论文部分内容阅读
以陕西杨凌周边开发建设项目弃土堆积体表层土壤为试验材料,模拟野外最常见的散乱锥状堆积体的形成过程和堆置形态。在室内模拟降雨的条件下,设计了七组降雨强度(1.0、1.25、1.5、1.75、2.0、2.25、2.5mm/min),研究了雨强对物质组成为全土的锥状工程堆积体的产流产沙规律和细沟发育的影响。结果表明:1降雨强度对径流率和侵蚀速率的变化规律有着显著的影响,在不同的降雨条件下,径流率和侵蚀速率随时间的变化规律不同;2各雨强条件下,细沟长度、宽度和深度的变化趋势不同,其中细沟长度与侵蚀速率之间存在着显著的正相关关系;3在产流初期(0~10 min),侵蚀速率随雨强的增大呈现出一条较为平缓的曲线,产流时间>10 min后,侵蚀速率随雨强的增大呈现出指数增大的趋势;4总侵蚀量与雨强之间存在着明显的指数关系。
Taking the surface soil of the abandoned earthwork in the development and construction project around Yangling in Shaanxi as the experimental material, the forming process and the stacking pattern of the most common scattered conical sediments in the field were simulated. Under the condition of indoor simulated rainfall, seven groups of rainfall intensities (1.0,1.25,1.5,1.75,2.0,2.25,2.5mm / min) were designed to study the effects of rainfall intensity on the conical engineering stack with the whole composition of soil Effects of Abstraction Sediment and Rill Development. The results show that: (1) rainfall intensity has a significant effect on the variation of runoff rate and erosion rate. Under different rainfall conditions, the variation of runoff rate and erosion rate with time are different. Under each rainfall intensity condition, There was a significant positive correlation between the length of the rill and the erosion rate. (3) During the initial runoff (0-10 min), the erosion rate showed a relatively gentle with the increase of rainfall intensity , The erosion rate increases exponentially with the increase of rainfall intensity after the runoff time> 10 min. 4. There is a clear exponential relationship between the total erosion and the rainfall intensity.