Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34466
標題: 應用DEM萃取集水區水系門檻值變異與影響因素之探討
Variation and Influential Factors for Watershed's Stream Network Threshold Values Extracted from DEM
作者: 許家豪
Hsu, Chia-Hao
關鍵字: Flow accumulation
累積流量
Dynamic automatic watershed delineation
Stream threshold
集水區動態萃取
水系門檻值
出版社: 水土保持學系所
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摘要: Abstract With the progress of computer technology, the technique of using digital elevation model (DEM) data to automatically delineate a watershed and then extract its stream network have become more mature. The spatial distribution of stream network derived from the threshold is based the concepts of on flow accumulation. The value of the threshold depends on the characteristics of the landform and/or climatic condifions of a watershed.Dynamic automatic watershed delineation method and the multi-threshold algorithms for extracting watershed stream network were employed in this study. Length of main stream, width of watershed, length of total streams, the amount of streams, the density of stream network and the frequency of streams are adopted to analyze the range of threshold for watersheds by trial-and-error method. The range of threshold variances the each watershed is different, and the influential factors of threshold include rainfall, altitude, slope and geological compressive strength. The results demonstrate that threshold variances relate to rainfall and geology apparently. Sub-watersheds are also chosen to analyze by means of regression analysis. The result shows that slope is also relate to threshold variances except rainfall and geology compressive strength. Dynamic automatic watershed delineation method and multi-threshold algorithms for extracting watershed stream network are commended in this study. The module developed in this study can be effectively used for watershed planning and evaluation.
摘要 隨著電腦科技之不斷進步,數位高程模型(DEM)資料應用於集水區水系網之萃取技術已臻成熟。惟現階段集水區水系網之萃取仍多以累積流量之門檻值來進行,而門檻值之大小又常由地文特性及氣候因素所決定,對於較大之集水區,若僅由單一門檻值進行水系網之萃取,可能難以真實反映集水區實地之水系網的分布。本研究以試誤法由主流長度、集水區寬度、河川總長度、河川數量及水系密度等6種地文因子,分析基隆河、石門水庫、陳有蘭溪、曾文水庫及二仁溪集水區之適用之水系門檻值的範圍,並推估其合適值。由於各集水區水系門檻值範圍均不相同,經以雨量、高程、坡度及地質單壓強度進行分析,並探討其影響門檻值之變異範圍。 初步結果顯示集水區雨量及地質與門檻值之變異間具有高明顯之相關性。另分別利用各區之子集水區增加集水區樣本數,顯示各集水區水系門檻值變異與坡度變異有明顯關係,可知集水區坡度變異越大,其水系門檻值變異也越大。 大面積集水區水系門檻值受各種因素影響甚難取得合適之單一值,宜以多重水系門檻值進行萃取之水系較為合理,可獲得較精確之集水區水系網。
URI: http://hdl.handle.net/11455/34466
其他識別: U0005-2808200616294900
Appears in Collections:水土保持學系

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