Article
Geosciences, Multidisciplinary
Jianliang Lin, Bram C. van Prooijen, Leicheng Guo, Chunyan Zhu, Qing He, Zheng Bing Wang
Summary: Channel deepening can trigger positive feedback loops between tidal deformation, sediment import, and drag reduction, leading to a regime shift in estuaries from low to hyper-turbid states. This study hypothesizes a transition in suspended sediment concentration profiles driven by vertical mixing and settling feedback loops, which was validated by historical observations in the North Passage of the Changjiang Estuary. The study also found the development of a mobile pool of concentrated benthic suspensions (CBS) in the North Passage, influencing sediment trapping and drag reduction in the estuary.
Review
Green & Sustainable Science & Technology
Yifei Li, Qingbing Lu, Jian Yang, Yi Xing, Wei Ling, Kai Liu, Qizhen Yang, Hongjie Ma, Zengxin Pei, Tianqi Wu, Haochen Guo, Ziyuan Gao, Lianfeng Zhao, Junnan Sun, Fan Yang, Xiumei Tang, Xiaoyan Li, Ding Zhao
Summary: This paper provides a systematic review of the sources, hazards, and impacts of microplastics in the Changjiang Estuary. It analyzes the current research on microplastics in the estuary and presents the abundance, characteristics, and primary sources of microplastics in the area. The paper also offers relevant suggestions based on the specific situation of the Changjiang River Estuary and developed microplastic treatment technologies. It serves as a structured reference for future research and helps in assessing the ecological impact of microplastics.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Oceanography
Liming Xue, Xiuzhen Li, Benwei Shi, Bin Yang, Shiwei Lin, Yiquan Yuan, Yuxi Ma, Zhong Peng
Summary: This study investigated wave attenuation by salt marshes at the Nanhui nearshore salt marshes in the Yangtze Estuary, China. The results showed that salt marsh vegetation could effectively attenuate wave height, with different effects in various environments and species. Landscape pattern also had an impact on wave attenuation, and strategies for salt marsh restoration were proposed to improve coastal defenses.
OCEAN & COASTAL MANAGEMENT
(2021)
Article
Environmental Sciences
Jing Liu, Qingzhen Z. Yao, Tiezhu Z. Mi, Qinsheng S. Wei, Hongtao T. Chen, Zhigang G. Yu
Summary: The concentration and structure of nutrients in marine ecosystems are crucial for their sustainability. Changes in nutrient input from land, wastewater treatment efforts, and the construction of the Three Gorges Reservoir have caused significant variations in nutrient concentration and structure in the Changjiang River Estuary, leading to important impacts on the coastal ecosystem.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Geography, Physical
Xingjie Guo, Daidu Fan, Shuwei Zheng, Hanmei Wang, Baocheng Zhao, Changjie Qin
Summary: This study analyzes the subtidal morphodynamic variations in the Yangtze Estuary, revealing severe erosion in the estuary, especially in the South Branch and the delta front. The negative correlation between estuarine erosional volume and riverine sediment discharge, as well as the influence of large-scale estuarine engineering projects on local morphodynamics, are highlighted. Additionally, the reduction in sediment discharge into the open sea has led to increased erosion in the delta front.
Article
Environmental Sciences
Lingbin Zhao, Lei Gao, Laodong Guo
Summary: Large world rivers, like the Changjiang River, play a significant role in regulating ecosystem function and biogeochemical processes in coastal marine environments through their flux of dissolved organic matter (DOM). Seasonal variations in composition and molecular size of DOM from the Changjiang River demonstrate lower DOC, lower aromaticity, and lower colloidal abundance compared to other world rivers. The study highlights the importance of understanding the impact of DOM from large rivers on the biogeochemical cycling in coastal marine areas.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Shuzhen Song, Lei Gao, Jianzhong Ge, Wenyun Guo, Daoji Li
Summary: Nutrients and dissolved organic carbon, including carbohydrates, play a crucial role in the carbon cycle in estuarine and coastal ecosystems. Tidal variations in DOC, monosaccharide, and nutrient concentrations were observed in the Changjiang Estuary and East China Sea, with some components showing correlations with tidal phases and cycles, while others did not. The asymmetrical flood-ebb tidal variations in nutrient concentrations were likely influenced by physical and biological characteristics, with tidal forcing playing a significant role in controlling temporal variations in these components.
JOURNAL OF MARINE SYSTEMS
(2022)
Article
Environmental Sciences
Qinsheng Wei, Yongquan Yuan, Shuqun Song, Yuhang Zhao, Junchuan Sun, Caiwen Li, Baodong Wang
Summary: This study reveals the mechanisms controlling the spatial variability and heterogeneity of summer hypoxia in the Changjiang Estuary based on observational data. Factors such as river plume, stratification, front, upwelling, and phytoplankton biomass contribute to the spatial morphology and scope of hypoxia.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Yongguo Li, Xiangyan Li, Caiyin Xu, Xuan Tang
Summary: Water ecology is crucial for environmental protection, and the combination of human activities and natural factors has led to eutrophication in the Yangtze estuary and surrounding waters. Dissolved oxygen (DO) concentration, a key indicator of water quality, is predicted in Shanghai's Yangtze River basin using the least squares support vector machine (LSSVM) with improved particle swarm optimization (IPSO). Eight parameters including water temperature, pH, potassium permanganate, ammonia nitrogen, total phosphorus, total nitrogen, conductivity, and nephelometric turbidity unit are selected as inputs, and the output is dissolved oxygen concentration. The model shows improved accuracy and stability in predicting DO concentrations, providing technical support for assessing and monitoring offshore water quality.
Article
Environmental Sciences
Wenxuan He, Sizhen Liu, Zhichen Jiang, Jinshui Zheng, Xuegang Li, Dechao Zhang
Summary: The study isolated nitrate-utilizing bacteria in the oxygen minimum zone of the Changjiang Estuary, revealing microbial diversity, nitrogen metabolism, and nitrate reduction capabilities. It highlights the potential for utilizing nitrate and nitrite as electron acceptors to generate ammonia, providing insights into the role of these bacteria in the nitrogen cycle within the OMZ.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Engineering, Civil
Yaying Lou, Zhijun Dai, Chuqi Long, Hui Dong, Wen Wei, Zhenming Ge
Summary: This study used remote sensing images to monitor the dynamics of salt marshes in the largest wetland in the Yangtze River Delta. The results showed significant expansion and accretion of salt marshes, with adjacent mudflats remaining relatively unchanged. The seaward expansion of mudflats provided space for salt marsh growth and promoted their expansion.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
C. Juez, N. Garijo, M. A. Hassan, E. Nadal-Romero
Summary: In this study, wavelet transformation method was used to analyze data from over 50 years at the Pingshan station on the Upper Changjiang River in order to identify the time-scale dependency of suspended sediment patterns. Short time scales are driven by climatic factors, while long time scales are controlled by high flow events and sediment storage within the river reach.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Kuifeng Luan, Hui Li, Yujia Pan, Zhenhua Wang, Hang Xu, Weidong Zhu, Jie Wang, Haixia Wan, Xinyi You
Summary: This study analyzed the distribution characteristics and vertical profile characteristics of suspended sediment concentration (SSC) in the Yangtze River Estuary and its adjacent waters under different tidal current states. It verified the applicability of the Rouse and Soulsby models in the study area and provided theoretical basis for marine forecasting, analysis, and evaluation. The study is important for scientific research and management of mudflat resources.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Engineering, Marine
Hui Shen, Ye Zhu, Zhiguo He, Li Li, Yingzhong Lou
Summary: The freshwater plume at the Changjiang River mouth has significant impacts on coastal water quality and ecosystems. Research shows that the Changjiang River discharge affects sea temperature, fronts, and thermal stratification in coastal zones. These effects vary spatially and seasonally.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Fang Cao, Shouye Yang, Chengfan Yang, Yulong Guo, Lei Bi, Yuze Li
Summary: Continental weathering plays a crucial role in regulating global biogeochemical cycle and climate change. This study utilizes elemental and lithium isotope compositions to quantitatively estimate the proportions of different components in sediments from the Changjiang Estuary, providing insights into silicate weathering processes.
SCIENCE CHINA-EARTH SCIENCES
(2021)