Characteristics analysis and process modeling of runoff yield on the slope of highway construction dump yard
Modeling of the runoff process on the slope of highway dump yard plays an important role in watershed water resources assessment and road erosion model construction. In this study, a series of different intensity rainfall processes (0. 6 ~2. 79mm/min) are designed and implemented in the lab, and are used t& simulate the runoff processes occurred on the different slopes (sloping gradients ranging from 19. 4% ~78. 1% ) of highway dump yard as well as its temporary construction road (with a slope of 30.6% ). The runoff processes are also simulated by the Green-Ampt ( GA) infiltration model. The modeling results show that, when the rainfall intensity is at a low level (such as 0.6mm/min) , the runoff yield is significantly affected by the soil dry bulk density and plot sloping gradient; and the effects of dry bulk density and sloping gradient on the runoff yield decrease gradually with the increase of the rainfall intensity. The results also show that the runoff process on the slope of highway dump yard could be accurately predicted by the Green-Ampt infiltration model, with a correlation coefficient of 0.975, particularly when the rainfall intensity is high.
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万方数据
维普
