%0 Journal Article
%T The Variation Trend of Streamflow and Sediment Flux in the Middle Reaches of Yellow River over the Past 60 Years and the Influencing Factors<br>近60 年黄河中游水沙变化趋势及其影响因素分析
%A ZHAO Guangju
%A MU Xingmin
%A TIAN Peng
%A WANG Fei
%A GAO Peng
%A <br>赵广举
%A 穆兴民
%A 田鹏
%A 王飞
%A 高鹏
%J 资源科学
%D 2012
%I 
%X The hydrological processes and sediment fluxes have been dramatically altered by large amount of dams’construction as well as reforestation in the Yellow River basin during the past several decades.Better understanding of the variations of streamflow and sediment flux in the Yellow River is greatly helpful for soil and water conservation,water resources planning and river basin management.This study has systematically analyzed the variations of streamflow and sediment flux in the Middle Reaches of Yellow River from 1950s to 2009 based on the observed data from 6 hydrological stations(Toudaoguai,Longmen,Huayuankou,Huaxian,Hejin and Baijiachuan)with linear regression,Mann-Kendall test,double mass curve method and wavelet transform.The results indicate that both runoff and sediment flux show significant decreasing trends,which are more evident after 1970s.Average annual streamflow and sediment flux during 2000 and 2009 are extremely low at Hejin station in Fen River,accounting for only 20%of those from 1950 to 1959.Being detected by double mass curve function,the abrupt changes of streamflow and sediment flux at Toudaoguai,Longmen and Huayuankou appeared in 1985 due to the operation of Longyangxia Dam.The significant wavelet spectrum of streamflow and sediment flux was mainly detected during 1950s and 1970s with a period of 0.5-1 year at confidence level of 95%,but later the periodicity features become more and more insignificant and even disappear.In summary,the reduction of streamflow and sediment flux is mainly caused by climate change,rainfall,soil and water conservation measures(such as afforestation,terraces,reservoirs and dams)and other human activities.Among these,reservoirs operation in the mainstream has great impacts on variations of water and sediment at the Toudaoguai and Huayuankou hydrological stations.
%K Middle Reaches of Yellow River
%K Streamflow
%K Sediment flux
%K Influencing factors<br>黄河中游
%K 流量
%K 输沙量
%K 影响因素
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=B5EDD921F3D863E289B22F36E70174A7007B5F5E43D63598017D41BB67247657&cid=B47B31F6349F979B&jid=9DEEAF23637E6E9539AD99BE6ABAB2B3&aid=371E65CB2CE8FF91310872AC7FC1ADEE&yid=99E9153A83D4CB11&vid=339D79302DF62549&iid=B31275AF3241DB2D&sid=A50445FB05D4B1A0&eid=818971F8BC8F9389&journal_id=1007-7588&journal_name=资源科学&referenced_num=0&reference_num=17