Shyue-Cherng Liaw,Chiung-Piau Huang,Shen-Chung Chi.A Study of the Extraction of Channel Networks from Digital Terrain Model in Upstream Forested Watersheds[J].Research of Soil and Water Conservation,1999,6(03):2-8.
应用数值地形模型萃取上游森林集水区河川网路之研究
- Title:
- A Study of the Extraction of Channel Networks from Digital Terrain Model in Upstream Forested Watersheds
- Keywords:
- threshold area; ratio of stream length; ratio of stream area
- 摘要:
- 应用数值地形模型萃取河川网路时，面积门槛值常会影响到河川网路萃取结果，改变河川网路密度。本文旨在探讨不同的面积门槛值对上游陡坡森林集水区河川网路萃取之影响，以台湾南部中寮溪及扇平溪集水区为研究对象。结果显示，河流级序、支数及长度均随面积门槛值增加而减少，河溪数目比、河溪长度比及河溪面积比与面积门槛值无明确趋势可循，变动范围较大。排水密度与河川频率则随面积门槛值增加而减少，成幂函数关系递减，其相关判定系数（R2）介于 0.96～0.99。经由现场调查与萃取出之河川网路相互比对后，建议以 12.8hm2左右作为研究区域内丰水期时河川网路萃取之面积门槛值，但在枯水期时，则以 25.6hm2左右作为河川网路萃取之面积门槛值。
- Abstract:
- When extracting stream networks from a digital terrain model (DTM),the thresh-old area is used to determine the density of stream networks,and it is an important factor that it often has great influence on the results. It evaluates the effects of different threshold areas on the extraction of stream networks in upstream forested watersheds. The Chung-liao stream and Shan-ping stream watersheds are chosen as the study areas. Results reveal that the stream order,stream number,and stream length decrease as the threshold area increases. These ratios of stream num ber,stream length,and stream area vary in wide range,which have not clear relationship with the threshold area. In addition,the stream density and stream frequency decrease as the threshold area increases based on the power function,and the coefficients of determination were between 0.96 and 0.99. Through field investigation,it was suggested to use around 12.8hm2 as the threshold area to extract channel networks from DTM in study areas during wet season. However,the threshold area 25.6 hm2,was suggested for dry season.
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备注/Memo
收稿日期:1999-6-1;改回日期:。作者简介:廖学诚：台湾林业试验所集水区经营系助理研究员。黄琼，王彪：台湾林业试验所集水区经营系研究员兼系主任。漆升忠：台湾林业试验所集水区经营系副研究员兼秘书。