Using Natural Radionuclides to Trace Sources of Suspended Particles in the Lower Reaches of the Yellow River  

作　　者：ZHANG Han BURNETT CWilliam ZHANG Xiaojie ZHAO Shibin YANG Disong NAN Haiming YU Zhigang XU Bochao 

机构地区：[1]Frontiers Science Center for Deep Ocean Multispheres and Earth System,and Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China [2]Laboratory for Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China [3]College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China [4]Department of Earth,Ocean and Atmospheric Science,Florida State University,Tallahassee,FL 32306,USA [5]North China Sea Environmental Monitoring Center,State Oceanic Administration,Key Laboratory of Ecological Prewarning and Protection of Bohai Sea,MNR,Qingdao 266033,China [6]Shandong Provincial Key Laboratory of Marine Ecological Environment and Disaster Prevention and Mitigation,Qingdao 266033,China

出　　处：《Journal of Ocean University of China》2024年第1期99-108,共10页中国海洋大学学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.U22A20580,42130410,and U1906210);the Fundamental Research Funds for the Central Universities(No.201962003).

摘　　要：Natural radionuclides are powerful tools for understanding the sources and fate of suspended particulate matter(SPM).Particulate matter with different particle sizes behaves differently with respect to adsorption and desorption.We analyzed the activi-ties and distribution characteristics of multiple natural radionuclides(238U,226Ra,40K,228Ra,7Be and 210Pbex)on size-fractionated SPM at the Lijin Hydrographic Station(Huanghe or Yellow River)every month over a one-year period.Results showed that medium silt(16–32µm)was the main component.As expected,the activity of each radionuclide decreased with an increase of particle size.We examined the sources of SPM with different particle sizes using activity ratios of 226Ra/238U,228Ra/226Ra,40K/238U and 7Be/210Pbex,and concluded that SPM with different particle sizes originated from different sources.Our results indicate that fine SPM(<32µm)was mainly from the erosion of soil along the lower reaches of the Yellow River,while coarse SPM(>32µm)was mainly derived from resuspension of riverbed sediment.During high runoff periods,the concentration of SPM increased significantly,and the pro-portion of fine particles originating upstream increased.Naturally occurring radioactive isotopes,especially on size-fractionated par-ticles,are therefore seen as useful tracers to understand the sources and behaviors of riverine particles transported from land to sea.

关 键 词：the Yellow River suspended particulate matter size-fractions radionuclides sediment sources water elutriator 

分 类 号：TV143[水利工程—水力学及河流动力学]