A new portable in situ flume for measuring critical shear stress on river beds
A new portable in situ flume for measuring critical shear stress on river beds作者机构：National Water Research Institute Environment and Climate Change Canada Department of Environmental Engineering University of Guelph
出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))
年 卷 期：2021年第36卷第2期
页 面：235-242页
核心收录：
学科分类：0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 081502[工学-水力学及河流动力学] 0903[农学-农业资源与环境] 0816[工学-测绘科学与技术]
基 金：financially supported by the Great Lakes Action Plan (GLAP) with funding by Environment and Climate Change Canada the support from the Engineering Branch at the National Water Research Institute for providing very valuable advice and helping to build the device
主 题：Sediment erosion In situ flume Critical bed shear stress Particle image velocimetry Law of the wall
摘 要：A new portable in situ flume(PISF) for measuring critical bed shear stress(CBSS) was developed in this study. The PISF consists of an open bottom sediment erosion chamber and an electrically-driven pump.Unlike most existing in situ flumes with similar designs, the new PISF does not rely on monitoring the flow conditions or particle density in the sediment erosion chamber; instead, it is a pre-calibrated flume.The calibration was performed by first determining CBSS of various selected sediment samples of known particle size and density(using the law of the wall), based on flow velocity-depth profiles measured in a6 m straight open-channel flume using a Particle Image Velocimetry(PIV) system. These same particles of known CBSS were then used in the new in-situ flume under controlled lab conditions to obtain a series of calibration curves of CBSS vs. pump electrical power. A wide variety of particle types and sizes(simulated sediments) were used in this two-step calibration procedure to widen CBSS measurement range and simulate cohesive force effects. The size of the PISF is much smaller and more practical than other similar devices as lamellar flow conditions are not required and it can be applied to a wide range of sediment types including cohesive sediments.
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