Erosion processes on red soil slope in south China under simulated rainfall system
Storm rainfall and water flushing are two major factors on red soil erosion processes in South China. It is very important for us to build a physical erosion model that analyzing erosion flow hydraulics on red soil slope in South China under simulated rainfall condition. Flume experiments with seven rainfall intensities (30, 60, 90, 120, 180, 210, 270 mm·h-1), five slope gradients (5°, 10°, 15°, 20°, 25°), and total 35 times experiments were conducted to evaluate their interaction effect on runoff and sediment on such soil slope in the laboratory. Results indicated that rainfall intensity and slope angle play important roles on runoff and sediment transport. Both runoff generation and sediment yield are fluctuated processes changes with time. Runoff rate fluctuated heavy at the stage of duration changes from 0 to 15 min, and keep a relatively stable stage after 15minutes later for all experiments. There is a good relationship between runoff amount and rainfall intensity. Runoff amount increases as rainfall intensity increases. The rainfall intensity is higher and the sediment load under steady condition is larger. When the rainfall intensity is 30 mm·h-1, although we change slope gradients from 5° to 25°, there is only runoff generation and no sediment yield for all experiments.
国家科技期刊平台
NSTL
万方数据
维普
