黄河内蒙古段不同流量过程输沙效率分析  

Analysis on Sediment Transport Efficiency of Various Discharge Courses in Inner Mongolia Reach of the Yellow River

作　　者：李学春[1] 杨峰[1] 李瑞[2] 

机构地区：[1]黄河水利委员会宁蒙水文水资源局,内蒙古包头014030 [2]黄河水利委员会中游水文水资源局,山西榆次030600

出　　处：《人民黄河》2015年第11期8-10,共3页Yellow River

基　　金：黄委水文局科技项目(文H0809)

摘　　要：选定黄河内蒙古段1958—2013年体现年际间的丰枯变化和年内的季节性变化特征的94场次流量过程,以排沙比和淤积比为主要指标,分析了不同时期各级流量过程的输沙效率。结果表明:对于平均流量小于1 000 m3/s的流量过程,流量与含沙量的变化均对输沙效率具有比较显著的影响,即排沙比随着流量的增加而增大,随着含沙量的增大而减小。不同流量过程中泥沙组成的变化将导致各级粒径泥沙的输移分配比例有所不同,细沙流量过程水流的输沙能力主要表现在对粗沙的输移上,而粗沙流量过程水流的输沙能力主要表现在对细沙的输移上。94 flow courses from 1958 to 2013, reflecting inter-annual and annual seasonal variation in Inner Mongolia section of the Yellow River were selected by this paper to analyze sediment transport efficiency of various flow courses in different periods with sediment delivery and deposition rate as the main index. The results show that the changes of flow and sediment concentration have significant effects on sediment transport efficiency when average flow rate is less than 1,000 m3/s and sediment delivery rate is proportional to flow and inversely proportional to sediment concentration. The changing of sediment composition in various discharge courses will lead to different sediment transport allocation proportions.

关 键 词：输沙效率 流量级 内蒙古段 黄河 

分 类 号：P333[天文地球—水文科学] TV882.1[水利工程—水文学及水资源]