摘要
基于人工模拟降雨研究三峡库区径流小区在大雨强下产流产沙对15°,25°两种坡度的响应特征.结果表明:在降雨过程中,产流时间随着坡度的增加而变短.径流流速随着产流历时的增加,先增加,后减小.径流量随着产流历时的增加而增大,且坡度越大其值越大.在产流过程中径流携带的侵蚀泥沙量呈现先陡增、再陡降,最后趋于稳定的现象,25°坡度下侵蚀泥沙量峰值较大,峰值出现时间也相应提前.建立径流流速与侵蚀泥沙量的回归模型,15°坡度下径流流速随着侵蚀泥沙量的增加而减小,25°坡度下径流流速随着侵蚀泥沙量的增加而变大.
The response characteristic of runoff and sediment production in runoff plots in the Gorges Res-ervoir at large stimulated rainfall intensity has been studied based on two different slopes which are 1 5°and 25°.The results show that the time producing runoff becomes short with the increase of slope during rain-fall process.With runoff duration runoff velocity increased and then decreased,runoff amount increases continuously which the greater slope caused the larger value.During runoff process the quantity of runoff sediment increases firstly and reduces gradually and tends to be stable,and the peak of quantity of sedi-ment filled out with the increase of slope and constantly the time of peak advances.Modeling runoff veloci-ty and erosion sediment yield,in 15°runoff velocity decreases with increase of erosion sediment yield and becomes large in 25°.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第3期131-135,共5页
Journal of Southwest China Normal University(Natural Science Edition)
基金
中央高校基本科研业务费专项资金资助(XDJK2011C013)
国家科技支撑计划项目(2011BAD31B03)
西南大学博士基金项目(SWU110023)
西南大学生态学重点学科"211"工程建设经费资助项目
关键词
人工模拟降雨
紫色土
径流小区
产流产沙
simulated rainfall
purple soil
runoff plot
runoff and sediment production
