摘要
作者首先对挖槽减淤效果进行了定义 ,并根据分析 ,挖槽效果的影响因素主要包括挖槽尺度和水沙条件等两个方面 ,从概化模型的试验结果可以看出 ,当挖槽断面的河相关系B/H处于 5～ 8之间、挖槽长度约为10km时 ,黄河下游弯曲河段的疏浚挖槽减淤效果相对较好 ;对于一定的挖槽尺寸而言 ,挖槽减淤效果随来沙系数的增加而迅速减小 ,当来沙系数小于 0 0 2 5时 ,挖槽效果比较明显 ,当来沙系数大于 0 0 5时 ,挖槽效果基本消失。此外 ,在概化试验的基础上 ,提出了挖槽溯源冲刷长度等参数的经验公式 ,并结合理论分析 。
The dredging efficiency is studied in model test of a generalized river section in the Lower Yellow River. It is found that the main factors affecting the dredging efficiency are: dredged dimensions and flow sediment conditions. In case the river facies relation is ranging from 5 to 8 and the length of the channel is about 10km, the dredging efficiency will be maximum. On the other hand the dredging effect is remarkably dependent on the ratio of sediment concentration to river discharge. The efficiency reaches the highest when the ratio is 0 025 and decreases to about zero when the ratio is over 0 05. Finally, a method for estimating the dredging efficiency is proposed.
出处
《水利学报》
EI
CSCD
北大核心
2002年第11期78-83,共6页
Journal of Hydraulic Engineering
基金
国家重点基础研究专项经费资助 (G19990 43 60 4)
国家自然科学基金和水利部联合资助项目 (5 9890 2 0 0 )
关键词
黄河下游
影响因素
疏浚
减淤效果
冲淤率
the Lower Yellow River
dredging
dredging efficiency
ratio of scour to silting
fluvial facies
