黄河口潮滩泥沙絮凝研究  

Study of sediment flocculation in tidal flat of Huanghe River Estuary

作　　者：于上 谢卫明 何青[1] 王宪业 赵中豪 郭磊城 徐凡 Yu Shang;Xie Weiming;He Qing;Wang Xianye;Zhao Zhonghao;Guo Leicheng;Xu Fan(State Key Lab of Estuarine and Coastal Research,East China Normal University,Shanghai 200041,China)

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200041

出　　处：《海洋学报》2022年第11期99-110,共12页

基　　金：国家自然科学基金重点项目(51739005,51909101,42006150,41876091,U2040216);科技部国际科技创新合作重点项目(2016YFE0133700)。

摘　　要：本文基于现场观测的絮团粒径、悬沙浓度及水动力数据,研究了黄河口南部潮滩泥沙絮凝特征。研究发现,黄河口潮滩絮团粒径在25.42~264.44μm之间,平均为95.20μm。水体紊动对黄河口潮滩絮凝的影响存在差异,紊动对絮凝促进作用的上限约为G=3.76 s。紊动强度低于G时,紊动促进泥沙絮凝,絮团粒径随紊动加强而增大;反之水体紊动对絮凝主要起抑制作用,絮团粒径随紊动强度增大而减小。悬沙浓度对黄河口潮滩泥沙絮凝起抑制作用,同等紊动条件下高悬沙浓度对应的絮团粒径更小。黄河口潮滩絮团有效密度与粒径呈现负相关关系,沉速主要受粒径影响。本研究补充了对弱潮河口潮滩泥沙絮凝特性的认识。Based on the field data of floc size,suspended sediment concentration and hydrodynamic data,the flocculation characteristics of tidal flat in the south of the Huanghe River Estuary are studied.The results show that the floc size of Huanghe River Estuary tidal flat range is 25.42–264.44μm,and the average diameter is 95.20μm.The effect of water turbulence on the flocculation of tidal flat at the Huanghe River Estuary is different,and the upper limit of turbulence on flocculation promotion is about G=3.76 s.While the turbulence intensity of water is lower than Gl,turbulence promotes sediment flocculation,and the particle size of floc increases with the strengthen of turbulence intensity,whereas the turbulence mainly inhibits flocculation,the particle size of floc decreases with the attenuate of turbulence intensity.The suspended sediment concentration inhibits the flocculation,particle size of floc corresponding to high sediment content under the same turbulent conditions is smaller.There is a negative correlation between the effective density and the particle size of the floc,and the settling speed of the floc is mainly affected by the particle size.This study complements the understanding of sediment flocculation characteristics in tidal flat of weak tidal estuary.

关 键 词：泥沙 絮凝 潮滩 黄河口 

分 类 号：TV142.1[水利工程—水力学及河流动力学]