Experimental study of the velocity profile of rill in the loess region
The flow velocity distribution under the condition of steep slope (20°) is studied by using the method of indoor fine simulated rainfall experiment.Through the observation and analysis of the rill morphology evolution and the overland flow velocity during the experiment,the variation rule of the flow velocity during the rill formation and development was studied.The results show that the overland flow velocity between the rills is not affected by the degree of rill development,but there is a relationship between the flow velocity within the rill and the rill development.First,the emergence of the rill will lead to an increase of runoff in the rill,but with the rill development,the confluence area decreases,the rill bed morphological resistance increases,resulting in the gradual decrease of the rill flow velocity.The reciprocal contrast between the rill bed morphological resistance and the flow velocity increment caused by runoff concentration affects the flow velocity in the rill.
国家科技期刊平台
NSTL
万方数据
维普
