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《Journal of Soil and Water Conservation》 2017-04
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Scale Effect of Hyper-concentrated Flows in Jinghe River Basin,Yellow River

YAN Ming;HE Li;ZHENG Mingguo;SUN Liying;PEI Liang;WANG Suiji;Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences;  
Based on the data measured in the Jinghe River Basin(JRB)between 1965 and 2014(including daily precipitation,runoff and concentration),the spatio-temporall characteristics of hyper-concentrated flow were analyzed.Flows with daily concentration greater than 100kg/m3 were identified as hyper-concentrated flows.Analysis showed that,the occurrences of hyper-concentrated flows in the JRB can be grouped into three periods,which were 1965—1978,1979—1990and 2006—2014.Hyper-concentrated flows occurred frequently before 1978,and the occurrence decreased dramatically after 2006.Moreover,the JRB is divided into two parts,the north and the south part,where the temporal distributions of hyper-concentrated flows had different characteristics.For the north part,the sediment yield modus decreased with the increasing drainage area,while the runoff modus increased with increasing drainage area.For the south part,the modus of the runoff and sediment yield both might increase with the increasing drainage area.The temporal characteristics of hyper-concentrated flow were the same in the south and north part,JRB.So,the complex effect sizes during the first period changed to linear relation gradually.Analysis indicates that hyper-concentrated flows are effectively controlled by water and soil conservation practices in the JRB.
【Fund】: 国家自然科学基金项目(41371037 41671278);; 国家重点研发计划项目(2016YFC0402503)
【CateGory Index】: S157.1
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