摘要
在不同层面对研究区数字高程模型(DEM)重分级,探讨地形因素对侵蚀沟发育的影响。以第一次全国水利普查侵蚀沟普查成果(2010年)与辽宁省第五次土壤侵蚀普查侵蚀沟普查成果(2015年)获取侵蚀沟分布数据,基于1∶50 000DEM获取侵蚀沟高程、坡度、坡向、坡长和空间分异特征。在地理信息系统(GIS)和遥感(RS)技术的支持下,分析辽宁省侵蚀沟发育特性与地形分异特征。结果表明:5年间研究区侵蚀沟密度增加0.02km/km^2,侵蚀沟高发区主要集中在辽西;70%以上区域密度变化值<50m/km^2,大部分处于微度增加区;高程在325~350m时密度变化值最大;坡向上南坡、西南坡为密度变化高值区;坡度在1.5°~15°时密度变化曲线呈抛物线形,<1.5°和>15°时无明显变化;坡长在600~800m时密度变化值最大,坡长>1 000m时密度变化值无明显差异。
In order to explore the influence of topographic factors on the development of erosion gully,regrading Digital Elevation Model（DEM）at different levels was conducted in the study area.The erosion gully distribution data were obtained from the results of the Erosion Gully Census in the First National Water Resources Census（2010） and the results of the Erosion Gully Census in the Fifth Soil Erosion Census In Liaoning Province（2015）.Erosion gully elevation,slope,slope aspect,slope length and space differentiation were based on the 1∶50 000 DEM.This study analyzed the characteristics of erosion gully development and topographic differentiation in Liaoning province of China with the supported of geographic information system（GIS） and remote sensing（RS）technology.The results showed that the erosion gully density increased 0.02km/km^2 in the study area within 5 years, and the erosion gully mainly concentrated in the western Liaoning.The change value of the erosion gully density were less than 50m/km^2 in more than 70% of the study area,most of them were in the micro enhancement zone.The change value of density was maximum when the elevation was between 325 m and 350m.The change values of density of the south slope and southwest slope were the maximum.When the slope was between 1.5° and 15°,the graph of change density was parabolic, and there was no obvious change when the slope was less than 1.5° and more than 15°.The density change was the maximum when the slope length was between 600 m and 800m, and there was no significant difference in density change when the slope length was more than 1 000 m.
作者
黄萌
范昊明
HUANG Meng FAN Haoming(College of Water Conservancy, Shenyang Agricultural University, Shenyang 110866)
出处
《水土保持学报》
CSCD
北大核心
2017年第5期93-98,共6页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目"东北黑土低山丘陵区融雪侵蚀机理与过程研究"(41371272)
关键词
土壤侵蚀
侵蚀沟地形分异
地理信息系统
侵蚀沟密度
soil erosion
topographic differentiation of erosion gully
geographic information system
gully density
