摘要
利用长江口人类活动强干扰下的海图水深数据及河槽表层沉积物资料,探讨近期长江河口主槽冲淤变化与沉积物分布特征,研究结果表明,在流域来水量变化不明显,来沙量锐减的情况下,长江河口段中上游主槽整体上处于微冲刷环境。而又受深水航道治理工程的影响,局部河段主槽出现淤积,沉积物粒径也发生相应的变化。其中,南支下段宝山水道总体上受到冲刷,沉积物枯季变细,洪季变粗;南槽航道上段、北港航道和横沙通道均受到冲刷,沉积物均逐渐变粗;南港航道、与北槽过渡河段的圆圆沙航槽和北槽航道主槽淤积,沉积物均逐渐变细,且三者的淤积均由航道回淤造成,南港航道回淤的沉积物粒径最粗(0.12mm左右),圆圆沙次之(0.07mm左右),北槽最小(0.02mm左右)。
Based on the chart date and surface sediment samples within maintenance dredging period of the Yangtze Estuary Deepwater Channel Regulation, the recent morphological processes and surface sediment distribution of the Yangtze Estuary are studied. The results show that the main channels are scoured generally. Under the influence of the Yangtze Estuary Deepwater Channel Regulation, the morphological processes have a new adjustment in recent and the surface sediment distribution is also variation accordingly. The Baoshan waterways subject to scour, the grain size of the surface sediment was gradually finer in dry season and was gradually coarser in flood season. The main channel of the Hengsha passage, the north channel and the upper reach of south passage subject to scour, and the grain size of the surface sediment was gradually coarser. The deposition of the Waigaoqiao channel, Yuanyuansha channel and the north passage were caused by siltation. The grain size of the surface sediment on Waigaoqiao channel was most coarser （0. 15mm） , the next was Yuanyuansha （0.07mm） , and the finest was north passage （0.02mm）.
出处
《泥沙研究》
CSCD
北大核心
2015年第6期52-58,共7页
Journal of Sediment Research
基金
国家自然科学基金项目(41476075)
国家自然科学基金中荷合作专项(51061130544)
关键词
长江口
主槽
冲淤变化
沉积物
Yangtze Estuary
main channel
sediment distribution
morphological processes
