利用REE示踪法分析坡面放水冲刷的侵蚀过程  

Soil Erosion Process of the Slope Scouring with REE Tracer Method

作　　者：王瑄[1] 李占斌[2] 尚佰晓[1] 

机构地区：[1]沈阳农业大学水利学院,沈阳110161 [2]西安理工大学水资源研究所,西安710048

出　　处：《沈阳农业大学学报》2008年第2期218-222,共5页Journal of Shenyang Agricultural University

基　　金：国家自然科学基金资助项目(40371075);辽宁省自然科学基金项目(20062110)

摘　　要：为确定放水条件下坡面侵蚀规律,采用3个坡度(15°,18°,21°)和3个流量(3.5,4.5,5.5L·min-1)交叉组合进行室内冲刷试验,并利用REE示踪法系统分析细沟发生和发展过程。结果表明:坡面上部细沟侵蚀最为剧烈,到试验结束时,坡面上部、中部和下部的沟蚀深度分别在20cm、10cm和5cm的范围内;上部和中部各层稀土元素示踪区的侵蚀率在试验过程中的变化曲线呈现单峰型或多峰型。流量对各元素示踪区侵蚀率的影响比坡度更为显著,是影响细沟侵蚀量的主要因素。水流流量不变时,在试验初始3min内,坡度对坡面下部的侵蚀影响相对较大。To confirm the soil erosion process of the slope scouring, the runoff scouring experiment was applied with three slope gradients （15°,18°and 21°） and three discharges（3.5, 45 and 5.5L·min^-1）by cross and build-up way, and with REE tracer method the occurrence and development processes of interrill was analysed systematically. The results showed that the rill erosion depth of the upper, middle and lower of slope was in the range of 20cm, 10cm and 5cm respectively. The erosion ratio lines of differ- ent REE tracing areas of upper and middle of slope showed single or multiple peaks. The erosion ratios of different REE tracing areas were affected by discharge more significantly than slope gradient, so discharge was the main factor that affected rill erosion yield. During the initial three minutes of the experiment ,the angle of slop had more significantly impact on the erosion of lower part of slop while the current was constant.

关 键 词：REE示踪法 冲刷 细沟侵蚀 侵蚀率 坡面 

分 类 号：S157.1[农业科学—土壤学]