黄河下游萎缩性河道挖河减淤的临界比降研究  

Critical slope of shriveling channel adopting dredge to reduce the deposition in Lower Yellow River

作　　者：姚文艺[1] 侯志军[1] 

机构地区：[1]黄河水利科学研究院,河南郑州450003

出　　处：《水利学报》2001年第4期75-78,共4页Journal of Hydraulic Engineering

基　　金：国家重点基础研究专项经费资助 !(G19990 436 0 4) ;"95"国家重点科技攻关计划专项经费资助 !(98 92 8 0 2 0 2 )

摘　　要：理论分析及试验研究表明 ,要提高黄河下游萎缩性河道挖河减淤效果 ,就要增大挖河段以上河段的溯源冲刷量 ,同时减少挖河段的泥沙回淤量 .而且 ,后者是提高挖河减淤效率的重要因素 .为此 ,挖河段的底坡比降应在设计水沙条件下使水流挟沙力沿程不变或有所增大 ,其临界坡降至少应等于或大于水流能够克服边界摩擦所引起的摩阻坡降和为保持水流运动所需要的水力坡降之和 .根据试验资料初步分析 ,黄河下游窄河段挖河减淤的临界比降应大于 1 .Theoretical analysis and experimental data show that to increase the retrogressive erosion of the upstream river section and decrease the back deposition of the dredged channel are important to elevate the effect of deposition reduction in dredging.On this basis,the designed slope of the dredged channel must be large enough to overcome the friction and keeping the sediment transport capacity not to change.According to the data analysis,the critical slope is about 1.

关 键 词：萎缩性河道 挖河减淤 黄河 临界比降 

分 类 号：TV143[水利工程—水力学及河流动力学]