The drainage channel with step-pool configuration

which is one of debris flow drainage works and is used in gully with steep gradient

has a good potential application because of its high-performance control effect and engineering value.In order to explore the characteristics of debris flow in a drainage channel with step-pool configuration

debris flow bulk density

scale and depth of step-pool configuration are selected as the main affecting factors and a series of flume experiments are carried out.Debris flow pattern

time-averaged depth and a phenomenon of interchange of materials were investigated along with the characteristics of energy dissipation in this paper.According to the experimental results

the phenomenon was most intense when debris flow with 17 kN/m3 passed through a drainage channel than the other two.And the energy dissipation is mainly shown in the aspects of flow depth changing and turbulence intensifying.The analysis also indicates that the ratio of energy dissipation increased as depth of step-pool configuration increased and was more than 20% basically.The maximum observed ratio of energy dissipation was 73.93%in the experiment where debris flow bulk density was 14 kN/m3

scale was 0.5 m3 and depth of step-pool configuration was 30 cm.However

the step-pool configuration with overlarge depth performed evident trapping sediment which contraries the purpose of transporting sediment.Besides

the energy dissipation decreased with the debris flow scale

which had fewer effect than the other two factors.