摘要
为了给黄土塬区沟谷侵蚀研究和固沟保塬工程建设提供参考,利用高分辨率谷歌影像,目视解译董志塬地区的沟谷沟沿线,基于沟沿线特征构建沟谷发育度、逼近距离、边界维数等量化指标,分析董志塬沟谷侵蚀发育规律,并对其影响因素进行了分析。结果表明:董志塬地区沟谷发育度总体上北部大于南部、东部大于西部,由北向南、由西向东的分布均呈先减小后增大的格局,其中北部地区最大值接近于1,表明北部区域塬面几乎被蚕食殆尽;董志塬地区逼近距离即沟沿线与流域分水线的平均距离的分布由北向南、由西向东均呈先增大后减小的格局,在中部地区出现约2500 m的最大值,北部地区的最小值小于60 m,表明北部地区小流域沟谷侧蚀程度较高;董志塬地区边界维数的分布由北向南、由西向东均呈先减小后增大的格局,北部地区出现约1.8的最大值,表明北部地区沟沿线形态复杂,中部地区最小值接近1,说明中部地区沟谷发育程度较低;董志塬地区沟谷侵蚀发育受地形地貌、地质构造、植被、降雨等自然因素的影响。
In order to provide references for gully erosion and related research in the loess area and the construction of gully protection projects,the high-resolution Google image was used to visually interpret the network shoulder line of the valley in Dongzhiyuan area,and based on the characteristics of the gully,a quantitative index system such as gully development rate,approaching distance and boundary dimension was constructed to quantitatively analyze the distribution and distribution of the gully erosion in Dongzhiyuan.The influencing factors were analyzed.The results show that the development degree of gullies in Dongzhiyuan area is generally greater in the north than that of in the south and greater in the east than that of in the west.The distribution from north to south and west to east all show a pattern of first decreasing and then increasing.The maximum value in the northern region is close to 1,indicating that the plateau in the northern region has been almost eaten away.The approaching distance of Dongzhiyuan area which is the distribution of the average distance between the network shoulder line of valley and the watershed line from north to south,and from west to east,shows a pattern of increasing first and then decreasing.In the central region,the maximum value is about 2500 m,while in the northern region,the minimum value is less than 60 m,indicating a high degree of lateral erosion in gully of small watershed in the northern region.The distribution of boundary dimension in Dongzhiyuan area decreases first and then increases from north to South and from west to east.The maximum value of 1.8 appears in the northern region,which indicates that the shape of the gully is complex in the northern region and the minimum value is close to 1 in the central region indicating that the gully development in the central region is relatively lower.The development and distribution of gully erosion in Dongzhiyuan area is affected by topography,geological structure,vegetation,rainfall and other factors.
作者
王崔林
许强
寇平浪
赵宽耀
邹锡云
杜鹏川
WANG Cuilin;XU Qiang;KOU Pinglang;ZHAO Kuanyao;ZOU Xiyun;DU Pengchuan(State Key Laboratory of Geohazards Prevention and Geoenviroment Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《人民黄河》
CAS
北大核心
2021年第11期109-115,共7页
Yellow River
基金
国家自然科学基金重大项目(41790445)。
关键词
沟蚀
沟沿线
沟谷发育度
逼近距离
边界维数
董志塬
gully erosion
network shoulder line of valley
gully developmental rate
approaching distance
boundary dimension
Dongzhiyuan
