摘要
在研究天然降雨特性的基础上,对人工模拟降雨特性进行了研究分析。从能量的角度入手,研究了模拟降雨条件下,坡面产流产沙的分布规律。研究结果表明:人工模拟降雨降雨动能与天然降雨动能不同,其降雨动能与降雨强度呈明显的线性关系,降雨强度是调控降雨动能的最好参数;降雨侵蚀产沙过程是降雨动能对土壤表层做功的过程,降雨动能直接决定了产沙量的大小,尤其是在降雨前期,降雨动能对产流产沙的影响现象十分明显;降雨中后期,降雨动能对产沙量的影响减弱,其机理有待进一步研究。
Based on the study of natural rainfall characteristics,the characteristics of simulated rainfall are studied and analyzed.The runoff and sediment distribution rule of slope under simulated rainfall is studied from the angle of energy.The results indicate that the kinetic energy of artificial rainfall is different from that of natural rainfall in simulation.It has linear relationship with rainfall intensity,which is the best parameter for controlling the kinetic energy of rainfall.The process of rainfall erosion and sediment is the process that kinetic energy of rainfall acts on the surface of soil.The rainfall kinetic energy directly determines the size of the sediment yield,especially in the earlier rainfall.The influence of kinetic energy of rainfall on runoff and sediment phenomena is very obvious.The influence of rainfall kinetic energy on sediment yield is abated during the middle and late period of rainfall and its mechanism needs further research.
出处
《节水灌溉》
北大核心
2011年第6期44-47,共4页
Water Saving Irrigation
基金
国家自然科学基金资助项目(40871133)
国家重点基础研究发展"973"计划(2007CB407201)
关键词
模拟降雨
降雨强度
降雨动能
产流
产沙
simulated rainfall
rainfall intensity
kinetic energy of rainfall
runoff
sediment
