人民珠江2025，Vol.46Issue(12)：61-70,10.DOI:10.3969/j.issn.1001-9235.2025.12.007
涉水工程建设悬沙输移影响遥感后评估
Impact of Suspended Sediment Transport from Marine Construction Using Remote Sensing:A Post-Project Assessment of the Shenzhen-Zhongshan Link
摘要
Abstract
Quantitative assessment of the impact of marine construction projects on suspended sediment transport and diffusion in estuaries is crucial for flood control,post-project evaluations,and estuarine ecological protection.This paper proposed a technical framework of"remote sensing inversion,path extraction,and phase comparison"and a zonal and block-optimized computational methodology,which accounted for variations in hydrodynamic conditions and differences in suspended sediment diffusion,effectively reducing cross-interference.This paper focused on the Shenzhen-Zhongshan Link as a case study.Using multi-temporal Landsat and Sentinel-2 satellite imagery,the paper employed remote sensing quantitative inversion to retrieve suspended sediment concentration(SSC),and an analysis method based on geometric features of SSC contours was applied to extract information about sediment plumes.In the study area,the suspended sediment diffusion was compressed by the freshwater discharge from the Shiziyang,resulting in a sharp gradient in the concentration isolines at the diffusion boundary.Concurrently,the diffusion exhibited anisotropy under flow action,characterized by downstream-dominated transport and outwardly convex isolines.Based on these characteristics,the plume front position was extracted to determine the diffusion extent.Furthermore,the geometric center of the isolines was computed,and a weighted principal component analysis was employed to derive the principal axis direction,thereby identifying the overall diffusion direction.The spatial extent and direction of suspended sediment diffusion before and after the project's construction were extracted from six satellite images captured at typical tidal levels(covering 2014-2016 pre-construction and 2020-2024 post-construction)along with DEM topographic data from 2011 to 2019.A comparative analysis of the extraction results was conducted.Key findings reveal enhanced southeastward diffusion intensity and expanded plume extent at Hengmen,Hongqimen,and Jiaomen's southern extension,increased diffusion angle south of the project with a south-eastward directional bias,and distinct morphological changes in sediment plume geometry post-construction.Following the completion of the project,a net increase exceeding 12 square kilometers in suspended sediment dispersion area is observed,accompanied by a northward deflection in the dispersion pattern of approximately 23 degrees.This research provides critical technical support for ecological impact assessment and integrated management of major engineering projects in the Pearl River Estuary.关键词
涉水工程/悬沙输移/遥感反演/后评估/珠江河口Key words
marine construction/suspended sediment transport/remote sensing inversion/post-project assessment/Pearl River Estuary分类
建筑与水利引用本文复制引用
高利华,潘洪洲,何颖清,张嘉珊..涉水工程建设悬沙输移影响遥感后评估[J].人民珠江,2025,46(12):61-70,10.基金项目
国家自然科学基金面上项目(42271334) （42271334）
珠科院科技创新自立项目([2023]YF005) （[2023]YF005）
