变坡陡比降河道泥沙淤积逆向发展速度的试验研究  

Experimental study on speed of sediment deposition reversible transmission in steep slope river

作　　者：李彬[1] 李果[1] 郭志学[1] 陈日东[1] 张斌[1] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,成都610065

出　　处：《南水北调与水利科技》2016年第2期148-151,182,共5页South-to-North Water Transfers and Water Science & Technology

基　　金：国家科技支撑计划(2012BAB05B02);国家自然科学基金项目(50949057)~~

摘　　要：针对山区性河流上陡下缓的比降特点,通过变坡陡比降水槽采用单因素控制法,研究了强输沙状态下加沙强度、流量及泥沙粒径对泥沙淤积逆向发展速度的影响。试验结果表明:上游陡坡河道的强输沙水流,进入下游略缓的陡坡时,在床面可发生淤积,该淤积影响向上游传播的速度与加沙强度、流量及泥沙粒径有关。上游加沙强度越大、来流流量越小或加沙粒径越大,泥沙淤积逆行发展速度越快。泥沙逆向淤积发展的速度还与河床比降有关,总体上,比降越小,逆向淤积发展速度越快。In view of mountainous river characteristics,the effects of sediment concentration,flow and diameter on sediment deposition transmission were studied by variable and steep slope flume with single-factor controlling theory.The results showed that due to the slope becoming gentle,sediment would be deposited in the middle or lower reach firstly,The higher the sediment concentration,the lower flow or the larger diameter was,and the faster speed of sediment deposition transmission would be.At the same time,the speed was also related to slope of flume.The steeper the slope,the faster the speed would also be.

关 键 词：陡比降 强输沙 变坡 淤积 逆向传播 速度 流量 粒径 

分 类 号：TV142.2[水利工程—水力学及河流动力学]