BED-LOAD MEASUREMENT DURING SMALL SIZED FLOOD IN GRAVEL-BED RIVER

Abstract

A method to detect an amount and size of bed-load in a gravel-bed river was proposed. This method was designed for measuring the sediment transport during relatively small flood. A detecting device was composed by a steel shell, sound recorder and base weight. The diameter of this device was comparable to the representative size of the bed materials in riffles. A procedure to estimate the size and impinging velocity of sediment particles was developed. The devices were used in a gravel-bed river during the flushing flow and validity of the proposed concept was proved. Controversial points were discussed and improvement plans were discussed.