2016-2020年黄河三角洲尾闾河道悬浮泥沙时空分布  

Spatiotemporal distribution of suspended sediment in the tail channel of the Huanghe River Delta from 2016 to 2020

作　　者：黄梁 陈沈良[1] 李鹏[1] 杨美晴 刘清兰 HUANG Liang;CHEN Sheniang;LI Peng;YANG Meiqing;LIU Qinglan(State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,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200241

出　　处：《海洋通报》2023年第3期303-313,共11页Marine Science Bulletin

基　　金：国家自然科学基金(U1706214);河口海岸学国家重点实验室开放课题(SKLEC-KF202001)。

摘　　要：三角洲河道悬浮泥沙的时空分布与河口流路稳定性及水下三角洲发育密切相关。基于Sentinel-2高分辨率卫星影像反演悬沙浓度,结合河道形态和水动力数值模拟,分析了近年来黄河尾闾河道悬沙的时空分布特征和影响因素。结果表明:2016-2020年,黄河尾闾河道平均悬沙浓度具有显著的洪枯季差异和不同的沿程分布;洪季悬沙浓度受上游来沙和底沙起动共同控制,王家庄和清加2断面是底沙起动再悬浮的主要断面;径流流速的增大对不同河段悬沙浓度的影响不尽相同,河口段悬沙浓度更易受径流流速的影响;以王家庄断面为界,上下游悬沙浓度分别呈现“深泓低两岸高”和“深泓高两岸低”两种截然不同的分布模式;尾闾河道悬沙浓度对调水调沙响应敏感,2018年调水调沙期间悬沙浓度达到10.75 g/L,但随着河床底沙粗化,尾闾河道悬沙浓度对调水调沙的响应敏感性下降。The temporal and spatial distribution of suspended sediment in delta distributary channels is closely related to the stabilization of river course and development of subaqueous delta.Based on the retrieval of suspended sediment con‐centration(SSC)from Sentinel-2 high-resolution satellite imagery,combined with the river morphology and hydrody‐namic numerical simulation,the spatiotemporal distribution characteristics and influencing factors of suspended sedi‐ment in the Huanghe River tail channel in recent years are examined.The results show that during 2016-2020,the av‐erage SSC has significant differences in flood and dry seasons and different distributions along the tail channel.The SSC in flood season is jointly controlled by upstream incoming sediment and bottom sediment incipient motion.The main sec‐tions of bottom sediment incipient motion and resuspension are the Wangjiazhuang and Qingjia 2 sections.The influence of runoff velocity on SSC in different river sections is different,and the SSC in the river mouth reach is more susceptible to runoff velocity.Taking the Wangjiazhuang section as the boundary,the suspended sediment concentration in the upper and lower reaches presents two completely different distribution modes,namely,´high on both sides of low thalwegth´and´low on both sides of high thalwegth´;the SSC in the tail channel is sensitive to the response of the Water-Sediment Regulation Scheme(WSRS).During the WSRS in 2018,the SSC reached 10.75 g/L.However,with the coarsening of riv‐erbed sediment,the sensitivity of SSC in the tail channel to the response of WSRS decreases.

关 键 词：尾闾河道 悬浮泥沙 调水调沙 时空分布 

分 类 号：P737.14[天文地球—海洋地质] TV148.3[天文地球—海洋科学]