Dislodgement Process of Sediment Partides on Bed at Unsteady Flow

Sediment Transport in Unsteady Flow Conditions

Sediment transport under unsteady flow condition is studied experimentally. In the first step, sediment transport under different steady flow conditions was measured and an empirical equation was derived for its calculation. In the next step, two continuous and three stepwise hydrographs were generated in the flume, and their sediment transport rate was measured. The continuous hydrographs were...

A simple model of unsteady sheet-flow sediment transport

A simple, quasi-steady, one-dimensional, vertical (1DV) model of unsteady sheet flow is presented. The central aim is to provide greater realism in the near-bed, high-concentration layer, than is possible using models based on the classical referenceconcentration approach. This is achieved by tracking erosion and deposition at the bottom of the mobile sediment layer in relation to the amount of...

Effect of unsteady glottal flow on the speech production process

The purpose of the present study is to clarify the effects of unsteady glottal flow on the phonation. We numerically simulate the speech production process within the larynx and the vocal tract based on our proposed glottal sound source model. The simulation shows amplitude and waveform fluctuations in pressure within the larynx caused by unsteady fluid motion. In order to investigate the unste...

Investigation of unsteady and non-uniform flow and sediment transport characteristics at culvert sites

Critical conditions of bed sediment entrainment due to debris flow

The present study describes entrainment characteristics of bed material into debris flow, based on flume tests, numerical and dimensional analyses. Flume tests are conducted to investigate influences of bed sediment size on erosion rate by supplying debris flows having unsaturated sediment concentration over erodible beds. Experimental results show that the erosion rate decreases monotonically ...