摘要
在延安市燕儿沟小流域自然坡地上,采用野外放水冲刷实验,初步分析自然坡面耕作对浅沟侵蚀产流产沙特征的影响。结果表明：无耕作小区的径流率、径流含沙量、产沙率较有耕作小区分别增加3%-21%,75%-243%和47%-305%。在有无耕作处理小区,产沙量与水流剪切力均呈线性相关,产生侵蚀的临界剪切力分别为1.61Pa和1.30Pa。
In this paper,the effect of tillage on ephemeral gully erosion runoff and sediment rate along with the relationship between flow shear force and sediment yield were tentatively analyzed quantitatively by water discharge scouring experiments with the designed discharge 10,15,20,25L/min on the natural slope of 18.5°in fields in yan＇er gully watershed of Yan＇an.Results indicated that the flow rate,runoff sediment concentration and sediment yield rate of tillage plot increased by 3%-21%,75%-243% and 47%-305% respectively,compared with the not tillage plot.Under different designed discharge,there was a linear correlation between flow shear force and sediment on tillage plot,the critical shear force to produce sediment was 1.61Pa and 1.30Pa.
出处
《水土保持学报》
CSCD
北大核心
2013年第5期32-36,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(40411080)
中国科学院教育部水土保持与生态环境研究中心“十二五”重大突破项目“黄土丘陵区退耕还林后土壤溯源侵蚀过程研究”
黄土高原土壤侵蚀与旱地农业国家重点实验室专项(10502-T1)
关键词
黄土丘陵区
浅沟侵蚀
水流剪切力
耕作
loess hilly-gully region
ephemeral gully erosion
flow shear force
tillage
