DISCUSSIONS OF BAR GROWTH RATE AND DEVELOPMENT OF BAR HEIGHT ESTIAMATION METHOD

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  • 交互砂州の成長率に関する考察と波高推定手法の構築

Abstract

<p> Predicting changes in bar wave height is important from the perspective of channel management. In this study, we perform theoretical and numerical analyses to discuss the bar growth rate relative to the flow discharge and current bar wave height. In addition, we propose a simple model to predict wave height development for a channel with flood plain limited by levees. We develop the model based on the numerical results, referencing the bar growth rate equation used in the theoretical analysis. Then, we input a hydro with flood control by the dam and a hydro without flood control into the model. As a result, the former case showed a continuous increase in wave height, whereas the latter case showed a decay of wave height at near the peak flow discharge, so that the final wave height did not increase significantly. This suggests that dam flood control may have a significant effect on the increase in bar wave height.</p>

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