Author(s): Wei Miao; Liekai Cao; Qiang Zhong; Danxun Li

Linked Author(s):

Keywords: Bed-load transport rate; flight length; flight time; imaging technique; number of moving particles; time interval; velocity

Abstract: The influence of the time interval (Δt) between two successive images on measurement of bed-load dynamics has been investigated both analytically and experimentally. The analytical approach is based on simplifying bed-load motion to follow a “flight-rest” pattern. The experimental work involves measuring bed-load transport in a closed channel with a particle imaging technique. The two approaches are consistent in revealing the influence of Δt on measurement results. It is shown that an increase in Δt leads to reduction in measured particle velocity and increase in the measured number of moving particles as well as the flight time. The measured flight length and bed-load transport rate are not directly affected by Δt. The influence of Δt needs to be fully addressed in image-based measurement of bed-load transport.

DOI: https://doi.org/10.1080/00221686.2017.1399938

Year: 2018