Using the Coding for Separately Random Fractal Patterns to Simulate River Characteristics and Analysis of the Impacts of Land Use Changes on Rainfall-Runoff Processes
Date Issued
2005
Date
2005
Author(s)
Sung, Wen-yuan
DOI
zh-TW
Abstract
The purpose of this study is to utilize fractal theory includes characterized by self affinity and invariance to scale constructing shapes and features of river networks. By using random generation of fractal, the pattern, length, watershed’s area, slope of river network can be created easily. Random generate process will cause the results of fractal pictures be highly varied, for this reason a brand-new coding method is applied. This mode will derive shapes and features of river networks effectively.
To analyze the impacts of land use changes on rainfall-runoff process, different fractal basic patterns are applied to simulate omnigenous terrain features or developments. Finally, Wu-tu watershed is selected to verify suitability of this model.
The results suggest when change occurs in fractal basic patterns or terrain’s parameters like: shorten main stream length, diminish watershed’s area, increase slope, enlarge probability of fractal generation, and decrease Mannning’s coefficient will all advance the time of concentration and grow in quantity of flood peak. In contrast to the above-mentioned factors, Mannning’s coefficient of overland, slope and main stream length have more effect than watershed’s area and Mannning’s coefficient of channel. Appling the model in Wu-tu watershed reveals this model only need to determine the fractal basic pattern of watershed and collect some informations of terrain features, then it can simulate the rainfall-runoff process effectively and quickly. This model is of great use to a project watershed with insufficient data.
Subjects
隨機碎形生成
編碼
河川特性
土地利用改變
random generation of fractal
coding
features of river networks
land use change
SDGs
Type
thesis
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