數值地型資料應用於集水區區劃和河川網路分析之研究

Application of Digital Terrain Data to Topographic Partition of Watershed and Analysis of Stream Network

鄭祈全(Chi-Chuan Cheng)

《林業試驗所研究報告季刊》 8卷4期 (1993/12) Pp. 331-343

https://doi.org/10.7075/BTFRI.199312.0331

摘要

本文旨在探討數值地型資料應用於集水區區劃和河川網路分析之可行性，並建立林地分級所需之分級單元與部分河川網路資訊，供未來林地分級之參考。研究方法係應用數值地型資料，配合影像處理技術，自動粹取河川網路與集水區單元，並比較人為與自動粹取之差異，同時分析河川網路特性，研究結果顯示，數值地型資料應用於集水區區劃，可自動地粹取林地分級所需之分級單元和部分河川網路資訊，較人為粹取節省人力與時間，且不易受人為所影響，同時可有效地分析各分級單元之河川網路特性，如河川密度、河川分歧率、河川頻率等，故確為一可行的方法，惟應用數值地型資料自動粹取之關鍵決定於河川出水口與河川支流密度之選定。

關鍵字

數值地型資料 ； 集水區區劃 ； 河川網路 ； 林地分級

並列摘要

The objective of this study is to investigate the possibility of applying digital terrain data to topographic partition of watershed and stream network and also to establish forest-land classification unit and partial hydrological information for the near application of Tawian forest land classification. The research process was to utilize digital terrain data to automatically extract the stream network and subwatershed by image processing techniques. The stream network was also analyzed. Meanwhile, the results obtained from automatic extraction and manual extraction had been compared.
The result indicates that the application of digital terrain data to topographic partition of watershed can automatically extract the classification units and establish the partial information of stream network. It is better than manual extraction because of saving manpower and time, and also it is not influenced by manual. Meanwhile, it can effectively analyze the stream network of classification units such as stream density, bifurcation ratio, stream frequency etc. Therefore, it is a feasible approach. However, the keypoint of automatic extraction depends on the selection of stream outlet and tributary density.

並列關鍵字

Digital terrain data ； topographic partition of watershed ； stream network ； forest land classification