Experimental Research on Hydraudynamic Characteristics of Loess Slope

摘要

The change of soil erosion amount and runoff amount are accordant in different wash flow on slope, they are increasing with wash flow growth. The amount of soil erosion got stable equilibrium when the experiment continue 18 min, the stable equilibrium soil erosion amount are near between 5 L/min and 7. 5 L/min, it' s 3 times of 3 L/min and 20 times of 1 L/min. The runoff of 20° and 30° slope could carry larger amount of sediment than 10° slope' s runoff. The runoff energy consumption is very distinct in different flow, the runoff energy consumption is about 16. 65 J/min on 1 L/min flow condition, it' s 1/3 of 3 L/min, 1/5 of 5 Umin ,1/8 of 7. 5 L/min. The runoff energy consumption is larger at initial experimental stage, and then decrease with time. The unit stream power of the slope are increase at the beginning and then reduce to a undulate steady state with time in different wash flow amount, the steady value is about 0. 15 m/s, The unit stream power of the slope increases with the slope gradient.