摘要
为深入了解砒砂岩坡面的侵蚀产沙特征,在野外建立了人工原状砒砂岩坡面,通过放水冲刷试验对比研究了白色和红色原状砒砂岩坡面的产流、产沙过程。结果表明:白色砒砂岩坡面水分入渗率为18.9 mm/h,小于红色砒砂岩坡面的47.0 mm/h;白色和红色原状砒砂岩坡面水流平均流速与流量呈幂函数关系,相同冲刷流量条件下红色砒砂岩较白色砒砂岩产沙量及坡面水流含沙量大、抗侵蚀性弱;受水分入渗率和砒砂岩颗粒分离速度的控制,两种坡面土壤剥蚀率与单宽流量之间呈向下弯曲的二次曲线关系;两种砒砂岩坡面土壤剥蚀率与水力学参数的相关关系相似,说明其侵蚀产沙的水力学机制是一致的。
In order to improve understanding of the erosion characteristics on the sandstone slopes, two undisturbed sandstone slopes of the red and white colors were made, and the processes of runoff and sediment yield on the two kinds of slope were studied through field experiments. The results show that water infiltration rate on the white undisturbed sandstone slopes is 18.9mm/h, which is lower than that of the red one 47.0 mm/h. There are power function relations between the average flow velocity and supply water intensity on the slopes. It has larger sediment yield and weaker erosion resistance ability on the red undisturbed sandstone slope than that of the white one. Controlled by the rate of water infiltration and the separation speed of the sandstone particles, soil detachment rate and flow rate per unit width have the relation of＇ quadratic curve function bent downwards. There are similar correlations between soil detachment rate and hydraulic parameters on the two kinds of undisturbed sandstone slope, which shows that the hydraulic mechanisms of sediment yield are essentially consistent.
作者
杨吉山
姚文艺
郑明国
申震洲
刘慧
YANG Jishan YAO Wenyi ZHENG Mingguo SHEN Zhenzhou LIU Hui(Key Laboratory of Sediment Yield Process and Control on the Loess Plateau of MWR, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China Institute of Geographic Sciences and Natural Resources, CAS, Beijing 100101, China)
出处
《人民黄河》
CAS
北大核心
2017年第1期98-101,109,共5页
Yellow River
基金
国家自然科学基金资助项目(41271306
41201267)
国家"十二五"科技支撑计划项目(2013BAC05B01)
国家重点研发计划项目(2016YFC040240205)
关键词
砒砂岩
侵蚀产沙
土壤剥蚀率
试验研究
undisturbed sandstone
erosion and sediment yield
soil detachment rate
experimental study
