The extraction and quantitative analysis of channel junctions based on DEMs

摘要：

Channel junctions are the intersection points of different gullies in a drainage area.Base on DEM data and GIS process,an effective extraction method of channel junctions is proposed at first in this paper.Then with the definition of channel junction density being introduced,the rationality and validity that it is used to describe erosion intensity at macro-scale is explored.Meanwhile,the quantitative difference of channel junction density in the Loess Plateau in North Shaanxi Province of China is analyzed.The experiment results show that there is a strong correlation of channel junction density and gully density.Moreover,channel junction density keeps more sensitive than gully density when proper threshold values are applied at different grid resolution scales.In addition,channel junction density and the loess landform types correlate intensively,which reveals the great potential significance of channel junctions on geomorphology research.At the same time,the variations of channel junction density at different order levels in the typical watersheds are discussed.So,the research is hopeful in deepening our understanding on landform characteristics and evolutions of the Loess Plateau.

关键词： channel junctions channel junction density hydrology erosion

作者: Youfu Dong Guoan Tang Mingliang Luo

作者单位: Key laboratory of Virtual Geographic Environment (Nanjing Normal University),Ministry of Education,N Key laboratory of Virtual Geographic Environment (Nanjing Normal University),Ministry of Education,N Key laboratory of Virtual Geographic Environment (Nanjing Normal University),Ministry of Education,N

会议类型: 国际会议

会议名称: 第16届国际地理信息科学与技术大会(16th International Conference on GeoInformatics and the Joint Conference)

会议地点: 广州

会议语种:英文

在线出版日期: 2008-06-28（万方平台首次上网日期，不代表论文的发表时间）