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| 1 | Turbidity maximum formation and its seasonal variations in the Zhujiang(Pearl River)Estuary,southern China显示文摘Real-time observations in the field and numerical simulations(with Delft3D) were combined to study the formation, distribution and the relevant influencing factors of turbidity maximum(TM) in the Zhujiang(Pearl River) Estuary(ZE). The spatial distribution pattern of the TM varies with the longitudinal distributions of salinity and suspended sediment concentration(SSC). The SSC is enhanced and the TM is intensified during dry seasons,whereas the center of the TM moves upstream by a distance of 10 km during wet seasons. The formation of the TM is influenced by a complex combination of numerous factors, including tides, river discharges and topography, wherein sediment resuspension and vertical circulation dominate the formations and variability of the TM. | LIU Runqi WANG Yaping GAO Jianhua WU Ziyin GUAN Weibing | 2016 | Acta Oceanologica Sinica2016，35，8： | 5 |
| 2 | Features of the physical environment associated with green tide in the southwestern Yellow Sea during spring显示文摘Massive green tides caused by Ulva prolifera in the Yellow Sea have occurred every summer since 2007 and have caused huge economic losses for local governments. The Subei(North Jiangsu Province, China) Shoal, with its large-scale Porphyra aquaculture, has been regarded as the most important source of U. prolifera for green tides.To reveal the physical mechanisms of floating and drifting algae in this area, the characteristics of the current, the temperature, the salinity and suspended particulate matter(SPM) in the southwestern Yellow Sea, especially in the Subei Shoal, were studied. The topography of the radial sand ridges in the Subei Shoal constrains the features of the currents and causes net longitudinal and latitudinal movements. The longitudinal net movement is a dominant dynamic factor that can bring U. prolifera into offshore waters. The amount of gas that is produced by algae during photosynthesis determines whether U. prolifera can float well on the sea surface after it is disposed into the water from Porphyra aquacultural apparatus. The Subei Shoal is characterized by a high turbidity, which can result in significant light attenuation and affect the photosynthesis together with the buoyancy of a U.prolifera in the water. According to satellite remote sensing data from 2012, the three-month-averaged surface SPM(April, May and June) in the Subei Shoal was 140 mg/dm3, and the north of the Subei Shoal(the north of34.5°N), it was 11 mg/dm3. According to the monthly averaged surface SPM in April, the transparency in the Subei Shoal was only 0.1 m, but it often exceeded 2.0 m outside of the Subei Shoal. The results explain why the floating ability of U. prolifera increases significantly once the green algae drifted outside the Subei Shoal. | BAO Min GUAN Weibing WANG Zongling WANG Difeng CAO Zhenyi CHEN Qi | 2015 | Acta Oceanologica Sinica2015，34，7： | 3 |
| 3 | The brightness reversal of submarine sand waves in “HJ-1A/B” CCD sun glitter images显示文摘The brightness reversal of submarine sand waves appearing in the small satellite constellation for environment and disaster monitoring and forecasting('HJ-1A/B') CCD sun glitter images can affect the observation and depth inversion of sand wave topography. The simulations of the normalized sun glitter radiance on the submarine sand waves confirm that the reversal would happen at a specific sensor viewing angle, defined as the critical angle. The difference between the calculated critical angle position and the reversal position in the image is about 1, which is excellent in agreement. Both the simulation and actual image show that sand wave crests would be indistinct at the reversal position, which may cause problems when using these sun glitter images to analyze spatial characteristics and migration of sand waves. When using the sun glitter image to obtain the depth inversion, one should take the advantage of image properties of sand waves and choose the location in between the reversal position and the brightest position. It is also necessary to pay attention to the brightness reversal when using 'HJ-1A/B' CCD images to analyze other oceanic features, such as internal waves, oil slicks, eddies, and ship wakes. | HE Xiekai CHEN Ninghua ZHANG Huaguo GUAN Weibing | 2015 | Acta Oceanologica Sinica2015，34，1： | 1 |
| 4 | Ecological wetland paradigm drives water source improvement in the stream network of Yangtze River Delta显示文摘Jiaxing created a precedent using bypass riparian marshes to purify micro-polluted water sources in China.Pond-wetland complex with constructed root channel technology becomes a paradigm which can be analogized as'human-body wetland model'based on bionics or biomimetics.Heterogeneous plant-bed/ditch system with highly active land/water ecotone interfaces,especially meandering boundaries,breeds many biochemical reactions'living areas'.Optimization of hydraulic regulation promotes redox environment alternations and wetland treatment efficiency.Here we reported a series of upgrades and performances in Guanjinggang wetland after the Shijiuyang prototype.Morphological reform of plant-bed/ditch system played a vital role.Spatially root channel zone was main force of wetland purification,and temporally the treatment effect was higher in low-temperature seasons indicating non-temperature dependent mechanisms worked.Water pollution comprehensive index improved steadily from IV to III,and comprehensive pollution load was reduced by ca.40%–60%.Comprehensive evaluation function value further showed the gradients purification effect of the upgraded wetland.Ecological wetlands ameliorated source water quality,and reduced drinking water treatment reagents,thereby bringing about economic benefits.Through wetlands operation,people can see how the micro-polluted surface water becomes clear and clean,so promoting a significant social benefit.As a viable component of urban green space,wetlands could beautify regional eco-environment,freshen the air,increase urban ecological taste,and enhance the eco-environmental protection publicity.Thus,the multifunctional service values and indirect benefits are substantial.Jiaxing ecological wetlands provide a typical paradigm for water pollution remediation in developing countries and plays a leading role in technology engineering radiation effect. | Weidong Wang Ting Yang Weibing Guan Weixi Peng Ping Wu Bin Zhong Chundong Zhou Qinghua Chen Rongbin Zhang Kewen Xu Chengqing Yin | 2021 | Journal of Environmental Sciences2021，33，12： | 1 |
| 5 | Impacts of channel dredging on hydrodynamics and sediment dynamics in the main channels of the Jiaojiang River Estuary in China显示文摘Channel dredging in estuaries increases water depth and subsequently impacts sediment dynamics and morphology. The Jiaojiang River Estuary is dredged frequently owing to heavy shipping demands. In this study,the effects of different dredging schemes on siltation were assessed through numerical modeling. The sediment model of the Jiaojiang River Estuary utilized an optimized bottom boundary layer model that considered the bed sediment grain size and fluid mud, and this model was calibrated using field data. Result reveal that channel dredging modifies the flow velocity inside and around the channel by changing the bathymetry;subsequently, this affects the residual current, bed stress, suspended sediment concentration, and sediment fluxes. Increasing the dredging depth and width increases the net sediment fluxes into the channel and dredging depth has a greater influence on the channel siltation thickness. When the dredging depth is 8.4 m or11.4 m, the average siltation thickness of the channel is 0.07 m or 0.15 m per mouth respectively. The parallel movement of the channel has small effects on the siltation volume during the simulation period. The sediment deposits in the channel primarily originates from the tidal flats, through bottom sediment fluxes. Vertical net circulation has a dominant impact on siltation because the difference of horizontal current of each layer on the longitudinal section of the channel increases, which intensifies the lateral sediment transport between the shoal and channel. The influence of vertical frictional dissipation on the lateral circulation at the feature points accounts for more than 50% before dredging, while the non-linear advective term is dominant after dredging. Tidal pumping mainly affects the longitudinal sediment fluxes in the channel. These results can be used for channel management and planning for similar estuaries worldwide. | Yanming Yao Xueqian Chen Jinxiong Yuan Li Li Weibing Guan | 2023 | Acta Oceanologica Sinica2023，42，9： | 0 |
| 6 | Dynamics of Phaeocystis globosa bloom and implications for its seed sources in the Beibu Gulf,China显示文摘Algal blooms of haptophyte Phaeocystis globosa have been recorded in the Beibu Gulf,South China Sea(SCS)since 2011.Recent evidence suggests that TypeⅠand TypeⅣare the two dominant genotypes of P.globosa coexisting in this area,and their marker pigment profiles,colony sizes,and genetic information differ.Two genotype-specific quantitative polymerase chain reaction(qPCR)assays were used to clarify the distribution and dynamics of P.globosa bloom in the Beibu Gulffrom November 2018 to February 2019.Results show that the patterns of spatial-temporal distribution of TypeⅠand TypeⅣwere similar,the abundance of TypeⅣwas higher than that of TypeⅠduring the algal bloom,and thus TypeⅣcells dominated the P.globosa bloom in winter 2018.The relationships between environmental factors and P.globosa abundance indicated that temperature and nitrate were critical to the distribution and dynamics of P.globosa blooms in this area.The distribution of P.globosa cells in different water masses before the bloom revealed that the westward water via the Qiongzhou Strait,the SCS bottom water,and the current in the northwestern waters of Hainan Island could transport P.globosa cells into the Beibu Gulf serving as the seed sources triggering the intense blooms in the Beibu Gulf. | Zhuang NIU Weibing GUAN Jinxiu WANG Yongquan YUAN Fanzhou KONG Chao LIU Qingchun ZHANG Rencheng YU | 2022 | Journal of Oceanology and Limnology2022，40，6： | 0 |
| 7 | Three-dimensional circulation in northern South China Sea during early summer of 2015显示文摘Using the hydrographic data obtained during two nearly simultaneous surveys in June 2015,we carried out semi-diagnostic calculations with the help of a finite element model and a modified inverse method,to study the circulation in the northern South China Sea(NSCS)during the early summer of 2015.A number of new circulation features were found.(1)In most of the observation region,a large,basin-scale anticyclonic gyre appeared south of the 50-m isobath,which contained anticyclonic eddies.One anticyclonic eddy existed from the sea surface to 50-m depth,whose center showed no tilt,while the center of another eddy tilted eastward from the sea surface to 500-m depth.In the eastern part of the observation region,which is west of the Dongsha Islands,there was a sub-basin-scale cyclonic gyre containing a cyclonic eddy whose center tilted southward from the sea surface to 200-m depth.(2)There was a cross-continental slope current(CCSC)in the area southwest of the Dongsha Islands.Its volume transport was about 2.0×10^(6) m^(3)/s.(3)From the estimated order of magnitude of the stream function equation,the joint effect term of the baroclinity and relief(JEBAR)andβ-effect term are two important dynamic mechanisms affecting the variation of the circulation in the NSCS.(4)The JEBAR,as a transport-generating term,resulted in the dynamic mechanism determining the pattern of the depth-averaged flow across the contours of potential vorticity fH–1.Furthermore,we show that the negative values of the JEBAR were the most dominant dynamic mechanism,causing the CCSC southwest of the Dongsha Islands to deflect from the isobaths and veer toward the deep water.The CCSC around the Dongsha Islands was located further southwest during the early summer of 2015 than during the fall of 2005(revealed by a published study),which suggests that the location of the CCSC around the Dongsha Islands may vary with season. | Huiqun Wang Yaochu Yuan Weibing Guan Chenghao Yang Dongfeng Xu | 2021 | Acta Oceanologica Sinica2021，40，7： | 0 |
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