【摘要】 香洲湾地处河口、海岛、岬角交汇区，其沉积环境的演化对海岸带可持续发展至关重要。本研究旨在揭示香洲湾海域表层沉积物的分布与输运规律，通过实测数据和粒径趋势分析，首次计算了该海域泥沙起动流速、再悬浮与输运通量，并分析了控制因素。研究发现，香洲湾表层沉积物粉砂和黏土占比超82%，整体以细颗粒为主，局部粗颗粒点缀，分选性极好。泥沙起动流速为32～57 cm/s，潮流易致泥沙再悬浮，日再悬浮量为58.72～151.87 kg/m~2。香洲湾海域表层沉积物的日净输运通量为东北侧高于东南侧，分别呈现落潮和涨潮的输沙趋势，野狸岛东南为泥沙汇聚中心，沉积动力环境复杂。研究表明，珠江径流、伶仃洋底质再悬浮及海洋工程是泥沙的主要来源，其输运受潮流、波浪、径流及人类活动的影响。更多还原

【Abstract】 Located at the confluence of an estuary, islands, and headlands, the sedimentary environment of Xiangzhou Bay is critical for coastal sustainability. This study aims to elucidate the distribution and transport patterns of surface sediments in Xiangzhou Bay. Based on in-situ data and grain-size trend analysis, we calculated, for the first time, the sediment starting velocity, resuspension flux, and transport flux in the area, and analyzed the controlling factors. The results show that silt and clay dominate the surface sediments(over 82%),exhibiting an overall fine-grained composition with localized coarser patches, and excellent sorting. The sediment starting velocity ranges from 32 cm/s to 57 cm/s, indicating that tidal currents readily induce sediment resuspension, with a daily resuspension flux from 58.72 kg/m~2 to 151.87 kg/m~2. The daily net transport flux of surface sediments in Xiangzhou Bay is higher on the northeast side than on the southeast side., exhibiting ebband flood-dominated transport trends, respectively, with a sediment convergence zone forming southeast of Yeli Island. The sedimentary dynamic environment is complex. This study suggests that sediment sources are primarily from the Pearl River, resuspension of sediments from the bottom of Lingdingyang Bay, and coastal engineering activities. Sediment transport is influenced by tides, waves, river runoff, and human activities.更多还原