Scour prediction using the Movability Number criteria for incipient motion

Incipient Motion Criterion for Plane Bed Channels

International Journal of Fluid Mechanics Research ◽

10.1615/interjfluidmechres.v36.i1.50 ◽

2009 ◽

Vol 36 (1) ◽

pp. 80-95

Author(s):

Achanta Ramakrishna Rao ◽

Bimlesh Kumar

Keyword(s):

Incipient Motion

Download Full-text

Incipient motion of solid particles in a two-dimensional flow field

10.31274/rtd-180813-17389 ◽

1960 ◽

Author(s):

Connayil Mani Jacob

Keyword(s):

Flow Field ◽

Solid Particles ◽

Two Dimensional ◽

Incipient Motion ◽

Dimensional Flow ◽

Two Dimensional Flow

Download Full-text

Effect of Mean Velocity-to-Critical Velocity Ratios on Bed Topography and Incipient Motion in a Meandering Channel: Experimental Investigation

Water ◽

10.3390/w13070883 ◽

2021 ◽

Vol 13 (7) ◽

pp. 883

Author(s):

Nargess Moghaddassi ◽

Seyed Habib Musavi-Jahromi ◽

Mohammad Vaghefi ◽

Amir Khosrojerdi

Keyword(s):

Experimental Investigation ◽

Critical Velocity ◽

Velocity Ratio ◽

Scour Depth ◽

Incipient Motion ◽

Mean Velocity ◽

Straight Path ◽

Meandering Channel ◽

Bed Topography ◽

The Mean

As 180-degree meanders are observed in abundance in nature, a meandering channel with two consecutive 180-degree bends was designed and constructed to investigate bed topography variations. These two 180-degree mild bends are located between two upstream and downstream straight paths. In this study, different mean velocity-to-critical velocity ratios have been tested at the upstream straight path to determine the meander’s incipient motion. To this end, bed topography variations along the meander and the downstream straight path were addressed for different mean velocity-to-critical velocity ratios. In addition, the upstream bend’s effect on the downstream bend was investigated. Results indicated that the maximum scour depth at the downstream bend increased as a result of changing the mean velocity-to-critical velocity ratio from 0.8 to 0.84, 0.86, 0.89, 0.92, 0.95, and 0.98 by, respectively, 1.5, 2.5, 5, 10, 12, and 26 times. Moreover, increasing the ratio increased the maximum sedimentary height by 3, 10, 23, 48, 49, and 56 times. The upstream bend’s incipient motion was observed for the mean velocity-to-critical velocity ratio of 0.89, while the downstream bend’s incipient motion occurred for the ratio of 0.78.

Download Full-text