摘要
浅沟通常发生在黄土高原地区陡坡农耕地上,是黄土高原丘陵沟壑区一种独特的微地貌现象,影响着坡面降雨产汇流过程和侵蚀产沙数量。以黄土丘陵沟壑区坡面浅沟为研究对象,通过野外典型浅沟径流小区放水冲刷试验,研究上方来水对浅沟侵蚀产沙及输沙规律的影响。结果表明:浅沟径流率随着上方来水流量的增大而不断增大;产沙率随着上方来水流量的增大而增大。含沙量大小顺序为上方来水流量15L/min,下方水流量10L/min时含沙量>上方来水流量10L/min,下方水流量10L/min时含沙量>无上方来水,下方水流量10L/min时含沙量>上方来水流量5L/min,下方水流量5L/min时含沙量>无上方来水,下方水流量5L/min时含沙量。有上方来水比无上方来水含沙量增大1.39～2.46倍。
The ephemeral gully was on steep slopes farming land in the Loess Plateau,it is a unique micro-landforms,affecting the area during rainfall runoff and erosion sediment volume.This paper takes the Loess Plateau as research object,from small area runoff experimental study following conclusions is made.Effects of sand sediment and law of sediment transport by runoff from upslope were studied.The results show that the runoff ratio,sand sediment of ephemeral gully increased with the increasing upslope runoff rate.sediment concentration size order is： When runoff from upslope was 15 L/min,downslope flow rate was 10 L/min runoff from upslope was 10 L/min,downslope flow rate was 10 L/min without runoff upslope and downslope runoff flow rate was 10 L/min runoff from upslope was 5 L/min,downslope flow rate was 5 L/min without runoff upslope and downslope flow rate was 5 L/min.The sediment concentration of runoff will increase by 1.39~2.46 times with runoff from upslope than without runoff upslope water current.
出处
《水土保持学报》
CSCD
北大核心
2012年第3期49-52,共4页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(40471080)
黄土高原土壤侵蚀与旱地农业国家重点实验室科研专项(10502-T1)
关键词
浅沟
产沙
上方来水
野外冲刷试验
ephemeral gully
sediment yield
upslope runoff
erosion experimental on field
