Benefits of design modifications to the Birkbeck bedload sampler illustrated by flash‐floods in an ephemeral gravel‐bed channel
Benefits of design modifications to the Birkbeck bedload sampler illustrated by flash‐floods in an ephemeral gravel‐bed channel
复制标题
通过短暂砾石河道中的山洪说明了伯克贝克底土采样器设计修改的好处
DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
I. Reid
中科院分区：
文献类型：
--
作者：
Nathaniel Bergman;J. Laronne;I. Reid
展示了自20世纪90年代初以来一直在以色列纳哈勒埃什特莫阿持续运行的伯克贝克推移质槽采样系统设计的三个简单修改的好处。这些改进包括安装一个可移动的槽盖，以延迟沉积物的积聚，从而可以在洪水后期进行采样，并与其他采样器一起延长洪水波期间的采样时间;包括一个尺寸可调的槽，以便在安装后增加在运输过程中作为推移质的最大碎屑尺寸的采样概率，一旦获得有关推移质粒度分布的知识;以及采样器侧壁门，允许识别累积推移质内的分层和结构变化，从而促进存款的智能采样以确定粒度。本文介绍并讨论了七次山洪暴发的结果，并提出了推移质监测的建议，特别是在沉积物通量高且动态沉积物记录由于仪器限制而不可避免地较短的河流中。版权所有© 2006约翰威利父子有限公司。
The benefits of three simple modifications to the design of a Birkbeck bedload slot‐sampling system that has been continuously operating in Nahal Eshtemoa, Israel, since the early 1990s are demonstrated. The modifications include the deployment of a removable slot cover which delays the accumulation of sediment, so allowing sampling at late stages of a flood and, in conjunction with other samplers, extending the period of sampling during a flood wave; inclusion of a slot the size of which is adjustable so that that the probability of sampling the largest clast sizes in transit as bedload can be increased post‐installation, once knowledge is gained about the bedload grain‐size distribution; and a sampler side‐wall door that allows stratification and textural changes within the accumulated bedload to be identified, so promoting intelligent sampling of the deposit for grain‐size determination. Results from seven flash‐floods are presented and discussed, with recommendations for bedload monitoring, particularly in rivers where sediment flux is high and dynamic sediment records are inevitably short because of instrumental limitations. Copyright © 2006 John Wiley & Sons, Ltd.