao lulu DADA Olusegun A. ZHOU Chunyan College of Marine Geosciences Ocean University of China Key Laboratory of Submarine Sciences and Prospecting Techniques MOE Ocean University of China Department of Marine Science and Technology Federal University of Technology State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University

Topography around the Yellow River mouth has changed greatly in recent years, but studies on the current state of ma- rine dynamics off the Yellow River mouth are relatively scarce. This paper uses a two-dimension numerical model （MIKE 21） to reveal the tidal and wave dynamics in 2012, and conducts comparative analysis of the changes from 1996 to 2012. The results show that M2 amphidromic point moved southeastward by 11 kin. It further reveals that the tides around the Yellow River mouth are relatively stable due to the small variations in the tidal constituents. Over the study period, there is no noticeable change in the distribution of tidal types and tidal range, and the mean tidal range off the river mouth during the period studied is 0.5-1.1 m. However, the tidal currents changed greatly due to large change in topography. It is observed that the area with strong tidal currents shifted from the old river mouth （1976-1996） to the modem river mouth （1996-present）. While the tidal current speeds decreased continually off the old river mouth, they increased off the modem river mouth. The Maximum Tidal Current Speed （MTCS） reached 1.4 m s-1, and the maximum current speed of 50-year return period reached 2.8 m s-1. Waves also changed greatly due to change in topography. The significant wave height （H1/3） of 50-year return period changed proportionately with the water depth, and the ratio of Hi/3 to depth being 0.4-0.6. H1/3 of the 50-year return period in erosion zone increased continually with increasing water depth, and the rate of change varied between 0.06 and 0.07myr-1. Based on the results of this study, we infer that in the future, the modem river mouth will protrude gradually northward, while the erosion zone, comprising the old river mouth and area between the modern river mouth and the old river mouth （Intermediate region） will continue to erode. As the modem river mouth protrudes towards the sea, there will be a gradual increase in the current speed and dec

关键词： Yellow River mouth tidal dynamics wave numerical simulation change trend 50-year return period

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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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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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Temporal-Spatial Variation of Surface Suspended Matter and Controlling Factors in the Inner Shelf of the East China Sea in Winter

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Journal of Ocean University of China 2019年第1期18卷 9-19页

作者： MIN Jianxiong LI Guangxue DING Dong qiao lulu MA Yanyan YANG Gang ZHANG Yaqi ZHANG Lei LI Shuhao Shanghai Waterway Engineering Design and Consulting Co. Ltd. College of Marine Geosciences Ocean University of China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of Education Ocean University of China

Based on the observed surface suspended matter in the East China Sea in February 2007 and June 2015, an empirical model was established using L1 b's band 4 data to retrieve surface suspended matter from the Moderate Resolution Imagine Spectroradiometer Terra imagery. The squared correlation coefficient is 0.8358, and the root mean square error is 0.4285 mg L-1. The model reflects the distribution characteristics of surface suspended matter in the inner shelf of the East China Sea. In this paper, the satellite images of the study area were retrieved in January from 2001 to 2015, and the monthly distribution of surface suspended matter were obtained. The inter-annual distribution of the study area is similar, and the concentration of surface suspended matter is higher near the shore than offshore. A large amount of surface suspended matter is transported southeast under the influence of Zhejiang and Fujian coastal current and Taiwan warm current. Only a small amount of surface suspension can reach the Kuroshio area. The surface suspended matter concentration changes obviously near the estuary because of the effect of differences in the flux of the Yangtze River. Meanwhile, winter monsoon, temperature front, El Ni?o events, and other factors affect the distribution of surface suspended matter in 100 m isobath to coastal water but minimally influence the distribution in 100 m isobath to deep sea.

关键词： inner shelf of the East China Sea Moderate Resolution Imagine Spectroradiometer surface suspended matter monthly distribution inter-annual variation

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Seasonal Suspended Particles Distribution Patterns in Western South Yellow Sea Based on Acoustic Doppler Current Profiler Observation

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Journal of Ocean University of China 2015年第3期14卷 385-398页

作者： LI Jianchao LI Guangxue XU Jishang qiao lulu DONG Ping DING Dong LIU Shidong SUN Pingkuo Key Lab of Submarine Sciences & Prospecting Techniques MOE Ocean University of China College of Marine Geosciences Ocean University of China

An Acoustic Doppler Current Profiler （ADCP） observation site was set up in the Western South Yellow Sea from 2012 to 2013 to study the local suspended particle matters （SPM） distribution pattern. The SPM concentration could be semi-quantitatively represented by backscatter intensity （Sv）, converted by the echo intensity （E/） of ADCP. Results show two types of SPM in the water column： the quasi-biological SPM and quasi-mineral SPM. The quasi-biological SPM mainly exists in summer half year and is con- centrated above the thermocline. It has periodically diurnal variations with high concentration at night and low concentration in the daytime. The quasi-mineral SPM is located in lower part of the water column, with similar relation to monthly tidal current variation all year round. However, the daily quasi-mineral SPM distribution patterns vary between summer and winter half year. The sunlight is thought to be the origin factor leading to the diurnally vertical motion of the biological features, which might cause the diurnal Sv variation. Unlike in winter half year when tidal current is relatively single driving force of the monthly SPM pattern, the high speed current near the thermocline is also responsible for the concentration of quasi-mineral SPM in summer half year. The sediment input difference between summer and winter half year contribute to the varied daily variation of quasi-mineral SPM with re-suspended SPM ir~ winter and sediments from Yellow Sea Mud Area （YSMA） in summer. The seasonal variations in hydrodynamics, water structure and heavy-wind incidents are the primary factors influencing the differential seasonal SPM distribution patterns.

关键词： the South Yellow Sea backscatter intensity suspended particle matters seasonal distribution patterns diurnal periodicvariation

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Evolution of Palaeoenvironment of the South Yellow Sea Since the Last Deglaciation

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Journal of Ocean University of China 2020年第4期19卷 827-836页

作者： WANG Haoyin LI Guangxue ZHANG Yang LIU Yong LIU Dongsheng DING Dong XU Jishang MA Yanyan qiao lulu WANG Liyan LI Qian Key Laboratory of Submarine Sciences&Prospecting Techniques Ministry of EducationOcean University of ChinaQingdao 266100China College of Marine Geosciences Ocean University of ChinaQingdao 266100China

The sediments in core YS01 recovered from the South Yellow Sea mud deposit zone contain abundant benthic foraminifera,particularly shallow continental shelf species,but rare of planktonic *** benthic foraminifera are dominated by stenohaline cold shallow-water species and euryhaline brackish-water *** this paper,the palaeoenvironmental changes were discussed based on the grain-size compositions and benthic foraminiferal *** different benthic foraminiferal assemblages were discriminated by species analysis from the foraminiferal *** to AMS14C dating data in core YS01,we identified four main stages of marine environmental changes since the last deglaciation:a near-shore depositional stage(13.1–9.5 kyr B.P.),a transitional stage from near-shore deposition to shallow-sea deposition(9.5–5.6 kyr B.P.),a high sea level stage with shallow-sea deposition(5.6–2.9 kyr B.P.),and a stable shallow-sea depositional stage(2.9 kyr *** the present).

关键词： benthic foraminifera last deglaciation South Yellow Sea palaeoenvironmental change

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