Joint effect of aquaculture and land reclamation on sediment dynamics
Study region: Sansha Bay, China Study focus: The rapid development of global coastal aquaculture and land reclamation are significantly changing the offshore sediment dynamics system. Based on remote sensing, in-situ observation, digital elevation models and numerical simulation, the research survey...
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Elsevier
2025-08-01
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| Series: | Journal of Hydrology: Regional Studies |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581825003866 |
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| author | Huikun Yao Maotian Li Xiaoqiang Liu Weihua Li Yan Song Jing Chen Yan Liu Jianwei Zeng Pieter C. Roos |
| author_facet | Huikun Yao Maotian Li Xiaoqiang Liu Weihua Li Yan Song Jing Chen Yan Liu Jianwei Zeng Pieter C. Roos |
| author_sort | Huikun Yao |
| collection | DOAJ |
| description | Study region: Sansha Bay, China Study focus: The rapid development of global coastal aquaculture and land reclamation are significantly changing the offshore sediment dynamics system. Based on remote sensing, in-situ observation, digital elevation models and numerical simulation, the research surveyed and simulated changes in aquaculture and land reclamation areas, their effects on sediment dynamics, and the resulting bed erosion/deposition in Sansha Bay from 2005 to 2020. New hydrological insights for the region:From 2005–2020, aquaculture and land reclamation areas increased from 6.2 km2 and 16.5 km2 to 154 km2 and 55.3 km2, respectively. In the subtidal area, the sharp increase in aquaculture area dominated the changes in sediment dynamics, altering the vertical velocity profile from a logarithmic to bow shape due to double boundary effect of top aquaculture and bottom bed. This effect shifted maximum velocity layer downward to 0.4–0.6H and the average bottom velocity increased by 10 %, the bottom suspended sediment concentration (SSC) increased 26 %, resulting in a 102 % increase in bed erosion. While in intertidal flat, increased land reclamation dominated the changes in sediment dynamics and weakened the hydrodynamics due to dam reflection effect. This effect decreased bottom velocity by 15 % and SSC by 22 %, resulting in a 153 % increase in bed deposition. This study provides a reference case for the impact of offshore aquaculture and land reclamation on sediment dynamics. |
| format | Article |
| id | doaj-art-f617ec3fc73b4f88bc0bcf682f02caa1 |
| institution | DOAJ |
| issn | 2214-5818 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Hydrology: Regional Studies |
| spelling | doaj-art-f617ec3fc73b4f88bc0bcf682f02caa12025-08-20T02:50:03ZengElsevierJournal of Hydrology: Regional Studies2214-58182025-08-016010256110.1016/j.ejrh.2025.102561Joint effect of aquaculture and land reclamation on sediment dynamicsHuikun Yao0Maotian Li1Xiaoqiang Liu2Weihua Li3Yan Song4Jing Chen5Yan Liu6Jianwei Zeng7Pieter C. Roos8State key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, ChinaState key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China; Corresponding author.DHI China, Shanghai 200235, ChinaState key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, ChinaState key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, ChinaState key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, ChinaState key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, ChinaNanjing Center, China Geological Survey, Nanjing 210016, ChinaWater Engineering and Management, University of Twente, Enschede, the NetherlandsStudy region: Sansha Bay, China Study focus: The rapid development of global coastal aquaculture and land reclamation are significantly changing the offshore sediment dynamics system. Based on remote sensing, in-situ observation, digital elevation models and numerical simulation, the research surveyed and simulated changes in aquaculture and land reclamation areas, their effects on sediment dynamics, and the resulting bed erosion/deposition in Sansha Bay from 2005 to 2020. New hydrological insights for the region:From 2005–2020, aquaculture and land reclamation areas increased from 6.2 km2 and 16.5 km2 to 154 km2 and 55.3 km2, respectively. In the subtidal area, the sharp increase in aquaculture area dominated the changes in sediment dynamics, altering the vertical velocity profile from a logarithmic to bow shape due to double boundary effect of top aquaculture and bottom bed. This effect shifted maximum velocity layer downward to 0.4–0.6H and the average bottom velocity increased by 10 %, the bottom suspended sediment concentration (SSC) increased 26 %, resulting in a 102 % increase in bed erosion. While in intertidal flat, increased land reclamation dominated the changes in sediment dynamics and weakened the hydrodynamics due to dam reflection effect. This effect decreased bottom velocity by 15 % and SSC by 22 %, resulting in a 153 % increase in bed deposition. This study provides a reference case for the impact of offshore aquaculture and land reclamation on sediment dynamics.http://www.sciencedirect.com/science/article/pii/S2214581825003866Sansha BayAquaculture and land reclamationNumerical simulationTidal flow profilesSediment dynamicsErosion and deposition |
| spellingShingle | Huikun Yao Maotian Li Xiaoqiang Liu Weihua Li Yan Song Jing Chen Yan Liu Jianwei Zeng Pieter C. Roos Joint effect of aquaculture and land reclamation on sediment dynamics Journal of Hydrology: Regional Studies Sansha Bay Aquaculture and land reclamation Numerical simulation Tidal flow profiles Sediment dynamics Erosion and deposition |
| title | Joint effect of aquaculture and land reclamation on sediment dynamics |
| title_full | Joint effect of aquaculture and land reclamation on sediment dynamics |
| title_fullStr | Joint effect of aquaculture and land reclamation on sediment dynamics |
| title_full_unstemmed | Joint effect of aquaculture and land reclamation on sediment dynamics |
| title_short | Joint effect of aquaculture and land reclamation on sediment dynamics |
| title_sort | joint effect of aquaculture and land reclamation on sediment dynamics |
| topic | Sansha Bay Aquaculture and land reclamation Numerical simulation Tidal flow profiles Sediment dynamics Erosion and deposition |
| url | http://www.sciencedirect.com/science/article/pii/S2214581825003866 |
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