Effect of Sediment Transport Process on Removal of Riparian Vegetation


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Abstract


This study aims to find out the effects of sediment transport processes on removal of riparian vegetation on a braided gravel-bed river, called the Tenryu in Central Japan. Previous research shows that hydrodynamic parameter, for instance, bed shear stress and drag moment can simulate the vegetation removal condition during flood flow. However, these are not enough to estimate the vegetation removal. To minimize the error during 2-D numerical analysis, sediment transport numerical simulation has been introduced to minimize the error. Initially, sediment transport numerical simulation has been validated with actual bed level change which shows good agreement with simulation. Afterwards, spatial distribution of local scouring and deposition has been described for the year of 1982 and 2003 by using maximum flood hydrograph, respectively. Local souring depth greater than 0.5 m is considered the threshold depth to remove vegetation. About 9% of the vegetation can be removed by applying local scouring as a morphological parameter. In total, 86% of vegetation can be removed by hydrodynamic and morphological parameter
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Keywords


Flood Flow; Sediment Transport; Vegetation; Scouring; Deposition; Bed Level Change

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References


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