摘要
针对台风过境期间伶仃洋潮流悬移质变化特征及其机理,根据珠江河口原型观测站在“山竹”台风期间的实测气象和水文数据,对比分析台风过境前与过境期间伶仃洋流速流向、波高和含沙量的变化特征。通过计算波浪剪切应力与波-流联合剪切应力,分析悬移质与波浪和潮流的响应机制。研究结果显示,台风期间的风、潮流、波浪、含沙量和输沙量较平常条件时呈倍数增长,水域的平面流速分布和垂向流速结构均发生明显改变。波-流联合剪切应力与含沙量呈明显正相关,受台风影响,波-流联合剪切应力急剧增大,掀起河床底部泥沙颗粒,是水体含沙量快速增大的主要原因。
Based on the meteorological and hydrological data measured by the prototype observation station of the Pearl River Estuary during the Typhoon Mangkhut,the variation characteristics of velocity,direction,wave height and sediment concentration in the Lingding Bay before and during the transit of typhoon are compared and analyzed.By calculating wave shear stress and wave current combined shear stress,the response mechanism of suspended sediment to wave and tide is analyzed.The results show that the wind,tide,wave,suspended sediment concentration and sediment transport increased in multiples during the typhoon,compared with the usual.The plane velocity distribution and vertical velocity structure of the water area changed significantly.The wave current combined shear stress shows a significant positive correlation with the sediment concentration.Under the influence of typhoon,the combined wave current shear stress increases sharply and raises the sediment particles at the bottom of the riverbed,which is the main reason for the rapid increase of suspended sediment concentration.
作者
杨裕桂
卢陈
吴尧
袁菲
YANG Yu-gui;LU Chen;WU Yao;YUAN Fei(Pearl River Water Resources Research Institute,Pearl River Water Resources Commission,Guangzhou 510611,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2022年第5期30-36,共7页
Journal of Sediment Research
基金
国家自然科学基金青年基金项目(42006157)
水文水资源与水利工程科学国家重点实验室“一带一路”水与可持续发展科技基金项目(2020492111)
流域水治理重大关键技术研究项目([2022]YF001)。
关键词
台风
悬移质
波-流联合剪切应力
伶仃洋
typhoon
suspended sediment
combined wave current shear stress
Lingding Bay
作者简介
杨裕桂(1990-),男,广东佛山人,工程师,硕士,主要从事河口治理工程泥沙方面研究。E-mail:494151328@qq.com。
