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Structural characteristics of river networks and their relations to basin factors in the Yangtze and Yellow River basins

查看全文 作　　者：CHEN [1]XiaBin;WANG [1,2]YiChu;NI [1]JinRen 高影响力作者 机构地区：[1]The Key Laboratory of Water and Sediment Sciences,Ministry of Education,College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China;[2]Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT),Peking University,Beijing 100871,China高影响力机构 出　　处：《Science China(Technological Sciences)》索引2019年第62卷第11期,共11页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(Grant No.51721006) 摘　　要：The integration of rivers and basins highly implies the possible existence of certain relationships between hierarchical characteristics of river networks and primary basin factors.Here we investigated river networks in two large basins,the Yangtze River and the Yellow River,characterized with basic factors such as annual precipitation,slope,soil erodibility and vegetation.Hierarchical analysis demonstrated a fair self-similarity of river networks at the stream-order 1-5 in both rivers,described by the structural parameters including bifurcation ratio,side-branching ratio,drainage density,and length of headwater-river.Besides precipitation,basin slope was essential in shaping river networks in both basins,showing a significant positive correlation(R^2=0.39-0.85)to bifurcation ratio,side-branching ratio,and drainage density.Given the same basin slope(5°-15°),the higher soil erodibility and sparse vegetation would promote greater side-branching ratio and drainage density in the Yellow River,which were estimated 11.97%and 63.70%larger,respectively than those in the Yangtze River.This study highlights the importance to formulate basin-specific strategies for water and soil conservation in terms of different structures of river networks. 关 键 词：RIVER network structural characteristics BASIN factor YANGTZE RIVER YELLOW RIVER
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