The effectiveness of bandal-like structures (BLS) for the formation or restoration of navigational channel is tested. The basic feature of BLS in terms of flow and sediment control are clarified using simplified mobile bed experiments where a series of such structures are installed on both side banks . Based on the experimental results and flow visualization, simplified analytical model for the prediction of main channel degradation (as a measure of navigational channel formation or restoration) is developed and verified using experimental data. The model predicts the experimental results reasonably well .
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