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
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
收藏
页码:141 / 146
页数:6
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