ISWC OpenIR  > 水保所知识产出(1956---)
沟道截断对分布式土壤侵蚀学坡长提取的影响
张宏鸣1; 杨勤科2; 王猛1; 晋蓓1; 王雷2; 李锐1,3
2017
Source Publication水利学报
Volume48Issue:5Pages:568-575
Abstract

地形是影响土壤侵蚀的重要因子,分布式土壤侵蚀学坡长是地形因子的重要参数。坡长与侵蚀过程相关,
且受地形影响较大,在提取过程中,遇到沟道截断,坡长不再累计。由于沟头位置较难确定,通常沟道提取采用
设置一定的汇水面积阈值来实现。然而,沟道对坡长提取结果的影响、不同阈值对坡长提取结果的影响、在无法
确定沟头位置情况下如何更加合理地设置截断阈值等问题, 亟待研究。本文以黄土高原县南沟和韭园沟流域
DEM 为数据源,对沟道引起的坡长截断进行对比分析。结果表明,沟道截断对坡长提取的平均值影响小于对坡
长最大值的影响;不同区域对坡长的影响小于阈值设置的影响;黄土高原地区的沟道截断阈值可参考平均坡长降
低的变化率为4%来设定。

Other 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 distrib⁃
uted 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 Xiannan⁃
gou and Jiuyuangou catchments in the Loess Plateau are used to extract slope length under different thresh⁃
olds. 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.

Keyword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
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8498
Collection水保所知识产出(1956---)
Affiliation1.西北农林科技大学
2.西北大学城市与环境学院
3.中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
张宏鸣,杨勤科,王猛,等. 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.
APA 张宏鸣,杨勤科,王猛,晋蓓,王雷,&李锐.(2017).沟道截断对分布式土壤侵蚀学坡长提取的影响.水利学报,48(5),568-575.
MLA 张宏鸣,et al."沟道截断对分布式土壤侵蚀学坡长提取的影响".水利学报 48.5(2017):568-575.
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