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Related Experiment Video

Updated: May 16, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

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Published on: February 22, 2018

Verification of equations for incipient motion studies for a rigid rectangular channel.

Charles Hin Joo Bong¹, Tze Liang Lau, Aminuddin Ab Ghani

¹River Engineering and Urban Drainage Research Centre (REDAC), Universiti Sains Malaysia, Engineering Campus, Seri Ampangan, 14300 Nibong Tebal, Penang, Malaysia. bhjcharles@feng.unimas.my

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|November 22, 2012

Summary

This study tested equations for incipient motion in rectangular channels. A new equation incorporating sediment deposit thickness improved prediction accuracy for sediment transport.

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Area of Science:

* Fluid Mechanics
* Sediment Transport
* Open Channel Flow

Background:

* Existing equations for incipient motion in rigid rectangular channels require verification.
* Sediment deposit thickness is a critical factor influencing incipient motion dynamics.
* Previous models may not fully account for the impact of sediment layer depth.

Purpose of the Study:

* To validate established incipient motion equations (Novak & Nalluri, El-Zaemey) against experimental data.
* To investigate the influence of sediment deposit thickness on critical velocity predictions.
* To develop an improved equation for incipient motion that incorporates sediment depth.

Main Methods:

* Experimental data collection from a rectangular flume (0.3m and 0.6m widths).
* Comparison of experimental critical velocity with predictions from Novak & Nalluri and El-Zaemey equations.
* Analysis using the Shields Diagram to visualize the effect of sediment deposit thickness.
* Development and validation of a new predictive equation.

Main Results:

* El-Zaemey's equation showed better initial agreement (average discrepancy ratio 1.06) than Novak & Nalluri (0.87).
* Accuracy of El-Zaemey's equation decreased with increasing sediment deposit thickness.
* Shields Diagram analysis confirmed that thicker deposits increase dimensionless shear stress (θ).
* The newly proposed equation, including sediment thickness, yielded improved predictions (average discrepancy ratio 1.02).

Conclusions:

* Existing equations have limitations, particularly with thicker sediment deposits.
* Sediment deposit thickness significantly impacts incipient motion and requires explicit consideration.
* The new equation offers a more accurate approach for predicting incipient motion in rectangular channels with varying sediment depths.