Comparison of Bed Load Sampler and Tracer Data on Initiation of Motion
Comparison of Bed Load Sampler and Tracer Data on Initiation of Motion
复制标题
床载采样器和示踪剂数据在运动启动时的比较
DOI：
10.1061/(asce)0733-9429(1999)125:6(661
复制
发表时间：
1999
影响因子：
2.4
通讯作者：
J. Bathurst
中科院分区：
文献类型：
--
作者：
M. Ashiq;J. Bathurst
在科罗拉多州咆哮河的两个地点，对Helley-Smith床载采样器和涂漆示踪技术进行了调查，以测量粗床物质河流中每种粒径的不同临界流量，以引发运动。对于采样器技术，捕获的最大颗粒的大小与采样时的放电配对。对于示踪技术，示踪剂移动的最大尺寸与放置和观察之间的最大放电配对。性能方面的考虑表明，对于给定的粒径，采样器技术可能比示踪剂技术产生更大的临界放电。当示踪剂测量指的是绝对最大移动尺寸时，有限的现场数据支持这一点。当示踪剂测量值指的是移动的最大尺寸（所有较小的尺寸都被移动了）时，数据与采样器数据重叠。因此，在使用任何一种技术的数据来开发或测试粒子运动起始的公式时，都应谨慎，因为这些公式可能显示出很小程度的技术依赖性。
Concerns that the Helley-Smith bed load sampler and painted tracer techniques measure different critical discharges for the initiation of motion for each particle size in coarse bed material rivers are investigated for two sites on the Roaring River in Colorado. For the sampler technique, the size of the largest particle trapped is paired with the discharge at the time of sampling. For the tracer technique, the maximum size of tracer moved is paired with the maximum discharge between emplacement and observation. Performance considerations suggest that the sampler technique may yield a larger critical discharge for a given particle size than will the tracer technique. The limited field data support this when the tracer measurements refer to the absolute maximum size moved. When the tracer measurements refer to the largest size moved for which all smaller sizes were moved, the data overlap the sampler data. Caution should therefore be displayed when using data from either technique to develop or test formulas for initiation of particle motion, as such formulas may show a small level of technique dependence.