APPLICATION OF THE POROSITY-BED VARIATION MODEL CONSIDERING SHELTERING EFFECT OF IMMOVABLE SEDIMENT TO THE FIELD EXPERIMENT OF SEDIMENT SUPPLY

Abstract

 Supplying finer sediment to the gravel-bed river can cause the selective sediment transport, and the bed variation is accompanied with the porosity variation and affected by sheltering effect of the immovable sediment. When selective sediment supply such as the sediment replenishment from the reservoir is planned, the simulation model that express such phenomena is necessary to evaluate the riverbed variation with the impact on environment of downstream river. In this study, the porosity-bed variation model is expanded to express the riverbed variation with the variation of exchange layer. Furthermore, the model is applied to the field experiment of sediment supply carried out in the Yahagi River, and is confirmed the availability.