水利学报2017，Vol.48Issue(5)：568-575,8.DOI:10.13243/j.cnki.slxb.20160691
沟道截断对分布式土壤侵蚀学坡长提取的影响
Effect of channel networks cutoff on extraction of distributed erosion slope length
摘要
Abstract
Topographic is one of the important factors affecting soil erosion.Distributed soil erosion slope length is an important parameter to evaluate terrain.Associated with erosion process,accumulation of distributed soil erosion slope length should be stopped once cut off by channel.Channel head position is difficult to define,so threshold is always used to estimate channel networks.It is necessary to study the impacts of channel networks and different thresholds on slope length,and find the way to set a reasonable threshold in the case that the actual channel head cannot be determined.In this paper,the DEM data of Xiannangou and Jiuyuangou catchments in the Loess Plateau are used to extract slope length under different thresholds.The results show that the impact of channel cutoff on the maximum slope length is greater than that on the averages of the extracted slope length,and the impact of the different thresholds on the slope length is greater than that of the different areas.The threshold of channel cutoff in Loess Plateau area can be set as 4％ of the average value of the slope length.关键词
土壤侵蚀/通用水土流失方程/地形因子/侵蚀学坡长/沟道截断Key words
soil erosion/USLE/topographic factors/distributed erosion slope length/channel cutoff分类
农业科技引用本文复制引用
张宏鸣,杨勤科,王猛,晋蓓,王雷,李锐..沟道截断对分布式土壤侵蚀学坡长提取的影响[J].水利学报,2017,48(5):568-575,8.基金项目
国家自然科学基金项目(41301283,41371274,41301507) （41301283,41371274,41301507）
欧盟地平线2020研究与创新计划(GA:635750) （GA:635750）
黄土高原土壤侵蚀与旱地农业国家重点实验室基金(A314021402-1702) （A314021402-1702）
