染色法测量坡面流流速的最佳测流区长度研究

被引:22
作者
罗榕婷 [1 ]
张光辉 [1 ,2 ]
沈瑞昌 [1 ]
曹颖 [1 ]
机构
[1] 北京师范大学地理学与遥感科学学院
[2] 北京师范大学地表过程与资源生态国家重点实验室
关键词
染色法; 流速; 测定距离; 坡面流; 流量法;
D O I
暂无
中图分类号
S157.1 [水土流失的原因及其防治];
学科分类号
摘要
染色法是测定坡面流流速最常用的方法,但对测流区长度的选择没有统一标准。统一测流区长度不仅能减少流速测定误差,还能提高不同试验间的可比性。本文采用室内变坡水槽试验,用染色法测量表面最大流速并计算平均流速时,选择6个常见测流区长度,以流量法计算的平均流速为参照值,选取5个统计参数(RRMSE、RE、NSE、R2、MAE)作为评价指标,将不同测流区长度下染色法与流量法所获得的平均流速进行比较,分析染色法测量坡面流流速的最佳距离。研究结果表明:当测流区长度为2m和3m时,RRMSE都较小;在2m处,RE、MAE达到最小,NSE、R2最接近1,此时染色法测定的流速与流量法计算的流速最为接近。因此,用染色剂法测量坡面流速度的最佳距离应选在2m。
引用
收藏
页码:5 / 9
页数:5
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