Combined effects of massive reclamation and dredging on the variations in hydrodynamic and sediment transport in Lingdingyang Estuary,China  

作　　者：Kanglin CHEN Yitong LIN Jing LIU Zixiao HE Liangwen JIA 

机构地区：[1]School of Geography and Remote Sensing,Guangzhou University,Guangzhou 510006,China [2]School of Marine Science,Sun Yat-Sen University,Guangzhou 510275,China [3]School of Marine Engineering and Technology,Sun Yat-Sen University,Guangzhou 510275,China [4]Southern Marine Science and Engineering,Guangdong Laboratory(Zhuhai),Zhuhai 519080,China [5]Guangdong Province Engineering Research Center of Coasts,Islands and Reefs,Guangzhou 510275,China

出　　处：《Frontiers of Earth Science》2024年第1期127-147,共21页地球科学前沿（英文版）

基　　金：funded by the National Natural Science Foundation of China(Grant Nos.42201104,41376101,and 42071123);China Postdoctoral Research Foundation(Grant No.2023M730758);Guangdong Provincial Special Key Project of Six Marine Industries in 2022“Research on Three-dimensional Efficient Utilization of Marine Spatial Resources in Guangdong-Hong Kong-Macao Greater Bay Area”([2022]49).

摘　　要：Anthropogenic disturbances associated with the rapid development of coastal cities have drastically influenced the hydrodynamics and sediment transport processes in many large estuaries globally.Lingdingyang Estuary(LE),located in the central and southern part of the Pearl River Delta,southern China with a long history of high-intensity anthropogenic disturbances,was studied to explore the contribution rate and mechanism underlying the alteration in hydrodynamics and sediment transport under each phase of human activity.A state-of-the-art modeling tool(TELEMAC-2D),was used to study the variations in the hydrodynamics and sediment transport,accounting for reclamation-induced shoreline and dredging-induced topography changes.The results indicated that:i)under the influence of successive land reclamation,the general distribution of the Confluence Hydrodynamic Zone(CHZ)in LE varied from scattered to concentrated,and these zones moved 3–5 km seaward.ii)Large-scale channel dredging weakened the residual flow in LE,decreasing the residual flow in the Inner-Lingding Estuary(ILE)by 62.45%.This was initiated by the enhancement of tidal dynamics through changes in the bottom friction caused by dredging in the ILE.In contrast,massive reclamation decreased the residual flow in the ILE by 17.55%and increased that in the Outer-Lingding Estuary(OLE).iii)Despite disturbances related to land reclamation and dredging,the estuarine jet flow in LE remained a turbulent jet system,and the estuarine jet flow became more asymmetrical.In addition,the position of the estuarine jet source moved 6–13 km seaward.iv)Both reclamation and dredging decreased the SSC in the ILE and increased the SSC in the OLE.Reclamation weakened the SSC in the ILE by 62.19%,whereas dredging enhanced the SSC in the OLE by 49%.Spatially,reclamation resulted in an increase in the SSC near the outlets and a decrease in the SSC in the northern portion of the Western Channel.Dredging mainly increased the SSC in the northern part of the OLE.v)The increase in the ba

关 键 词：reclamation and dredging estuarine jet flow dynamics and sediment transport mechanism Lingdingyang Estuary 

分 类 号：P333[天文地球—水文科学] TV14[水利工程—水文学及水资源]