不同示踪法测量砾石层中水流流速研究

被引：4

作者：

陈丽燕

雷廷武

董月群

颜燕

机构：

[1] 中国农业大学水利与土木工程学院

来源：

农业机械学报 | 2015年 / 46卷 / 04期

关键词：

砾石层; 平均流速; 优势流速; 最大流速; 电解质示踪法;

D O I：

暂无

中图分类号：

S157 [水土保持];

学科分类号：

0815 ; 082802 ; 090707 ; 0910 ;

摘要：

采用室内试验,用平均粒径约2cm的砾石,在长4m、宽15cm、高50cm的水槽内堆积厚为5cm的砾石层,在坡度为4°、8°、12°和流量为3、6、12L/min条件下,距离电解质脉冲发生器0.3、0.6、0.9、1.2、1.5m处放置探针,测量电导率变化过程,计算水流的最大流速、优势流速和平均流速,并用染色剂示踪法对比砾石层中水流的最大测量流速。结果表明,试验所用各工况,流量对流速的影响不显著,坡度增大,流速明显增大。试验条件下,水流的优势流速变化范围为0.031～0.070m/s,优势流速与最大流速的比值稳定,在0.81～0.83之间。平均流速与优势流速的比值随坡长的增加逐渐增大,增长的速率逐渐减小并趋于稳定。平均流速与最大流速的比值在0.68～0.78之间,并随距离的增加稍有增大。

引用

页码：141 / 146

页数：6

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