摘要
近底悬沙浓度的确定对于研究床面泥沙的起动和输移具有十分重要的意义。基于双尾翼近底悬沙采样系统,选择徐六泾断面浅滩和深槽,在洪、枯季水文监测期间同步采集了距河床50 cm和10 cm的水样。现场实测资料分析表明:①浅滩和深槽含沙量垂向分布规律不同,浅滩泥沙粒径较粗且越靠近河床泥沙越粗,含沙量垂向分布呈“L”形,中上层水体含沙量变化较小,越靠近河床含沙量变化越大;深槽泥沙粒径较细,含沙量垂向分布较为均匀。②近底悬沙对浅滩和深槽的测验成果影响程度不同,计入近底悬沙后,浅滩处平均含沙量平均增幅为7.37%,深槽处平均增幅小于1%。③近底悬沙对测验成果的影响程度在时间尺度上有差异,计入近底悬沙后,含沙量一般情况下是增大的,但增幅不同,枯季大于洪季,落潮大于涨潮,大潮大于小潮。
Determination of near-bed suspended sediment concentration is of great significance for the study of bed sediment initiation and transport.In this paper,based on the double-tailed near-bed suspended sediment sampling system,water samples of 50cm and 10cm from the riverbed were collected synchronously during the flood and dry seasons in the shallow shoal and deep channel of Xuliujing profile.The results showed that the vertical distribution of sediment concentration in shallow shoal and deep channel are different.The sediment particle size of shoal is larger,and the closer to the river bed,the coarser the sediment is,and the vertical distribution of sediment concentration is L-shaped;the sediment concentration in the middle and upper water bodies changes little,and the closer to the river bed,the greater the change of sediment concentration.The sediment particle size of deep channel is relatively small,and the vertical distribution of sediment concentration is relatively uniform.Whether or not the near-bed suspended sediment is considered has different effects on the test results of the shallow shoal and the deep channel.After considering the near-bed suspended sediment,the average increase of tidal sediment concentration at the shallow shoal was 7.37%,and the average increase at the deep channel was less than 1%.The influence of near-bed suspended sediment on the test results varies with time.After considering the near-bed suspended sediment,the sediment concentration generally increases,but the increase amplitude is different.The increase amplitude of sediment concentration in the dry season is greater than that in the flood season.The increase amplitude of sediment concentration of the ebb tide is greater than that of the flood tide.The increase amplitude of sediment concentration of the spring tide is greater than that of the neap tide.
作者
刘传杰
朱巧云
LIU Chuanjie;ZHU Qiaoyun(Changjiang River Estuary Bureau of Hydrological and Water Resources Survey,Bureau of Hydrology of Changjiang Water Resources Commission,Shanghai 200136,China)
出处
《人民长江》
北大核心
2022年第9期87-93,101,共8页
Yangtze River
基金
国家自然科学基金项目(U2040203)。
关键词
近底悬沙
悬沙浓度
双尾翼近底悬沙采样系统
浅滩
深槽
徐六泾断面
near-bed suspended sediment
sediment concentration
double-tailed near-bed suspended sediment sampling system
shallow shoal
deep channel
Xuliujing profile
