调水调沙期间黄河口羽状流的逐时变化  

Hourly change in sediment plume at the Yellow River mouth during the water-sediment regulation

作　　者：于永贵 石学法[2,3] 迟万清[4] 胡子峰 乔淑卿 YU Yonggui;SHI Xuefa;CHI Wanqing;HU Zifeng;QIAO Shuqing(College of Marine Geoseiences,Ocean University of China,Qingdao 266003,China;Laboratory of Marine Geology and Geophysics,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China;Marine Engineering Environment ＆ Geomatic Center,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;College of Oceanography,Hohai University,Nanjing 210098,China)

机构地区：[1]中国海洋大学海洋地球科学学院,青岛266003 [2]国家海洋局第一海洋研究所海洋沉积与环境地质国家海洋局重点实验室,青岛266061 [3]青岛海洋科学与技术国家实验室海洋地质过程与环境功能实验室,青岛266237 [4]国家海洋局第一海洋研究所海洋工程环境与测绘研究中心,青岛266061 [5]河海大学海洋学院,南京210098

出　　处：《海洋地质与第四纪地质》2018年第5期41-51,共11页Marine Geology & Quaternary Geology

基　　金：国家海洋局第一海洋研究所基本科研业务费专项资金项目"黄河调水调沙的沉积记录"(GY0215SG07)

摘　　要：2002年黄河实施调水调沙以来,黄河入海泥沙普遍以异轻羽状流的形式在河口附近的有限区域内堆积下来。采用2011年、2012年以及2013年调水调沙期间3期静止轨道海洋水色卫星(GOCI)数据对黄河口附近海域进行悬浮物浓度反演,提取了黄河口羽状流的逐时变化信息;通过黄河口水动力数值模拟以及风场、潮汐等实测数据分析,阐明了羽状流逐时变化的驱动机制。研究结果表明:黄河调水调沙前后黄河口羽状流表现出单向变化和往复变化两种不同的变化过程;而悬浮物浓度的逐时变化显示:河口附近不同站位的悬浮物浓度逐时变化过程差异较大,同一站位的悬浮物浓度可在1小时之内升高或降低约100mg/L。单向变化型羽状流主要受单向潮流的控制,且GOCI观测时段位于一个落潮或者涨潮过程,河流动力较弱;往复变化型羽状流受涨、落潮往复潮流的控制,涨、落潮流向的转换驱使羽状流向相反的方向运动,而且羽状流位于潮流切变带以内,切变锋对羽状流的形态、分布范围具有明显的切变效应。Since the water sediment regulation（WSR）was put into operation in2002,most of the Yellow River sediment has been deposited in a confined near-shore zone as a result of hypopycnal plume.On the basis of GOCI satellite images collected in 2011,2012 and2013,we analyzed the hourly changes in sediment plume at the Yellow River mouth through the inversion to suspended matter concentrations.Wind fields along with tide data during the satellite-observation period were comprehensively analyzed,and the hydrodynamic regime in the mouth area was numerically modeled to uncover the influence forces of these changes.The results show that the hourly changes in sediment plume can be classified into two types：1）one-orientation changes—the sediment plume moves gradually towards a definite direction（landwards or seawards）;2）back-and-force movement—the sediment plume shifts landwards or seawards in the first few hours and then moved backwards.In addition,the total suspended mater（TSM）at the Yellow River mouth varies both spatially and temporally,reflecting an intensive interaction between different hydrodynamic processes.For some sites,the hourly changes in TSM may exceed100 mg/L.Oneorientation changes are primarily controlled by tidal currents with a minor influence from river input,whereas back-andforce movements are controlled by the changes of ebb and flood tide.Shear front generated near the river mouth is also believed an important process behind the back-and-force movement of sediment plume.

关 键 词：调水调沙 羽状流 逐时变化 驱动因素 

分 类 号：X145[环境科学与工程—环境科学]