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Wang L, Lei X, Yuehua G, Zhou Y, Han JC, Huang Y, Li B, Mao XZ, Tang Z. A novel method of identifying estuary high-nutrient zones for water quality management. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169578. [PMID: 38154631 DOI: 10.1016/j.scitotenv.2023.169578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 11/13/2023] [Accepted: 12/19/2023] [Indexed: 12/30/2023]
Abstract
Coastal shallow waters are highly vulnerable to pollution, often leading to the development of intricate eutrophication zones. However, accurately determining these areas poses a significant challenge due to the complex interplay of estuarine hydrodynamics and nutrient transformation. To address such issue, a novel method was proposed to identify high-nutrient zones through calculating the continuous zonation of released tracers when their instantaneous concentrations declined to 1/e of their initial values. The method was well tested using idealized estuary models with varying shape parameters, water depths and river discharges. The results consistently revealed that the boundaries of high-nutrient zones fell within the mixed zone, characterized by salinity levels of 10- 20 psu. In Shenzhen Bay, a typical shallow bay, distinct differences were observed in the concentrations of dissolved inorganic nitrogen (DIN) and PO43-. Both the 20 psu isohaline and the proposed method effectively identified the partition boundary of high DIN and PO43- in 2001-2010, but only the newly proposed method demonstrated accuracy in delineating the actual high-nutrient zone during the continuous nutrient reduction period from 2010 to 2020. This study provides a practical and feasible approach that can serve as an auxiliary decision-making tool for managing estuarine water environments, and it has potential to facilitate the implementation of timely and effective measures for pollution control.
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Affiliation(s)
- Linlin Wang
- Water Science and Environmental Engineering Research Center, College of Chemical and Environmental Engineering, Shenzhen University, Shenzhen 518060, China; State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
| | - Xiaoyu Lei
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Guo Yuehua
- CCCC First Navigation Bureau Ecological Engineering Co., Ltd., Shenzhen 518107, China
| | - Yang Zhou
- Water Science and Environmental Engineering Research Center, College of Chemical and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Jing-Cheng Han
- Water Science and Environmental Engineering Research Center, College of Chemical and Environmental Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Yuefei Huang
- State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China; Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China
| | - Bing Li
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Xian-Zhong Mao
- Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
| | - Zhaozhao Tang
- Water Science and Environmental Engineering Research Center, College of Chemical and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
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Wang Z, Liu K. Nutrients transport behavior in inlet river in the Yellow River Delta in winter. MARINE POLLUTION BULLETIN 2023; 197:115815. [PMID: 37984090 DOI: 10.1016/j.marpolbul.2023.115815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 11/12/2023] [Accepted: 11/15/2023] [Indexed: 11/22/2023]
Abstract
The nutrients such as dissolved inorganic nitrogen (DIN, NH4+-N, NO2--N, and NO3--N), dissolved inorganic phosphorus (DIP, PO43-) and dissolved SiO2 (DSi) funneled by the inlet river are the dominant factors to coastal eutrophication. This study investigated nutrient transport process in typical inlet rivers in the Yellow River Delta. The indicator of coastal eutrophication potential and concentration ratio between upstream and downstream stations were used to evaluate the influence of different sources to the nutrient risks. It showed that urban areas are the most important source of the nutrients in studied rivers. The harbor and mariculture would have greater risk because of their proximity close to the coastal area. Wetland was a vital conversion to eliminate the river nutrients, and the retention could reach 80 %. It is imperative to protect and construct wetlands to reduce the nutrient pollution in the inlet river.
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Affiliation(s)
- Zhaohua Wang
- First Institute of Oceanography, MNR, Qingdao 266061, China
| | - Kai Liu
- Dongying Marine Development Research Institute, Dongying 257091, China.
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Shi B, Sun J, Cao Y, Yang F, Wu Y, Liang X, Li L. Application of vacuum sealing drainage to the treatment of seawater-immersed blast-injury wounds. Int Wound J 2015; 13:1198-1205. [PMID: 25951775 DOI: 10.1111/iwj.12444] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2014] [Accepted: 02/27/2015] [Indexed: 12/18/2022] Open
Abstract
The aims of this study were to observe the effects of vacuum sealing drainage (VSD) with three different negative pressures on the wound healing rate, macrophage count and the expression of hyaluronic acid (HA) as well as its receptor CD44 in seawater-immersed blast-injury wounds (SIBIW) and to determine the optimal negative pressure value. In a minipig SIBIW model, different suction pressures and routine dressing were applied. Histological and immunohistochemical comparisons as well as molecular biology methods were performed to compare the wound healing conditions, macrophage count and the levels of HA and CD44. The wound healing rate of the VSD group was significantly higher than that of the control group, with the -120 mmHg group exhibiting the best effects. The macrophage count of the VSD group was higher than that of the control group. The HA level fluctuation was higher in the VSD group, with the -120 mmHg and the -180 mmHg groups showing the most significant fluctuation (P < 0·05). CD44 was expressed in the full-thickness wound-limbic tissues and was higher in the treatment group than that in the control group, with the -120 mmHg group having the most obvious expression. VSD significantly improved the healing ability and increased the macrophage count and the HA content. It also promoted CD44 expression. -120 mmHg is the optimal negative pressure value.
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Affiliation(s)
- Bing Shi
- Department of Plastic and Aesthetic Surgery, The 309th Hospital of PLA, Beijing, China
| | - Jingjing Sun
- Department of Plastic and Aesthetic Surgery, The 309th Hospital of PLA, Beijing, China
| | - Yingli Cao
- Department of Plastic and Aesthetic Surgery, The 309th Hospital of PLA, Beijing, China
| | - Fen Yang
- Department of Plastic and Aesthetic Surgery, The 309th Hospital of PLA, Beijing, China
| | - Yujia Wu
- Department of Plastic and Aesthetic Surgery, The 309th Hospital of PLA, Beijing, China
| | - Xianping Liang
- Department of Plastic and Aesthetic Surgery, The 309th Hospital of PLA, Beijing, China
| | - Li Li
- Department of Plastic and Aesthetic Surgery, The 309th Hospital of PLA, Beijing, China
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Garcia JC, Ketover RDJ, Loh AN, Parsons ML, Urakawa H. Influence of freshwater discharge on the microbial degradation processes of dissolved organic nitrogen in a subtropical estuary. Antonie van Leeuwenhoek 2014; 107:613-32. [DOI: 10.1007/s10482-014-0357-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 12/12/2014] [Indexed: 10/24/2022]
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