A race-track recirculating flume for cohesive sediment research
作者:
Ismael Piedra-Cueva,
Mathieu Mory,
Andre Temperville,
期刊:
Journal of Hydraulic Research
(Taylor Available online 1997)
卷期:
Volume 35,
issue 3
页码: 377-396
ISSN:0022-1686
年代: 1997
DOI:10.1080/00221689709498419
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We investigate a procedure for carrying out experiments on the erosion of a deposited mud bed by a steady flow in a race-track recirculating flume. This is a large-scale flume 0.5 m wide consisting of two straight sections 16 m long connected by two circular bends. The currents are produced by a vertical disc pump. It is shown that experimental conditions producing uniform erosion over the whole surface of the mud bed are met when the bed is restricted in a limited straight part of the flume. Measurements of the flow kinematics by a Laser Doppler Anemometer performed in clear water confirm that the flow applies a quasi-uniform bottom shear stress over the bed. Stratification effects are suppressed in this facility due to the strong mixing of suspended sediment concentration by the disc pump. A theoretical analysis of stratification effects however indicates that they remain small as long as the depth-averaged concentration is below 13.5gl-1. A procedure to determine quasi-instantaneous erosion rates from depth-averaged suspended sediment concentration is finally presented.
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