海洋地质与第四纪地质2025，Vol.45Issue(2)：43-54,12.DOI:10.16562/j.cnki.0256-1492.2023102101
北部湾大风江河口沙嘴动态变化过程
Dynamic variation of sand spit in the Dafeng River estuary,Beibu Gulf
摘要
Abstract
The rapid change process of sand spit is directly related to the estuarine geomorphological migration with potential impacts on water and sediment exchange between land and sea.The movement and the driving mechanism of sand spit landform have received especial concerns.However,limited information is related to sand spit morphodynamics due to difficulties in obtaining monitoring data.Based on multi-satellite remote sensing images from 1990 to 2023,surface sediments collected in November 2022,and regional hydrological data,the evolution of the sand spit in Dafeng River estuary in Beibu Gulf,Guangxi,SW China over a medium-strong tidal environment were analyzed.Results show that①the sand spit in the estuary exhibited continuous extension to the northwest,and the width and area of the spit featured seasonal variation with increased width in flood season and decreases in dry season;②The main sediment source of the sand spit was from riverine material in flood season.The average grain size of sediments on top the spit seaside was the coarsest and then gradually became finer from sea to land,and to the middle and tail parts of the spit.The sediments were transported mainly from the top of the sediments seaside towards the middle and tail of the spit,so that the spit continued to extend northwestward;③Runoff from sand is the source of sediment in the spit,waves are the main factor controlling the long-term morphological evolution of the sand spit in the estuary.Tidal actions in mild-strong tidal environment are the driver to the sediment transport shoreward and the continuous northwestward extension of the sand spit.The significant difference in seasonal runoff was the main factor on the variations in width and area of the sand spit:greater in flood season and smaller in dry season.关键词
沉积物/遥感影像/河口沙嘴/大风江河口/北部湾Key words
sediment/remote sensing images/sand spit/Dafeng River estuary/Beibu Gulf分类
海洋学引用本文复制引用
陈益,戴志军,庞文鸿,梁喜幸,罗杰骏,熊媛..北部湾大风江河口沙嘴动态变化过程[J].海洋地质与第四纪地质,2025,45(2):43-54,12.基金项目
国家自然科学重点基金"北部湾红树林潮滩响应陆海水沙变化的沉积动力过程"(41930537) （41930537）
